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Estimating penetration-related X-band InSAR elevation bias: a study over the Greenland ice sheet
(2019)
Accelerating melt on the Greenland ice sheet leads to dramatic changes at a global scale. Especially in the last decades, not only the monitoring, but also the quantification of these changes has gained considerably in importance. In this context, Interferometric Synthetic Aperture Radar (InSAR) systems complement existing data sources by their capability to acquire 3D information at high spatial resolution over large areas independent of weather conditions and illumination. However, penetration of the SAR signals into the snow and ice surface leads to a bias in measured height, which has to be corrected to obtain accurate elevation data. Therefore, this study purposes an easy transferable pixel-based approach for X-band penetration-related elevation bias estimation based on single-pass interferometric coherence and backscatter intensity which was performed at two test sites on the Northern Greenland ice sheet. In particular, the penetration bias was estimated using a multiple linear regression model based on TanDEM-X InSAR data and IceBridge laser-altimeter measurements to correct TanDEM-X Digital Elevation Model (DEM) scenes. Validation efforts yielded good agreement between observations and estimations with a coefficient of determination of R\(^2\) = 68% and an RMSE of 0.68 m. Furthermore, the study demonstrates the benefits of X-band penetration bias estimation within the application context of ice sheet elevation change detection.
Background and Objective: Staphylococcus aureus is one of the major pathogens of nosocomial infections as wells as community-acquired (CA) infections worldwide. So far, large-scale comprehensive molecular and epidemiological characterisation of S. aureus from very diverse settings has not been carried out in India. The objective of this study is to evaluate the molecular, epidemiological and virulence characteristics of S. aureus in both community and hospital settings in Chennai, southern India. Methods: S. aureus isolates were obtained from four different groups (a) healthy individuals from closed community settings, (b) inpatients from hospitals, (c) outpatients from hospitals, representing isolates of hospital-community interface and (d) HIV-infected patients to define isolates associated with the immunocompromised. Antibiotic susceptibility testing, multiplex polymerase chain reactions for detection of virulence and resistance determinants, molecular typing including Staphylococcal cassette chromosome mec (SCCmec) and agr typing, were carried out. Sequencing-based typing was done using spa and multilocus sequence typing (MLST) methods. Clonal complexes (CC) of hospital and CA methicillin-resistant S. aureus (MRSA) were identified and compared for virulence and resistance.
Results and Conclusion: A total of 769 isolates of S. aureus isolates were studied. The prevalence of MRSA was found to be 7.17%, 81.67%, 58.33% and 22.85% for groups a, b, c and d, respectively. Of the four SCCmec types (I, III, IV and V) detected, SCCmec V was found to be predominant. Panton-Valentine leucocidin toxin genes were detected among MRSA isolates harbouring SCCmec IV and V. A total of 78 spa types were detected, t657 being the most prevalent. 13 MLST types belonging to 9 CC were detected. CC1 (ST-772, ST-1) and CC8 (ST238, ST368 and ST1208) were found to be predominant among MRSA. CA-MRSA isolates with SCCmec IV and V were isolated from all study groups including hospitalised patients and were found to be similar by molecular tools. This shows that CA MRSA has probably infiltrated into the hospital settings.
Disruptions in brain serotonin (5-hydroxytryptamine, 5-HT) signaling pathways have been associated with etiology and pathogenesis of various neuropsychiatric disorders, but specific neural mechanisms of 5-HT function are yet to be fully elucidated. Tryptophan hydroxylase 2 (TPH2) is the rate-limiting enzyme for brain 5-HT synthesis. Therefore, in this study a tamoxifen (Tam)-inducible cre-mediated conditional gene (Tph2) knockout in adult mouse brain (Tph2icKO) has been established to decipher the specific role of brain 5-HT in the regulation of behavior in adulthood.
Immunohistochemistry and high-performance liquid chromatography (HPLC) were used first to test the efficacy of Tam-inducible inactivation of Tph2 and consequential reduction of 5-HT in adult mouse brain. Tam treatment resulted in ≥90% reduction in the number of 5-HT immuno-reactive cells in the anterior raphe nuclei. HPLC revealed a significant reduction in concentration of 5-HT and its metabolite 5-hydroxyindole acetic acid (5-HIAA) in selected brain regions of Tph2icKO, indicating the effectiveness of the protocol used.
Second, standard behavioral tests were used to assess whether reduced brain 5-HT concentrations could alter anxiety-, fear- and depressive-like behavior in mice. No altered anxiety- and depressive-like behaviors were observed in Tph2icKO compared to control mice (Tph2CON) in all indices measured, but Tph2icKO mice exhibited intense and sustained freezing during context-dependent fear memory retrieval. Tph2icKO mice also exhibited locomotor hyperactivity in the aversive environments, such as the open field, and consumed more food and fluid than Tph2CON mice.
Lastly, the combined effect of maternal separation (MS) stress and adult brain 5-HT depletion on behavior was assessed in male and female mice. Here, MS stress, 5-HT depletion and their interaction elicited anxiety-like behavior in a sex-dependent manner. MS reduced exploratory behavior in both male and female mice. Reduced 5-HT enhanced anxiety in female, but not in male mice.
Furthermore, expression of genes related to the 5-HT system and emotionality (Tph2, Htr1a, Htr2a, Maoa and Avpr1a) was assessed by performing a quantitative real-time PCR. In Tph2icKO mice there was a reduction in expression of Tph2 in the raphe nuclei of both male and female mice. Interaction between MS stress and 5-HT deficiency was detected showing increased Htr2a and Maoa expression in raphe and hippocampus respectively of female mice. In male mice, MS stress and 5-HT depletion interaction effects reduced Avpr1a expression in raphe, while the expression of Htr1a, Htr2a and Maoa was differentially altered by 5-HT depletion and MS in various brain regions.
In recent years many discoveries have been made that reveal a close relation between quantum information and geometry in the context of the AdS/CFT correspondence. In this duality between a conformal quantum field theory (CFT) and a theory of gravity on Anti-de Sitter spaces (AdS) quantum information quantities in CFT are associated with geometric objects in AdS. Subject of this thesis is the examination of this intriguing property of AdS/CFT. We study two central elements of quantum information: subregion complexity -- which is a measure for the effort required to construct a given reduced state -- and the modular Hamiltonian -- which is given by the logarithm of a considered reduced state.
While a clear definition for subregion complexity in terms of unitary gates exists for discrete systems, a rigorous formulation for quantum field theories is not known.
In AdS/CFT, subregion complexity is proposed to be related to certain codimension one regions on the AdS side.
The main focus of this thesis lies on the examination of such candidates for gravitational duals of subregion complexity.
We introduce the concept of \textit{topological complexity}, which considers subregion complexity to be given by the integral over the Ricci scalar of codimension one regions in AdS. The Gauss-Bonnet theorem provides very general expressions for the topological complexity of CFT\(_2\) states dual to global AdS\(_3\), BTZ black holes and conical defects. In particular, our calculations show that the topology of the considered codimension one bulk region plays an essential role for topological complexity.
Moreover, we study holographic subregion complexity (HSRC), which associates the volume of a particular codimension one bulk region with subregion complexity. We derive an explicit field theory expression for the HSRC of vacuum states. The formulation of HSRC in terms of field theory quantities may allow to investigate whether this bulk object indeed provides a concept of subregion complexity on the CFT side. In particular, if this turns out to be the case, our expression for HSRC may be seen as a field theory definition of subregion complexity. We extend our expression to states dual to BTZ black holes and conical defects.
A further focus of this thesis is the modular Hamiltonian of a family of states \(\rho_\lambda\) depending on a continuous parameter \(\lambda\). Here \(\lambda\) may be associated with the energy density or the temperature, for instance.
The importance of the modular Hamiltonian for quantum information is due to its contribution to relative entropy -- one of the very few objects in quantum information with a rigorous definition for quantum field theories.
The first order contribution in \(\tilde{\lambda}=\lambda-\lambda_0\) of the modular Hamiltonian to the relative entropy between \(\rho_\lambda\) and a reference state \(\rho_{\lambda_0}\) is provided by the first law of entanglement. We study under which circumstances higher order contributions in \(\tilde{\lambda}\) are to be expected.
We show that for states reduced to two entangling regions \(A\), \(B\) the modular Hamiltonian of at least one of these regions is expected to provide higher order contributions in \(\tilde{\lambda}\) to the relative entropy if \(A\) and \(B\) saturate the Araki-Lieb inequality. The statement of the Araki-Lieb inequality is that the difference between the entanglement entropies of \(A\) and \(B\) is always smaller or equal to the entanglement entropy of the union of \(A\) and \(B\).
Regions for which this inequality is saturated are referred to as entanglement plateaux. In AdS/CFT the relation between geometry and quantum information provides many examples for entanglement plateaux. We apply our result to several of them, including large intervals for states dual to BTZ black holes and annuli for states dual to black brane geometries.
We consider the computation of volumes contained in a spatial slice of AdS(3) in terms of observables in a dual CFT. Our main tool is kinematic space, defined either from the bulk perspective as the space of oriented bulk geodesics, or from the CFT perspective as the space of entangling intervals. We give an explicit formula for the volume of a general region in a spatial slice of AdS(3) as an integral over kinematic space. For the region lying below a geodesic, we show how to write this volume purely in terms of entangling entropies in the dual CFT. This expression is perhaps most interesting in light of the complexity = volume proposal, which posits that complexity of holographic quantum states is computed by bulk volumes. An extension of this idea proposes that the holographic subregion complexity of an interval, defined as the volume under its Ryu-Takayanagi surface, is a measure of the complexity of the corresponding reduced density matrix. If this is true, our results give an explicit relationship between entanglement and subregion complexity in CFT, at least in the vacuum. We further extend many of our results to conical defect and BTZ black hole geometries.
In most foreign language learning contexts, there are only rare chance for contact with native speakers of the target language. In such a situation, reading plays an important role in language acquisition as well as in gaining cultural information about the target language and its speakers.
Previous research indicated that reading in foreign language is a complex process, which is influenced by various linguistic, cognitive and affective factors. The aim of the present study was to test two structural models of the relationship between reading comprehension in native language (L1), English language (L2) reading motivation, metacognitive awareness of L2 reading strategies, and reading comprehension of English as a foreign language among the two samples. Furthermore, the current study aimed to examine the differences between Egyptian and German students in their perceived usage of reading strategies during reading English texts, as well as to explore the pattern of their motivation toward reading English texts. For this purpose, 401 students were recruited from Germany (n=200) and Egypt (n=201) to participate in the current study. In order to have information about metacognitive awareness of reading strategies, a self-report questionnaire (SORS) developed by Moktari and Sheory (2002) was used. While the L2 reading motivation variable, was measured by a reading motivation survey (L2RMQ) which was based on reviewed reading motivation research. In addition, two reading tests were administrated one to measure reading comprehension for native language (German/Arabic) and the other to measure English reading comprehension.
To analyze the collected data, descriptive statistics and independent t-tests were performed. In addition, further analysis using structural equation modeling was applied to test the strength of relationships between the variables under study.
The results from the current research revealed that L1 reading comprehension, whether in a German or Arabic language, had the strongest relationship with L2 reading comprehension. However, the relationship between L2 intrinsic reading motivation was not proven to be significant in either the German or Egyptian models. On the other hand, the relationship between L2 extrinsic reading motivation, metacognitive awareness of reading strategies, and L2 reading comprehension was only proven significant in the German sample. The discussion of these results along with their pedagogical implications for education and practice will be illustrated in the following study.
G protein-coupled receptor research looks out for new technologies to elucidate the complex
processes of receptor activation, function and downstream signaling with spatiotemporal
resolution, preferably in living cells and organisms. A thriving approach consists in making use
of the unsurpassed properties of light, including its high precision in space and time, noninvasiveness
and high degree of orthogonality regarding biological processes. This is realized
by the incorporation of molecular photoswitches, which are able to effectively respond to light,
such as azobenzene, into the structure of a ligand of a given receptor. The muscarinic
acetylcholine receptors belong to class A GPCRs and have received special attention in this
regard due to their role as a prototypic pharmacological system and their therapeutic potential.
They mediate the excitatory and inhibitory effects of the neurotransmitter acetylcholine and
thus regulate diverse important biological processes, especially many neurological functions in
our brain.
In this work, the application of photopharmacological tool compounds to muscarinic receptors
is presented, consisting of pharmacophores extended with azobenzene as light-responsive
motif. Making use of the dualsteric concept, such photochromic ligands can be designed to bind
concomitantly to the orthosteric and allosteric binding site of the receptor, which is
demonstrated for BQCAAI (M1) and PAI (M2) and may lead to subtype- and functionalselective
photoswitchable ligands, suitable for further ex vivo and in vivo studies.
Moreover, photoswitchable ligands based on the synthetic agonist iperoxo were investigated
extensively with regard to their photochemical behavior and pharmacological profile, outlining
the advantages and challenges of using red-shifted molecular photoswitches, such as tetraortho-
fluoro azobenzene. For the first time on a GPCR it was examined, which impact the
different substitution pattern has on both the binding and the activity on the M1 receptor. Results
show that substituted azobenzenes in photopharmacological compounds (F4-photoiperoxo and
F4-iper-azo-iper) not just represent analogs with other photophysical properties but can exhibit
a considerably different biological profile that has to be investigated carefully.
The achievements gained in this study can give important new insights into the binding mode
and time course of activation processes, enabling precise spatial and temporal resolution of the
complex signaling pathway of muscarinic receptors. Due to their role as exemplary model
system, these findings may be useful for the investigation into other therapeutically relevant
GPCRs.
Research on the deployment and use of technology to assist learning has seen a significant
rise over the last decades (Aparicio et al., 2017). The focus on course quality, technology,
learning outcome and learner satisfaction in e-learning has led to insufficient attention by
researchers to individual characteristics of learners (Cidral et al., 2017 ; Hsu et al., 2013). The current work aims to bridge this gap by investigating characteristics identified by previous works and backed by theory as influential individual differences in e-learning. These learner characteristics have been suggested as motivational factors (Edmunds et al., 2012) in decisions by learners to interact and exchange information (Luo et al., 2017).
In this work e-learning is defined as interaction dependent information seeking and sharing enabled by technology. This is primarily approached from a media psychology perspective. The role of learner characteristics namely, beliefs about the source of knowledge (Schommer, 1990), learning styles (Felder & Silverman, 1988), need for affect (Maio & Esses, 2001), need for cognition (Cacioppo & Petty, 1982) and power distance (Hofstede, 1980) on interactions to seek and share information in e-learning are investigated. These investigations were shaped by theory and empirical lessons as briefly mentioned in the next paragraphs. Theoretical support for investigations is derived from the technology acceptance model(TAM) by psychologist Davis (1989) and the hyper-personal model by communication scientist Walther (1996). The TAM was used to describe the influence of learner characteristics on decisions to use e-learning systems (Stantchev et al., 2014). The hyper-personal model described why computer-mediated communication thrives in e-learning (Kaye et al., 2016) and how learners interpret messages exchanged online (Hansen et al., 2015). This theoretical framework was followed by empirical reviews which justified the use of interaction and information seeking-sharing as key components of e-learning as well as the selection of learner characteristics. The reviews provided suggestions for the measurement of variables (Kühl et al., 2014) and the investigation design (Dascalau et al., 2015). Investigations were designed and implemented through surveys and quasi experiments which were used for three preliminary studies and two main studies. Samples were selected from Germany and Ghana with same variables tested in both countries. Hypotheses were tested with interaction and information seeking-sharing as dependent variables while beliefs about the source of knowledge, learning styles, need for affect, need for cognition and power distance were independent variables. Firstly, using analyses of variance, the influence of beliefs about the source of knowledge on interaction choices of learners was supported. Secondly, the role of need for cognition on interaction choices of learners was supported by results from a logistic regression. Thirdly, results from multiple linear regressions backed the influence of need for cognition and power distance on information seeking-sharing behaviour of learners. Fourthly, the relationship between need for affect and need for cognition
was supported. The findings may have implications for media psychology research, theories used in this work, research on e-learning, measurement of learner characteristics and the design of e-learning platforms. The findings suggest that, the beliefs learners have about the source of knowledge, their need for cognition and their power distance can influence decisions to interact and seek or share information. The outlook from reviews and findings in this work predicts more research on learner characteristics and a corresponding intensity in the use of e-learning by individuals. It is suggested that future studies investigate the relationship between learner autonomy and power distance. Studies on inter-cultural similarities amongst e-learners in different populations are also
suggested.
Protein-protein interaction (PPI) studies are gaining momentum these days due to the plethora of various high-throughput experimental methods available for detecting PPIs. Proteins create complexes and networks by functioning in harmony with other proteins and here in silico network biology hold the promise to reveal new functionality of genes as it is very difficult and laborious to carry out experimental high-throughput genetic screens in living organisms. We demonstrate this approach by computationally screening C. elegans conserved homologs of already reported human tumor suppressor and aging associated genes. We select by this nhr-6, vab-3 and gst-23 as predicted longevity genes for RNAi screen. The RNAi results demonstrated the pro-longevity effect of these genes. Nuclear hormone receptor nhr-6 RNAi inhibition resulted in a C. elegans phenotype of 23.46% lifespan reduction. Moreover, we show that nhr-6 regulates oxidative stress resistance in worms and does not affect the feeding behavior of worms. These findings imply the potential of nhr-6 as a common therapeutic target for aging and cancer ailments, stressing the power of in silico PPI network analysis coupled with RNAi screens to describe gene function.
Studies of the fragmentation of jets into charged particles in heavy-ion collisions can help in understanding the mechanism of jet quenching by the hot and dense QCD matter created in such collisions, the quark-gluon plasma. These proceedings present a measurement of the angular distribution of charged particles around the jet axis in root s(NN) = 5.02 TeV Pb+Pb and pp collisions, done using the ATLAS detector at the LHC. The measurement is performed inside jets reconstructed with the anti-k(t) algorithm with radius parameter R = 0.4, and is extended to regions outside the jet cone. Results are presented as a function of Pb+Pb collision centrality, and both jet and charged-particle transverse momenta.
The Best for the Most Important: Maintaining a Pristine Proteome in Stem and Progenitor Cells
(2019)
Pluripotent stem cells give rise to reproductively enabled offsprings by generating progressively lineage-restricted multipotent stem cells that would differentiate into lineage-committed stem and progenitor cells. These lineage-committed stem and progenitor cells give rise to all adult tissues and organs. Adult stem and progenitor cells are generated as part of the developmental program and play critical roles in tissue and organ maintenance and/or regeneration. The ability of pluripotent stem cells to self-renew, maintain pluripotency, and differentiate into a multicellular organism is highly dependent on sensing and integrating extracellular and extraorganismal cues. Proteins perform and integrate almost all cellular functions including signal transduction, regulation of gene expression, metabolism, and cell division and death. Therefore, maintenance of an appropriate mix of correctly folded proteins, a pristine proteome, is essential for proper stem cell function. The stem cells' proteome must be pristine because unfolded, misfolded, or otherwise damaged proteins would interfere with unlimited self-renewal, maintenance of pluripotency, differentiation into downstream lineages, and consequently with the development of properly functioning tissue and organs. Understanding how various stem cells generate and maintain a pristine proteome is therefore essential for exploiting their potential in regenerative medicine and possibly for the discovery of novel approaches for maintaining, propagating, and differentiating pluripotent, multipotent, and adult stem cells as well as induced pluripotent stem cells. In this review, we will summarize cellular networks used by various stem cells for generation and maintenance of a pristine proteome. We will also explore the coordination of these networks with one another and their integration with the gene regulatory and signaling networks.
Cardiovascular diseases are considered the leading cause of death worldwide according to the World Health Organization. Heart failure is the last stage of most of these diseases, where loss of myocardium leads to architectural and functional decline.
The definitive treatment option for patients with CVDs is organ or tissue transplantation, which relies on donor availability. Therefore, generating an autologous bioengineered myocardium or heart could overcome this limitation. In addition, generating cardiac patches will provide ventricular wall support and enable reparative stem cells delivery to damaged areas. Although many hurdles still exist, a good number of researches have attempted to create an engineered cardiac tissue which can induce endogenous cardiac repair by replacing damaged myocardium.
The present study provided cardiac patches in two models, one by a detergent coronary perfusion decellularization protocol that was optimized, and the other that resulted in a 3D cell-free extracellular matrix with intact architecture and preserved s-glycosaminoglycan and vasculature conduits. Perfusion with 1% Sodium dodecyle sulfate (SDS) under constant pressure resulted in cell-free porcine scaffold within two and cell-free rat scaffold in 7 days, whereas scaffold perfused with 4% sodium deoxycholate (SDO) was not able to remove cells completely. Re-reendothelialization of tissue vasculature was obtained by injecting human microvascular endothelial cell and human fibroblast in 2:1 ratio in a dynamic culture. One-week later, CD31 positive cells and endothelium markers were observed, indicating new blood lining. Moreover, functionality test of re-endothelialized tissue revealed improvement in clotting seen in decellularized tissues. When the tissue was ready to be repopulated, porcine induced pluripotent stem cells (PiPSc) were generated by transfected reprogramming of porcine skin fibroblast and then differentiated to cardiac cells following a robust protocol, for an autologous cardiac tissue model. However, due to the limitation in the PiPSc cell number, alternatively, human induced pluripotent stem cells generated cardiac cells were used.
For reseeding a coculture of human iPSc generated cardiac cells, human mesenchymal stem cells and human fibroblast in 2:1:1 ratio respectively were used in a dynamic culture for 6-8 weeks. Contractions at different areas of the tissue were recorded at an average beating rate of 67 beats/min. In addition, positive cardiac markers (Troponin T), Fibroblast (vemintin), and mesenchymal stem cells (CD90) were detected. Not only that, but by week 3, MSC started differentiating to cardiac cells progressively until few CD90 positive cells were very few by week 6 with increasing troponin t positive cells in parallel. Electrophysiological and drug studies were difficult to obtain due to tissue thickness and limited assessment sources. However, the same construct was established using small intestine submucosa (SISer) scaffold, which recorded a spontaneous beating rate between 0.88 and 1.2 Hz, a conduction velocity of 23.9 ± 0.74 cm s−1, and a maximal contraction force of 0.453 ± 0.015 mN. Moreover, electrophysiological studies demonstrated a drug-dependent response on beating rate; a higher adrenalin frequency was revealed in comparison to the untreated tissue and isoproterenol administration, whereas a decrease in beating rate was observed with propranolol and untreated tissue.
The present study demonstrated the establishment of vascularized cardiac tissue, which can be used for human clinical application.
The role of vessel wall-resident stem cells in the generation of microglia and angiogenisis in the adult CNS
Das Zentralnervensystem (ZNS) wird kontinuierlich durch ein eigenes Immunsystem überwacht. Die Mikroglia sind ein wichtiger Vertreter dieses Immunsystems und ein besonderes Charakteristikum des ZNS. Für die Aufrechterhaltung der Hämostase im ZNS spielen die Mikroglia eine zentrale Rolle. Die Herkunft der Mikroglia war für lange Zeit Gegenstand der kontroversen wissenschaftlichen Diskussion. Zusammengefasst wurde deren Ursprung als hämatopoetisch, mesodermal und neuroektodermal beschrieben. Allerdings überwiegt derzeit die Meinung, dass die Mikroglia von Vorläuferzellen geliefert wird, die während der Embryonalentwicklung aus der Dottersackwand ins Gehirn migrieren, dort bis zum Erwachsenenalter persistieren und immer wieder zur Erneuerung der Mikroglia herangezogen werden. Wo genau im Hirngewebe derartige oder andere potenzielle Mikrogliavorläuferzellen im ZNS residieren, ist bis heute nicht abschließend geklärt.
In der vorliegenden Arbeit konnte gezeigt werden, dass bereits die frisch präparierten Hirngefäße sowohl CD44+ als auch CD45+ Zellen in ihren Wänden aufweisen. Außerdem ließ sich beobachten, dass die CD44+ Zellen im BRA nach außen wanderten und sich zu Perizyten-ähnlichen und glatten Muskelzellen differenzierten. Diese Befunde ließen darauf schließen, dass die CD44+ Zellen mit diesen Eigenschaften das Potenzial haben, zur Gefäßneubildung beizutragen. Darüber hinaus konnten CD45+ Zellen in der Adventitia frisch isolierter Hirngefäße nachgewiesen werden, die im BRA teilweise für F4/80 und/oder Iba-1 positiv wurden. Dies wiederum lässt vermuten, dass aus der Wand der Hirngefäße Mikroglia- und Makrophagen-ähnliche Zellen generiert werden können. Es blieb jedoch offen, ob diese CD45+ Vorläuferzellen dauerhaft in der Adventitia der Hirngefäße residieren oder aber immer wieder durch im Blut zirkulierende Monozyten erneuert werden. Diese Frage zu klären, ist von klinischer Relevanz, bleibt jedoch zukünftigen Arbeiten überlassen. Das hier etablierte BRA könnte auch bei solchen Analysen hilfreich sein.
We consider the process of muon-electron elastic scattering, which has been proposed as an ideal framework to measure the running of the electromagnetic coupling constant at space-like momenta and determine the leading-order hadronic contribution to the muon g-2 (MUonE experiment). We compute the next-to-leading (NLO) contributions due to QED and purely weak corrections and implement them into a fully differential Monte Carlo event generator, which is available for first experimental studies. We show representative phenomenological results of interest for the MUonE experiment and examine in detail the impact of the various sources of radiative corrections under different selection criteria, in order to study the dependence of the NLO contributions on the applied cuts. The study represents the first step towards the realisation of a high-precision Monte Carlo code necessary for data analysis.
Telemedicine uses telecommunication and information technology to provide health care services over spatial distances. In the upcoming demographic changes towards an older average population age, especially rural areas suffer from a decreasing doctor to patient ratio as well as a limited amount of available medical specialists in acceptable distance. These areas could benefit the most from telemedicine applications as they are known to improve access to medical services, medical expertise and can also help to mitigate critical or emergency situations. Although the possibilities of telemedicine applications exist in the entire range of healthcare, current systems focus on one specific disease while using dedicated hardware to connect the patient with the supervising telemedicine center.
This thesis describes the development of a telemedical system which follows a new generic design approach. This bridges the gap of existing approaches that only tackle one specific application. The proposed system on the contrary aims at supporting as many diseases and use cases as possible by taking all the stakeholders into account at the same time. To address the usability and acceptance of the system it is designed to use standardized hardware like commercial medical sensors and smartphones for collecting medical data of the patients and transmitting them to the telemedical center. The smartphone can also act as interface to the patient for health questionnaires or feedback.
The system can handle the collection and transport of medical data, analysis and visualization of the data as well as providing a real time communication with video and audio between the users.
On top of the generic telemedical framework the issue of scalability is addressed by integrating a rule-based analysis tool for the medical data. Rules can be easily created by medical personnel via a visual editor and can be personalized for each patient. The rule-based analysis tool is extended by multiple options for visualization of the data, mechanisms to handle complex rules and options for performing actions like raising alarms or sending automated messages.
It is sometimes hard for the medical experts to formulate their knowledge into rules and there may be information in the medical data that is not yet known. This is why a machine learning module was integrated into the system. It uses the incoming medical data of the patients to learn new rules that are then presented to the medical personnel for inspection. This is in line with European legislation where the human still needs to be in charge of such decisions.
Overall, we were able to show the benefit of the generic approach by evaluating it in three completely different medical use cases derived from specific application needs: monitoring of COPD (chronic obstructive pulmonary disease) patients, support of patients performing dialysis at home and councils of intensive-care experts. In addition the system was used for a non-medical use case: monitoring and optimization of industrial machines and robots. In all of the mentioned cases, we were able to prove the robustness of the generic approach with real users of the corresponding domain. This is why we can propose this approach for future development of telemedical systems.
Damit die Knochenregeneration lege artis abläuft ist ein sensibles und komplexes Zusammenspiel einer Reihe von Faktoren notwendig. Neben bestimmten Zelltypen, die für die Knochenregeneration essentiell sind, sind auch eine Reihe von Wachstumsfaktoren notwendig um die Kommunikation zwischen den Zellverbänden zu gewährleisten und die einzelnen Entwicklungsstadien zu steuern und zu regulieren.
Zur Untersuchung der Möglichkeit, sowohl die Osteokonduktion als auch Vaskularisation eines Scaffolds zu initiieren, wurden in der vorliegenden Arbeit verschiedene Untersuchungsmethoden eingesetzt. Damit wurden adulte humane mesenchymale Stammzellen untersucht, die zur Differenzierung mit den Wachstumsfaktoren bone morphogenetic protein 2 (BMP 2) und/oder vascular endothelial grwoth factor (VEGF) inkubiert und auf Glas- oder Bruschitoberflächen kultiviert wurden. Die Experimente wurden mittels immunologischer Methoden wie Immunfluoreszenz (IF) und Westernblot (WB), sowie über Rasterelektronenmikroskopie (REM) analysiert. Es konnte mit diesen Methoden gezeigt werden, dass die humanen mesenchymalen Stammzellen (hMSC) auf den verschiedenen Substraten adhärierten und proliferierten. Darüber hinaus konnte in der Arbeit nachgewiesen werden, dass unter diesen bestimmten Bedingungen sowohl knöcherne als auch vaskuläre Zellbildung angeregt werden kann. So konnte sowohl auf Glas als auch auf Bruschit mittels IF und REM zum Teil aus hMSC differenzierte Osteoblasten detektiert werden. Diese zeigten die für Osteoblasten typischen Zellfortsätze, mit denen die Osteoblasten mit den Nachbarzellen in Kontakt stehen. Die beginnende Differenzierung zu Osteoblasten bzw. Endothelzellen konnte auch durch Detektion spezfischer Marker, wie z.B. alkalische Phosphatase und PECAM mittels WB gezeigt werden. Jedoch war die in dieser Arbeit zur Untersuchung der ortsgerichteten Differenzierung auf Bruschitsubstrat eingesetzte Methodik nicht geeignet, eindeutige Aussagen zu treffen. Daher müssen zur Untersuchung dieses Vorganges alternative Methoden entwickelt und optimiert werden.
Bei der vorliegenden Arbeit handelt es sich um eine reine in vitro Studie. Dennoch könnten diese Ergebnisse Hinweise auf das Verhalten von hMSC unter Stimulation mit osteogenen und endothelialen Wachstumsfaktoren in vivo im Tierversuch oder im Menschen liefern.
Allerdings wird es bei der Übertragung auf eine kombiniertes in vitro- in vivo Vorgehen hinauslaufen, da das ungerichtete Wachstum von Gewebsformationen eine Hürde für in vivo Studien darstellt.
Pro-migratory signals mediated by the tumor microenvironment contribute to the cancer progression cascade, including invasion, metastasis and resistance to therapy. Derived from in vitro studies, isolated molecular steps of cancer invasion programs have been identified but their integration into the tumor microenvironment and suitability as molecular targets remain elusive. The purpose of the study was to visualize central aspects of tumor progression, including proliferation, survival and invasion by real-time intravital microscopy. The specific aims were to monitor the kinetics, mode, adhesion and chemoattraction mechanisms of tumor cell invasion, the involved guidance structures, and the response of invasion zones to anti-cancer therapy. To reach deeper tumor regions by optical imaging with subcellular resolution, near-infrared and infrared excited multiphoton microscopy was combined with a modified dorsal skinfold chamber model. Implanted HT-1080 fibrosarcoma and B16/F10 and MV3 melanoma tumors developed zones of invasive growth consisting of collective invasion strands that retained cell-cell contacts and high mitotic activity while invading at velocities of up to 200 μm per day. Collective invasion occurred predominantly along preexisting tissue structures, including blood and lymph vessels, collagen fibers and muscle strands of the deep dermis, and was thereby insensitive to RNAi based knockdown and/or antibody-based treatment against β1 and β3 integrins, chemokine (SDF-1/CXCL12) and growth factor (EGF) signaling. Therapeutic hypofractionated irradiation induced partial to complete regression of the tumor main mass, yet failed to eradicate the collective invasion strands, suggesting a microenvironmentally privileged niche. Whereas no radiosensitization was achieved by interference with EGFR or doxorubicin, the simultaneous inhibition of β1 and β3 integrins impaired cell proliferation and survival in spontaneously growing tumors and strongly enhanced the radiation response up to complete eradication of both main tumor and invasion strands. In conclusion, collective invasion in vivo is a robust process which follows preexisting tissue structures and is mainly independent of established adhesion and chemoattractant signaling. Due to its altered biological response to irradiation, collective invasion strands represent a microenvironmentally controlled and clinically relevant resistance niche to therapy. Therefore supportive regimens, such as anoikisinduction by anti-integrin therapy, may serve to enhance radio- and chemoefficacy and complement classical treatment regimens.
Tumor necrosis factor (TNF)-like weak inducer of apoptosis (TWEAK) is a member of the TNF superfamily (TNFSF) and is as such initially expressed as type II class transmembrane glycoprotein from which a soluble ligand form can be released by proteolytic processing. While the expression of TWEAK has been detected at the mRNA level in various cell lines and cell types, its cell surface expression has so far only been documented for dendritic cells, monocytes and interferon-γ stimulated NK cells. The fibroblast growth factor-inducible-14 (Fn14) is a TRAF2-interacting receptor of the TNF receptor superfamily (TNFRSF) and is the only receptor for TWEAK. The expression of Fn14 is strongly induced in a variety of non-hematopoietic cell types after tissue injury. The TWEAK/Fn14 system induces pleiotropic cellular activities such as induction of proinflammatory genes, stimulation of cellular angiogenesis, proliferation, differentiation, migration and in rare cases induction of apoptosis. On the other side, Toll-like receptor3 (TLR3) is one of DNA- and RNA-sensing pattern recognition receptors (PRRs), plays a crucial role in the first line of defense against virus and invading foreign pathogens and cancer cells. Polyinosinic-polycytidylic acid poly(I:C) is a synthetic analog of dsRNA, binds to TLR3 which acts through the adapter TRIF/TICAM1, leading to cytokine secretion, NF-B activation, IRF3 nuclear translocation, inflammatory response and may also elicit the cell death. TWEAK sensitizes cells for TNFR1-induced apoptosis and necroptosis by limiting the availability of protective TRAF2-cIAP1 and TRAF2-cIAP2 complexes, which interact with the TNFR1-binding proteins TRADD and RIPK1. In accordance with the fact that poly(I:C)-induced signaling also involves these proteins, we found enhanced necroptosis-induction in HaCaT and HeLa-RIPK3 by poly(I:C) in the presence of TWEAK (Figure 24). Analysis of a panel of TRADD, FADD, RIPK1 and caspase-8 knockout cells revealed furthermore similarities and differences in the way how these molecules act in cell death signaling by poly(I:C)/TWEAK and TNF and TRAIL. RIPK1 turned out to be essential for poly(I:C)/TWEAK-induced caspase-8-mediated apoptosis but was dispensable for these responses in TNF and TRAIL signaling. Lack of FADD protein abrogated TRAIL- but not TNF- and poly(I:C)-induced necroptosis. Moreover, we observed that both long and short FLIP rescued HaCaT and HeLa-RIPK3 cells from poly(I:C)-induced apoptosis or necroptosis.
To sum up, our results demonstrate that TWEAK, which is produced by interferon stimulated myeloid cells, controls the induction of apoptosis and necroptosis by the TLR3 ligand poly(I:C) and may thus contribute to cancer or anti-viral immunity treatment.
Social robots are becoming increasingly prevalent in everyday life and sex robots are a sub-category of especially high public interest and controversy. Starting from the concept of the otaku, a term from Japanese youth culture that describes secluded persons with a high affinity for fictional manga characters, we examine individual differences behind sex robot appeal (anime and manga fandom, interest in Japanese culture, preference for indoor activities, shyness). In an online-experiment, 261 participants read one out of three randomly assigned descriptions of future technologies (sex robot, nursing robot, genetically modified organism) and reported on their overall evaluation, eeriness, and contact/purchase intentions. Higher anime and manga fandom was associated with higher appeal for all three future technologies. For our male subsample, sex robots and GMOs stood out as shyness yielded a particularly strong relationship to contact/purchase intentions for these new technologies.
In der vorliegenden Arbeit wurden mehrere konventionelle und 3D-konformale Radiotherapie ("3D-CRT")-Techniken in der Bestrahlung von Wirbelsäulenmetastasen miteinander verglichen. Dafür wurde, basierend auf reellen Planungs-CT-Datensätzen, die Bestrahlung von 41 Wirbelsäulen-Zielvolumina mit verschiedenen Techniken simuliert.
Es konnte gezeigt werden, dass im Vergleich zu konventionellen Techniken bereits sehr einfache 3D-CRT-Techniken eine homogenere Abdeckung von Wirbelsäulen-Zielvolumina bei gleichzeitig zuverlässiger Limitierung der Rückenmarksdosis ermöglichen. Angesichts steigender Lebenserwartungen und dem zunehmenden Bedarf an Re-Bestrahlungen kann dies einen entscheidenden Vorteil darstellen.
The transfer hydrogenation of NHC-supported diborenes with dimethylamine borane proceeds with high selectivity for the trans-1,2-dihydrodiboranes(6). DFT calculations suggest a stepwise proton-first-hydride-second reaction mechanism via an intermediate μ-hydrodiboronium dimethylaminoborate ion pair.
Via providing various ecosystem services, the old-growth Hyrcanian forests play a crucial role in the environment and anthropogenic aspects of Iran and beyond. The amount of growing stock volume (GSV) is a forest biophysical parameter with great importance in issues like economy, environmental protection, and adaptation to climate change. Thus, accurate and unbiased estimation of GSV is also crucial to be pursued across the Hyrcanian. Our goal was to investigate the potential of ALOS-2 and Sentinel-1's polarimetric features in combination with Sentinel-2 multi-spectral features for the GSV estimation in a portion of heterogeneously-structured and mountainous Hyrcanian forests. We used five different kernels by the support vector regression (nu-SVR) for the GSV estimation. Because each kernel differently models the parameters, we separately selected features for each kernel by a binary genetic algorithm (GA). We simultaneously optimized R\(^2\) and RMSE in a suggested GA fitness function. We calculated R\(^2\), RMSE to evaluate the models. We additionally calculated the standard deviation of validation metrics to estimate the model's stability. Also for models over-fitting or under-fitting analysis, we used mean difference (MD) index. The results suggested the use of polynomial kernel as the final model. Despite multiple methodical challenges raised from the composition and structure of the study site, we conclude that the combined use of polarimetric features (both dual and full) with spectral bands and indices can improve the GSV estimation over mixed broadleaf forests. This was partially supported by the use of proposed evaluation criterion within the GA, which helped to avoid the curse of dimensionality for the applied SVR and lowest over estimation or under estimation.
Lokalisation und Bedeutung der NO-sensitiven Guanylyl-Cyclase bei der Lungenfibrose in der Maus
(2019)
Die im Rahmen dieser Arbeit behandelten Fragestellungen vermitteln neue Kenntnisse über die Pathogenese der Lungenfibrose auf zellulärer Ebene. Bei der Lungenfibrose handelt es sich um eine chronische Erkrankung, die durch eine initiale Inflammation und das Auftreten von Myofibroblasten gekennzeichnet ist. Die Myofibroblasten führen zu einer vermehrten Produktion von EZM, was in einer Zerstörung der Lungenarchitektur, Narbenbildung und folglich einem verminderten Gasaustausch resultiert. Eine modulatorische Rolle von Stickstoffmonoxid (NO) bei der Entwicklung der Lungenfibrose wird vermutet, dennoch sind die Effektorzellen in der Lunge noch nicht bekannt.
Daher wurde im ersten Teil dieser Arbeit die Lokalisation des NO-Rezeptors, der NO-sensitiven Guanylyl-Cyclase (NO-GC), in der Lunge untersucht. Dazu wurden Knockout-Mäuse generiert, bei denen die NO-GC global (GCKO) oder Perizyten-spezifisch (PDGFRβ-GCKO, SMMHC-GCKO, NG2-GCKO und SMMHC/NG2-GCKO) deletiert ist. Zudem wurden tdTomato-Reportermäuse verwendet, die das Fluoreszenzprotein unter Kontrolle eines spezifischen Reporters exprimieren (PDGFRβ/tomato, SMMHC/tomato, NG2/tomato, FoxD1/tomato und Tie2/tomato). In der Lunge sind Perizyten der NO-GC-exprimierende Zelltyp. Durch Immunhistochemie konnten zudem zwei verschiedene Subpopulationen von NO-GC-exprimierenden Perizyten identifiziert werden: Eine große Population an SMMHC/PDGFRβ-positiven Perizyten und eine kleine Population an NG2/PDGFRβ-positiven Perizyten.
Im zweiten Teil dieser Arbeit wurde die Funktion der NO-GC während der Bleomycin-induzierten Lungenfibrose untersucht. Bleomycin führt zu einer fibrotischen Antwort in allen Genotypen, was durch ein erhöhtes Lungengewicht und einen erhöhten Kollagengehalt deutlich wird. Der Schweregrad der Lungenverletzung ist in NO-GC-defizienten Mäusen größer als in Anwesenheit der NO-GC. Dies deutet auf eine Rolle der NO-GC bei der Bleomycin-induzierten Lungenfibrose hin.
Während der Entstehung der Lungenfibrose kommt es zur Bildung von Myofibroblasten, die als die Schlüsselzellen der Wundheilung und fibrotischer Prozesse bezeichnet werden. Diese Zellen kommen unter physiologischen Bedingungen kaum vor und ihre Herkunft ist nach wie vor nicht eindeutig geklärt. Da Perizyten als mögliche Vorläuferzellen betrachtet werden, wurde Lineage Tracing von Perizyten durchgeführt. Erstmals wurden zwei verschiedene Myofibroblasten-Subtypen durch die Expression von NO-GC unterschieden: (1) NO-GC-positive Myofibroblasten, die in der Alveolarwand lokalisiert sind und von Perizyten abstammen und (2) NO-GC-negative Myofibroblasten, die sich innerhalb der Alveolen befinden, deren Ursprung jedoch nicht Perizyten sind. Diese Myofibroblasten zeigen jedoch eine de novo-Synthese von PDGFRβ. Durch Lineage Tracing-Versuche sowie immunhistochemische Analysen können Perizyten, Endothelzellen und Fibrozyten als Vorläuferzellen ausgeschlossen werden. Die Ursprungszelle der intra-alveolären Myofibroblasten ist somit bislang nicht identifiziert.
Im letzten Teil der Arbeit wurde die Rolle der an der Lungenfibrose beteiligten Zelltypen näher untersucht. Dazu wurde die Auflösung der reversiblen Bleomycin-induzierten Lungenschäden betrachtet. Der Verlust der beiden Myofibroblasten-Subtypen weist darauf hin, dass sie zwar die Effektorzellen der Wundheilungsreaktion, jedoch nicht an der Entstehung der chronisch manifesten Fibrose beteiligt sind. Perizyten proliferieren in Folge der Gabe von Bleomycin und sind vermehrt im Lungenparenchym auch nach Auflösung der Bleomycin-induzierten Lungenverletzung vorzufinden. Diese Ergebnisse führen zu der Annahme, dass es sich hierbei um die Effektorzellen der chronisch manifesten Lungenfibrose handelt, die durch eine Verdickung der Alveolarwand gekennzeichnet ist. Um die zellulären Mechanismen der Lungenfibrose umfassend aufzuklären, müssen weitere Untersuchungen an irreversiblen Fibrosemodellen folgen, die auch die chronischen Charakteristiken der Erkrankung berücksichtigen.
The photophysics of a molecular triad consisting of a BODIPY dye and two pyrene chromophores attached in 2-position are investigated by steady state and fs-time resolved transient absorption spectroscopy as well as by field induced surface hopping (FISH) simulations. While the steady state measurements indicate moderate chromophore interactions within the triad, the time resolved measurements show upon pyrene excitation a delocalised excited state which localises onto the BODIPY chromophore with a time constant of 0.12 ps. This could either be interpreted as an internal conversion process within the excitonically coupled chromophores or as an energy transfer from the pyrenes to the BODIPY dye. The analysis of FISH-trajectories reveals an oscillatory behaviour where the excitation hops between the pyrene units and the BODIPY dye several times until finally they become localised on the BODIPY chromophore within 100 fs. This is accompanied by an ultrafast nonradiative relaxation within the excitonic manifold mediated by the nonadiabatic coupling. Averaging over an ensemble of trajectories allowed us to simulate the electronic state population dynamics and determine the time constants for the nonradiative transitions that mediate the ultrafast energy transfer and exciton localisation on BODIPY.
Sphingolipids are major components of cellular membranes, and at steady-state level, their metabolic fluxes are tightly controlled. On challenge by external signals, they undergo rapid turnover, which substantially affects the biophysical properties of membrane lipid and protein compartments and, consequently, signaling and morphodynamics. In T cells, external cues translate into formation of membrane microdomains where proximal signaling platforms essential for metabolic reprograming and cytoskeletal reorganization are organized. This review will focus on sphingomyelinases, which mediate sphingomyelin breakdown and ensuing ceramide release that have been implicated in T-cell viability and function. Acting at the sphingomyelin pool at the extrafacial or cytosolic leaflet of cellular membranes, acid and neutral sphingomyelinases organize ceramide-enriched membrane microdomains that regulate T-cell homeostatic activity and, upon stimulation, compartmentalize receptors, membrane proximal signaling complexes, and cytoskeletal dynamics as essential for initiating T-cell motility and interaction with endothelia and antigen-presenting cells. Prominent examples to be discussed in this review include death receptor family members, integrins, CD3, and CD28 and their associated signalosomes. Progress made with regard to experimental tools has greatly aided our understanding of the role of bioactive sphingolipids in T-cell biology at a molecular level and of targets explored by a model pathogen (measles virus) to specifically interfere with their physiological activity.
Modulation of insulin-induced genotoxicity in vitro and genomic damage in gestational diabetes
(2019)
Diabetes mellitus is a global health problem, where the risk of diabetes increases rapidly
due to the lifestyle changes. Patients with type II diabetes have many complications
with increased risk of morbidity and mortality. High levels of insulin may lead to DNA
oxidation and damage. Several studies proposed that hyperinsulinemia may be an
important risk factor for various types of cancer. To investigate insulin signaling
pathway inducing oxidative stress and genomic damage, pharmaceutical and natural
compounds which can interfere with the insulin pathway including PI3K inhibitors,
resveratrol, lovastatin, and RAD-001 were selected due to their beneficial effects
against metabolic disorder. Thus, the anti-genotoxic potential of these compounds
regarding insulin-mediated oxidative stress were investigated in normal rat kidney cells
in vitro. Our compounds showed protective effect against genotoxic damage and
significantly decreased reactive oxygen specious after treatment of cells with insulin
with different mechanisms of protection between the compounds. Thus, these
compounds may be attractive candidates for future support of diabetes mellitus therapy.
Next, we explored the link between gestational diabetes mellitus and genomic damage
in cells derived from human blood. Moreover, we investigated the influence of
estradiol, progesterone, adrenaline and triiodothyronine on insulin-induced genomic
damage in vitro. First, we studied the effect of these hormones in human promyelocytic
leukemia cells and next ex vivo with non-stimulated and stimulated peripheral blood
mononuclear cells. In parallel, we also measured the basal genomic damage using three
conditions (whole blood, non-stimulated and stimulated peripheral blood mononuclear
cells) in a small patient study including non-pregnant controls with/without hormonal
contraceptives, with a subgroup of obese women, pregnant women, and gestational
diabetes affected women. A second-time point after delivery was also applied for
analysis of the blood samples. Our results showed that GDM subjects and obese
individuals exhibited higher basal DNA damage compared to lower weight nonpregnant
or healthy pregnant women in stimulated peripheral blood mononuclear cells
in both comet and micronucleus assays. On the other hand, the DNA damage in GDM
women had decreased at two months after birth. Moreover, the applied hormones also
showed an influence in vitro in the enhancement of the genomic damage in cells of the control and pregnant groups but this damage did not exceed the damage which existed
in obese and gestational diabetes mellitus patients with high level of genomic damage.
In conclusion, insulin can induce genomic damage in cultured cells, which can be
modulated by pharmaceutical and naturals substances. This may be for future use in the
protection of diabetic patients, who suffer from hyperinsulinemia during certain disease
stages. A particular form of diabetes, GDM, was shown to lead to elevated DNA
damage in affected women, which is reduced again after delivery. Cells of affected
women do not show an enhanced, but rather a reduced sensitivity for further DNA
damage induction by hormonal treatment in vitro. A potential reason may be an
existence of a maximally inducible damage by hormonal influences.
Proteine können aufgrund ihrer biochemischen Vielfalt eine Vielzahl von Interaktionen
mit anderen Proteinen oder chemischen Verbindungen eingehen. Im ersten Teil dieser
Arbeit wurden Protein-Protein Interaktionen mittels chemischen Quervernetzens
untersucht. Das Ziel war, neue und verbesserte Methoden zu entwickeln, um
Interaktionsnetzwerke zu erstellen. Im zweiten Teil wurden die Interaktionen von
Proteinen mit niedermolekularen Verbindungen untersucht, um Drug Targets zu
identifizieren und zu validieren.
Die Untersuchung von Protein-Protein Interaktionen mittels Massenspektrometrie (MS)
ist eine leistungsfähige Methode, um alle potentiellen Interaktionen eines Proteins nach
einer Anreicherung (Co-IP) aus einem Zelllysat zu detektieren. Durch das zusätzliche
Quervernetzen dieser Proteine und anschließender MS kann ein Interaktionsnetzwerk
erstellt werden, um direkte von indirekten Interaktionen unterscheiden zu können
(Topology Mapping). Zur Methodenetablierung wurden kommerzielle Crosslinker und
rekombinante Proteine von bekannten Interaktionspartnern mit niedriger Komplexität
verwendet. Die beiden Interaktionspartner NPL4 und UFD1 konnten mit dem Crosslinker
BS3 erfolgreich quervernetzt und anhand der vernetzten Peptide identifiziert werden. Im
nächsten Schritt wurde dieser Arbeitsablauf auf eine Co-IP des Mediatorkomplexes aus
Hefe angewendet. Die Probenkomplexität ist hierbei 500 - 1000-fach höher als bei der
Verwendung von rekombinanten Proteinen. Nach der erfolgreichen Quervernetzung
konnte innerhalb des Komplexes ein Interaktionsnetzwerk erstellt werden. Diese Daten
passen zu dem bereits bekannten Modell des Mediatorkomplexes. Interaktionen zu
bekannten Interaktionspartnern, wie der RNA-Pol II, konnten aufgrund deren
substöchiometrischen Anreicherung nicht identifiziert werden.
Aufgrund der genannten Limitationen beim Quervernetzen von Proteinen wurden
folgende neue und verbesserte Methoden entwickelt:
1. Verwendung des spaltbaren Crosslinkers (DSSO), der während der Messung selektiv
durch niedrige Kollisionsenergie gespalten werden kann, um die Datenbanksuche zu
vereinfachen. Die Funktionalität der DSSO-Strategie konnte erfolgreich am Protein
Cytochrom C getestet werden. Bei der ersten Fragmentierung wird der Linker gespalten, anschließend können die getrennten Peptide separat fragmentiert werden. Die erzeugten
Daten sind mit einer Standarddatenbanksuche kompatibel, was bei gemischten Spektren
von zwei Peptiden nicht der Fall wäre. Beim Quervernetzen der rekombinanten
Interaktionspartner UBX und p97N mit DSSO konnte der zu bestätigende Crosslink
zwischen zwei Lysinen nicht identifziert werden. Grund hierfür könnte eine zu kurze
Linkerlänge von DSSO sein. Diese Versuche brachten jedoch einige Limitationen des
Ansatzes zum Vorschein, wie die Beschränkung auf die Protease Trypsin, aufgrund der
positiven Ladung am C-Terminus und die Notwendigkeit von großen Proteinmengen, da
das Spalten des Linkers einen zusätzlichen Intensitätsverlust für die folgende
Identifizierung der Peptide mit sich bringt.
2. Da die niedrige Abundanz von quervernetzten Peptiden das Hauptproblem bei deren
Identifizierung ist, wurde eine Methode entwickelt, um während der Messung direkt nach
diesen niedrig abundanten Spezies zu suchen. Entscheidendes Kriterium hierfür war, dass
quervernetzte Peptide zwei C-Termini haben. Diese wurden zur Hälfte enzymatisch mit
18O bzw. 16O markiert und wieder vereinigt. Der resultierende Massenunterschied von 8
Da (4 x 18O) kommt ausschließlich bei zwei quervernetzten Peptiden vor und kann
während der Messung direkt gesucht werden. Die vollständige Markierung von Peptiden
mit 18O wurde zunächst am Protein Beta-Galaktosidase getestet. Bereits hier stellte sich
heraus, dass der enzymatische Rücktausch von 18O zu 16O ein Problem darstellt und die
Markierungseffizienz von Aminosäuren beeinflusst wird, die sich C-terminal nach der
Spaltstelle befinden. Mit dieser Strategie ließ sich somit keine vollständige Markierung
für alle Peptide erreichen, was für diese Strategie essentiell gewesen wäre.
3. Um alle Probleme zu umgehen, die bei der Identifizierung von quervernetzten Peptiden
auftreten, wurde eine Methode entwickelt, um quervernetzte Proteine anhand von Profilen
nach einer Auftrennung im Polyacrylamidgel (SDS-PAGE) zu identifizieren. Durch das
Quervernetzen von Proteinen entstehen zusätzliche Proteinbanden nach einer SDSPAGE,
die im Gel nach oben verschoben sind. Alle Proteine in diesen neu erzeugten
Bereichen stellen somit potentielle Interaktionspartner dar. Als Modellsystem wurde der
Mediatorkomplex verwendet. Er wurde aus einem Zelllysat mittels Co-IP angereichert
und anschließend quervernetzt. Aus den mittels LC-MS/MS gemessenen Gelfraktionen wurden Proteinprofile erstellt und miteinander verglichen. Die Intensitätsmaxima der
Proteine des Mediatorkomplexes konnten in bestimmten zusätzlichen Fraktionen
gefunden werden, was den indirekten Nachweis für eine Interaktion darstellt. Die
Funktionalität der Strategie konnte somit bestätigt werden. Ein verbleibender Nachteil ist
jedoch die zu geringe Trennleistung von Polyacrylamidgelen. Befinden sich mehr als 50
Proteine in einer Fraktion, können potentielle Interaktionspartner nicht eindeutig zu einer
Untereinheit eines Komplexes zugeordnet werden.
Im zweiten Teil der Arbeit wurde im Rahmen der Klinischen Forschergruppe 216
(CRU216) Interaktionen von Proteinen mit verschiedenen niedermolekularen
Verbindungen massenspektrometrisch untersucht, um potentielle Drug Targets zu
identifizieren. Diese Versuche sind vergleichbar mit Co-IP Experimenten, da sich der
Arbeitsablauf nur durch die Anreicherung mittels chemischer Verbindung unterscheidet.
Hierzu wurden biotinylierte Verbindungen immobilisiert und potentielle Drug Targets
aus einem komplexen Zelllysat angereichert. Die Identifzierung der echten
Bindungspartner wurde über quantitive Massenspektrometrie erreicht. Dabei wurden die
angereicherten Proteine, die an die niedermolekularen Substanzen binden mit einer
geeigneten Kontrollanreicherung verglichen. Mit den getesteten α-acyl
Aminocarboxamiden konnten verschiedene Proteinkomplexe und interagierende Proteine
spezifisch angereichert werden. Hierbei waren die vier Kinasen DNA-PK, ATM, ATR
und mTOR besonders interessant, da sie mit onkogenem Signalling und
Überlebensmechanismen wie der Hitzeschockantwort in Zellen des Multiplen Myeloms
(MM) in Verbidnung stehen. Die Inhibition der DNA-PK, ATM, ATR und mTOR mit α-
acyl Aminocarboxamiden stellt somit einen möglichen Therapieansatz dar, wenn er
zusammen mit hitzestressauslösenden Inhibitoren verwendet wird. Weiterhin konnte
gezeigt werden, dass die Armadillodomäne innerhalb der potentiellen Drug targets
signifkant angereichert wurde. Sie stellt damit eine potentielle Bindestelle der α-acyl
Aminocarboxamide dar.
Abschließend wurden Proteine mit biotinylierten Naphtylisochinolinen aus einem MMZelllysat
angereichert, deren Vorläufersubstanzen eine Wirkung auf Tumorzellen und den Malariaparasit Plasmodium falciparum gezeigt hatten. Hierbei konnten vor allem RNAbindende-
und mRNA-Splicing Proteine identifiziert werden, die zum Teil essentiell für
das Spleißen in-vivo sind. Hierzu gehören mehrere Untereinheiten der Splicing Factoren
3A und 3B. Die Veränderung der transkriptionellen Regulation und der resultierende
Effekt auf Krebszellen konnte bereits in anderen Studien mit dem Inhibitor Spliceostatin
A gezeigt werden, der das Spleißen beeinflusst.
Das Multiple Myelom stellt in Deutschland die zweithäufigste hämatologische Neoplasie dar. Im Rahmen der Induktionstherapie mit anschließender autologer Stammzelltransplantation werden gehäuft kardiotoxische Substanzen eingesetzt; eine der schwerwiegendsten kardialen Nebenwirkung hierdurch ist die Chemotherapie-induzierte Herzinsuffizienz. In bis zu 10 % der Fälle ist das Multiple Myelom mit einer kardialen Amyloidose (AL-Amyloidose) assoziiert. Deren klinischen Symptomatik kann gehäuft ebenfalls mit Zeichen der Herzinsuffizienz einhergehen. Die Echokardiographie stellt für die Diagnostik der Herzinsuffizienz den Goldstandard dar.
Ziel dieser retrospektiven Kohortenstudie (AmcorRetro-Studie) war es durch den Vergleich der echokardiographischen Parameter vor/nach Induktionstherapie mögliche kardiotoxische Effekte und prognostischer Relevanz während der Therapie zu bestimmen. Des Weiteren erfolgte die Evaluation der Prävalenz der kardialen Amyloidose. In einer weiteren Analyse erfolgte pulmonaler Parameter mittels Lungenfunktionsdiagnostik während des Therapieverlaufes. Initial waren 325 Patienten, die im Rahmen der Therapie des Multiplen Myeloms in den Jahren von 2004 bis 2011 mindestens einmal an der Universitätsklinik Würzburg autolog stammzelltransplantiert wurden, eingeschlossen. In der hier vorliegenden Arbeit mit dem Schwerpunkt der echokardiographischen Endpunkte befinden sich 100 Patienten in der Kohorte, bei denen mindestens zwei serielle Echokardiographien (vor und nach Induktion) vorlagen.
In der Analyse der echokardiographischen Parameter (Follow-up im Median 13 Monaten) konnte eine signifikante Reduktion der linken Vorhofparameter nachgewiesen werden (LADs: -1,5 mm, p = 0,009; Septumdicke: - 1 mm, p = 0,001). Es gab keine signifikanten Einflüsse auf die linksventrikuläre Pumpfunktion (vor/nach der Therapie ≥ 55%, p = 0,24), allerdings entwickelten drei Patienten eine Abnahme der systolischen Funktion < 50 % (p = 0,08). Im Gegensatz dazu zeigte sich eine signifikante Zunahme der diastolischen Dysfunktion um 16,5 % (p = 0,002). In der univariaten Cox-Regressionsanalyse war eine höhere systolische Pumpfunktion mit einem signifikanten Überleben assoziiert (HR= 0,89; p = 0,05).
In unser Kohorte hatten sieben Patienten (N = 7/100) vor Induktion den histologischen Nachweis einer Amyloidose (Prävalenz 7 %), in zwei Fällen mit kardialer Beteiligung (N= 2/100).
Im Vergleich der Lungenfunktionsdiagnostik (vor/nach Induktion) zeigte sich eine signifikante Zunahme des Residualvolumens (p = 0,04). In der univariaten Cox- Regressionsanalyse war eine hohe Vitalkapazität sowie hohe Einsekundenkapazität mit einem signifikanten Überlebensvorteil assoziiert. Dieser Trend zeigte sich ebenfalls auch nach trivariater Adjustierung für Alter und Geschlecht (VC in %: HR= 1,0; p= 0,03 und FEV1 in %: HR= 1,0; p = 0,07).
Die Studie konnte mit der hier nachgewiesenen Prävalenz von 7 % bestätigen, dass die kardiale Amyloidose eine seltene Folgeerkrankung des Multiplen Myeloms ist. Die Stammzell-transplantation hat sowohl positive (Reduktion LADs, Septumdicke) als auch negative Auswirkungen (Anstieg diastolische Dysfunktion, im Trend Zunahme der Patienten mit eingeschränkter systolischer Funktion) auf die kardiale Funktion. Die systolische Funktion war als einziges prognoserelevant. Unter der Chemotherapie konnte eine Zunahme des Residualvolumens und somit eine direkte Lungenschädigung beobachtet werden.
In vorliegender Dissertation wurde zunächst die Häufigkeit einer trampolinassoziierten Verletzung bei Kindern aus einem Patientenkollektiv der Abteilung für Kinderchirurgie der Universität Würzburg ermittelt. Dabei sollten alters- und geschlechtsspezifische Unterschiede, sowie der Unfallhergang Berücksichtigung finden. In einer ausführlichen Darstellung wurden die zugezogenen Verletzungen, sowie deren Therapie veranschaulicht. Zuletzt wurde in einer Gesamtschau ermittelt, ob die Anzahl der trampolinassoziierten Verletzungen in den letzten 7 Jahren in Würzburg zugenommen hat.
Activated platelets and coagulation jointly contribute to physiological hemostasis. However, pathological conditions can also trigger unwanted platelet activation and initiation of coagulation resulting in thrombosis and precipitation of ischemic damage of vital organs such as the heart or brain. The specific contribution of procoagulant platelets, positioned at the interface of the processes of platelet activation and coagulation, in ischemic stroke had remained uninvestigated. The first section of the thesis addresses this aspect through experiments conducted in novel megakaryocyte- and platelet-specific TMEM16F conditional KO mice (cKO). cKO platelets phenocopied defects in platelets from Scott Syndrome patients and had severely impaired procoagulant characteristics. This led to decelerated platelet-driven thrombin generation and delayed fibrin formation. cKO mice displayed prolonged bleeding times and impaired arterial thrombosis. However, infarct volumes in cKO mice were comparable to wildtype (WT) mice in an experimental model of ischemic stroke. Therefore, while TMEM16F-regulated platelet procoagulant activity is critical for hemostasis and thrombosis, it is dispensable for cerebral thrombo-inflammation in mice.
The second section describes the generation and initial characterization of a novel knockin mouse strain that expresses human coagulation factor XII (FXII) instead of endogenous murine FXII. These knockin mice had normal occlusion times in an experimental model of arterial thrombosis demonstrating that human FXII is functional in mice. Therefore, these mice constitute a valuable tool for testing novel pharmacological agents against human FXII – an attractive potential target for antithrombotic therapy.
Glycoprotein (GP)VI and C-type lectin-like receptor 2 (CLEC-2)-mediated (hem)immunoreceptor tyrosine-based activation motif (ITAM) signaling represent a major pathway for platelet activation. The last section of the thesis provides experimental evidence for redundant functions between the two members of the Grb2 family of adapter proteins - Grb2 and Gads that lie downstream of GPVI and CLEC-2 stimulation. In vitro and in vivo studies in mice deficient in both Grb2 and Gads (DKO) revealed that DKO platelets had defects in (hem)ITAM-stimulation-specific activation, aggregation and signal transduction that were more severe than the defects observed in single Grb2 KO or Gads KO mice. Furthermore, the specific role of these adapters downstream of (hem)ITAM signaling was essential for maintenance of hemostasis but dispensable for the known CLEC-2 dependent regulation of blood-lymphatic vessel separation.
Der allgemeinradiologische Ultraschall leistet einen wichtigen Beitrag in der Routinediagnostik der akuten Appendizitis bei Kindern und Erwachsenen. Die Zusammenschau aller verfügbaren diagnostischen Befunde sollte zur Entscheidung für oder gegen eine Operation herangezogen werden. Die sonographische Untersuchung kann dazu beitragen, die Negativ Appendektomierate zu senken.
Autosomal recessive congenital ichthyosis (ARCI) belongs to a heterogeneous group of disorders of keratinization. To date, 10 genes have been identified to be causative for ARCI. NIPAL4 (Nipa‐Like Domain‐Containing 4) is the second most commonly mutated gene in ARCI. In this study, we present a large cohort of 101 families affected with ARCI carrying mutations in NIPAL4. We identified 16 novel mutations and increase the total number of pathogenic mutations in NIPAL4 to 34. Ultrastructural analysis of biopsies from six patients showed morphological abnormalities consistent with an ARCI EM type III. One patient with a homozygous splice site mutation, which leads to a loss of NIPAL4 mRNA, showed additional ultrastructural aberrations together with a more severe clinical phenotype. Our study gives insights into the frequency of mutations, a potential hot spot for mutations, and genotype–phenotype correlations.
ADHS-Patienten im Alter von 8-12 Jahren wurde ein Ruhe-EEG von 10 Minuten jeweils mediziert sowie medikamentennüchtern abgeleitet und mittels des Vigilanzalgorithmus Leipzig von Hegerl und Hensch (2012) ausgewertet und den bei gesunden Kontrollkindern gleichen Alters gemessenen EEG-Frequenzen nach Auswertung durch die gleiche Methode gegenübergestellt.
The attitude and orbit control system of pico- and nano-satellites to date is one of the bottle necks for future scientific and commercial applications. A performance increase while keeping with the satellites’ restrictions will enable new space missions especially for the smallest of the CubeSat classes. This work addresses methods to measure and improve the satellite’s attitude pointing and orbit control performance based on advanced sensor data analysis and optimized on-board software concepts. These methods are applied to spaceborne satellites and future CubeSat missions to demonstrate their validity. An in-orbit calibration procedure for a typical CubeSat attitude sensor suite is developed and applied to the UWE-3 satellite in space. Subsequently, a method to estimate the attitude determination accuracy without the help of an external reference sensor is developed. Using this method, it is shown that the UWE-3 satellite achieves an in-orbit attitude determination accuracy of about 2°.
An advanced data analysis of the attitude motion of a miniature satellite is used in order to estimate the main attitude disturbance torque in orbit. It is shown, that the magnetic disturbance is by far the most significant contribution for miniature satellites and a method to estimate the residual magnetic dipole moment of a satellite is developed. Its application to three CubeSats currently in orbit reveals that magnetic disturbances are a common issue for this class of satellites. The dipole moments measured are between 23.1mAm² and 137.2mAm². In order to autonomously estimate and counteract this disturbance in future missions an on-board magnetic dipole estimation algorithm is developed.
The autonomous neutralization of such disturbance torques together with the simplification of attitude control for the satellite operator is the focus of a novel on-board attitude control software architecture. It incorporates disturbance torques acting on the satellite and automatically optimizes the control output. Its application is demonstrated in space on board of the UWE-3 satellite through various attitude control experiments of which the results are presented here.
The integration of a miniaturized electric propulsion system will enable CubeSats to perform orbit control and, thus, open up new application scenarios. The in-orbit characterization, however, poses the problem of precisely measuring very low thrust levels in the order of µN. A method to measure this thrust based on the attitude dynamics of the satellite is developed and evaluated in simulation. It is shown, that the demonstrator mission UWE-4 will be able to measure these thrust levels with a high accuracy of 1% for thrust levels higher than 1µN.
The orbit control capabilities of UWE-4 using its electric propulsion system are evaluated and a hybrid attitude control system making use of the satellite’s magnetorquers and the electric propulsion system is developed. It is based on the flexible attitude control architecture mentioned before and thrust vector pointing accuracies of better than 2° can be achieved. This results in a thrust delivery of more than 99% of the desired acceleration in the target direction.
CCR6 kontrolliert selektiv die Monozyten-vermittelte Entzündungsreaktion in der Atherosklerose
(2019)
Der Chemokinrezeptor CCR6 wird von einer Vielzahl unterschiedener Zelltypen exprimiert,
wie zum Beispiel Monozyten, Th17-Zellen und regulatorische T-Zellen,
die im Zusammenhang mit der Entstehung von Atherosklerose stehen. Um die
Bedeutung von CCR6 in der Pathogenese der Atherosklerose bestimmen zu können,
wurden CCR6-defiziente (Ccr6-/- ) Mäuse mit low-density lipoprotein receptordefizienten
(Ldlr-/-) Mäusen gekreuzt, um Tiere zu erhalten, die anfällig für Atherosklerose
und zudem CCR6-defizient sind. Nach acht Wochen pro-atherogener, fettreicher
western-type diet war die Ausprägung der atherosklerotischen Läsionen im
Aortensinus und der gesamten Aorta, sowie deren Gehalt an Plaquemakrophagen in
den Ccr6-/-Ldlr-/- Tieren im Vergleich zu den Ldlr-/- Kontrolltieren signifikant vermindert.
Die lokale und die systemische Verteilung von T-Zellen sowie die Häufigkeit
von Th1-, Th17-Zellen und regulatorischen T-Zellen blieb hingegen unverändert. Im
Gegensatz dazu reduzierte sich die Zahl der im Blut zirkulierenden Gr-1high und
Gr-1low Monozyten in den Ccr6-/-Ldlr-/- Tieren deutlich. Weiter konnte gezeigt werden,
dass über CCR6 in vitro die Adhäsion von Monozyten an inflammatorisch
verändertem Endothel und in vivo die Adhäsion von Leukozyten an das Endothel
der Karotiden vermittelt wird. Des Weiteren wurden in einem air pouch-Modell für
akute Entzündungsreaktionen mittels CCR6 spezifisch Monozyten, aber keine TZellen
rekrutiert.
Summa summarum konnte die Bedeutung von CCR6 auf verschiedenen Ebenen
der Pathogenese der Atherosklerose gezeigt werden: Während CCR6 für die Hypercholesterinämie
assoziierte adaptive Immunantwort entbehrlich ist, reguliert es
die Mobilisierung, Adhäsion und Rekrutierung von Monozyten und kontrolliert über
diese Mechanismen die Akkumulation von Makrophagen und Genese atherosklerotischer
Läsionen. CCR6 und sein Ligand CCL20 könnten somit vielversprechende
Ziele neuer pharmakologischer Therapieansätze sein, um auch die Atherogenese im
Menschen zu unterbinden.
Die Ergebnisse der Dissertation wurden im Dezember 2013 im Journal Thrombosis
and Haematostasis unter dem Titel “CCR6 selectively promotes monocyte mediated
inflammation and atherogenesis in mice“ in geteilter Erstautorenschaft von
Helga Manthey, Clément Cochain und Stefanie Barnsteiner veröffentlicht (PMID:
24114205).
Connecting lysosomes and mitochondria – a novel role for lipid metabolism in cancer cell death
(2019)
Background
The understanding of lysosomes has been expanded in recent research way beyond their view as cellular trash can. Lysosomes are pivotal in regulating metabolism, endocytosis and autophagy and are implicated in cancer. Recently it was discovered that the lysosomal V-ATPase, which is known to induce apoptosis, interferes with lipid metabolism in cancer, yet the interplay between these organelles is poorly understood.
Methods
LC-MS/MS analysis was performed to investigate lipid distribution in cells. Cell survival and signaling pathways were analyzed by means of cell biological methods (qPCR, Western Blot, flow cytometry, CellTiter-Blue). Mitochondrial structure was analyzed by confocal imaging and electron microscopy, their function was determined by flow cytometry and seahorse measurements.
Results
Our data reveal that interfering with lysosomal function changes composition and subcellular localization of triacylglycerids accompanied by an upregulation of PGC1α and PPARα expression, master regulators of energy and lipid metabolism. Furthermore, cardiolipin content is reduced driving mitochondria into fission, accompanied by a loss of membrane potential and reduction in oxidative capacity, which leads to a deregulation in cellular ROS and induction of mitochondria-driven apoptosis. Additionally, cells undergo a metabolic shift to glutamine dependency, correlated with the fission phenotype and sensitivity to lysosomal inhibition, most prominent in Ras mutated cells.
Conclusion
This study sheds mechanistic light on a largely uninvestigated triangle between lysosomes, lipid metabolism and mitochondrial function. Insight into this organelle crosstalk increases our understanding of mitochondria-driven cell death. Our findings furthermore provide a first hint on a connection of Ras pathway mutations and sensitivity towards lysosomal inhibitors.
Protein kinase A (PKA) is the main effector of cyclic-adenosine monophosphate (cAMP) and plays an important role in steroidogenesis and proliferation of adrenal cells. In a previous study we found two mutations (L206R, 199_200insW) in the main catalytic subunit of protein kinase A (PKA C) to be responsible for cortisol-producing adrenocortical adenomas (CPAs). These mutations interfere with the formation of a stable holoenzyme, thus causing constitutive PKA activation. More recently, we identified additional mutations affecting PKA C in CPAs associated with overt Cushing syndrome: S213R+insIILR, 200_201insV, W197R, d244 248+E249Q, E32V.
This study reports a functional characterization of those PKA Cmutations linked to CPAs of Cushing’s patients. All analyzed mutations except for E32V showed a reduced interaction with at least one tested regulatory (R) subunit. Interestingly the results of the activity differed among the mutants and between the assays employed. For three mutants (L206R, 199_200insW, S213R+insIILR), the results showed enhanced translocation to the nucleus. This was also observed in CRISPR/Cas9 generated PRKACA L206R mutated HEK293T cells. The enhanced nuclear translocation of this mutants could be due to the lack of R subunit binding, but also other mechanisms could be at play. Additionally, I used an algorithm, which predicted an effect of the mutation on substrate specificity for four mutants (L206R, 199_200insW, 200_201insV, d244 248+E249Q). This was proven using phosphoproteomics for three mutants (L206R, 200_201insV, d244 248+E249Q). In PRKACA L206R mutated CPAs this change in substrate specificity also caused hyperphosphorylation of H1.4 on serine 36, which has been reported to be implicated in mitosis. Due to these observations, I hypothesized, that there are several mechanisms of action of PRKACA mutations leading to increased cortisol secretion and cell proliferation in adrenal cells: interference with the formation of a stable holoenzyme, altered subcellular localization and a change in substrate specificity. My data indicate that some PKA C mutants might act via just one, others by a combination of these mechanisms. Altogether, these findings indicate that several mechanisms contribute to the development of CPAs caused by PRKACA mutations. Moreover, these findings provide a highly illustrative example of how alterations in a protein kinase can cause a human disease.
Vor Einführung der direkt antiviralen Kombinationstherapien war die Kombination aus pegyliertem Interferon plus Ribavirin die Standardbehandlung für Patienten mit chronischer Hepatitis-C-Infektion. Bei 30% der Patienten zeigten sich neurokognitive sowie depressive Nebenwirkungen, die das dauerhafte Therapieansprechen negativ beeinflussen können. Vor diesem Hintergrund untersuchten wir in unserer Arbeit bei 93 Patienten mit chronischer Hepatitis-C-Infektion den Zusammenhang zwischen drei Single Nucleotide Polymorphismen im Bereich des IL28B-Gens und der Verträglichkeit sowie dem Therapieerfolg einer interferonbasierten Behandlung. Der Vergleich zwischen den Ergebnissen im HADS-(Hospital Anxiety and Depression Scale) sowie TAPS- (Testbatterie zur Aufmerksamkeitsprüfung) Testverfahren mit den Genotypen der drei SNPs zeigte im Studienkollektiv keinen signifikanten Zusammenhang. Hinsichtlich des Therapieerfolges konnten wir bei einem der drei SNPs das C-Allel als positiven Prognosefaktor für das dauerhafte Therapieansprechen nachweisen.
Background
Postoperative pulmonary complications (PPCs) increase morbidity and mortality of surgical patients, duration of hospital stay and costs. Postoperative atelectasis of dorsal lung regions as a common PPC has been described before, but its clinical relevance is insufficiently examined. Pulmonary electrical impedance tomography (EIT) enables the bedside visualization of regional ventilation in real-time within a transversal section of the lung. Dorsal atelectasis or effusions might cause a ventral redistribution of ventilation. We hypothesized the existence of ventral redistribution in spontaneously breathing patients during their recovery from abdominal and peripheral surgery and that vital capacity is reduced if regional ventilation shifts to ventral lung regions.
Methods
This prospective observational study included 69 adult patients undergoing elective surgery with an expected intermediate or high risk for PPCs. Patients undergoing abdominal and peripheral surgery were recruited to obtain groups of equal size. Patients received general anesthesia with and without additional regional anesthesia. On the preoperative, the first and the third postoperative day, EIT was performed at rest and during spirometry (forced breathing). The center of ventilation in dorso-ventral direction (COVy) was calculated.
Results
Both groups received intraoperative low tidal volume ventilation. Postoperative ventral redistribution of ventilation (forced breathing COVy; preoperative: 16.5 (16.0–17.3); first day: 17.8 (16.9–18.2), p < 0.004; third day: 17.4 (16.2–18.2), p = 0.020) and decreased forced vital capacity in percentage of predicted values (FVC%predicted) (median: 93, 58, 64%, respectively) persisted after abdominal surgery. In addition, dorsal to ventral shift was associated with a decrease of the FVC%predicted on the third postoperative day (r = − 0.66; p < 0.001). A redistribution of pulmonary ventilation was not observed after peripheral surgery. FVC%predicted was only decreased on the first postoperative day (median FVC%predicted on the preoperative, first and third day: 85, 81 and 88%, respectively). In ten patients occurred pulmonary complications after abdominal surgery also in two patients after peripheral surgery.
Conclusions
After abdominal surgery ventral redistribution of ventilation persisted up to the third postoperative day and was associated with decreased vital capacity. The peripheral surgery group showed only minor changes in vital capacity, suggesting a role of the location of surgery for postoperative redistribution of pulmonary ventilation.
Sea level rise contribution from the Antarctic ice sheet is influenced by changes in glacier and ice shelf front position. Still, little is known about seasonal glacier and ice shelf front fluctuations as the manual delineation of calving fronts from remote sensing imagery is very time-consuming. The major challenge of automatic calving front extraction is the low contrast between floating glacier and ice shelf fronts and the surrounding sea ice. Additionally, in previous decades, remote sensing imagery over the often cloud-covered Antarctic coastline was limited. Nowadays, an abundance of Sentinel-1 imagery over the Antarctic coastline exists and could be used for tracking glacier and ice shelf front movement. To exploit the available Sentinel-1 data, we developed a processing chain allowing automatic extraction of the Antarctic coastline from Seninel-1 imagery and the creation of dense time series to assess calving front change. The core of the proposed workflow is a modified version of the deep learning architecture U-Net. This convolutional neural network (CNN) performs a semantic segmentation on dual-pol Sentinel-1 data and the Antarctic TanDEM-X digital elevation model (DEM). The proposed method is tested for four training and test areas along the Antarctic coastline. The automatically extracted fronts deviate on average 78 m in training and 108 m test areas. Spatial and temporal transferability is demonstrated on an automatically extracted 15-month time series along the Getz Ice Shelf. Between May 2017 and July 2018, the fronts along the Getz Ice Shelf show mostly an advancing tendency with the fastest moving front of DeVicq Glacier with 726 ± 20 m/yr.
Cancer remains after cardiovascular diseases the leading cause of death worldwide and an estimated 8.2 million people died of it in 2012. By 2030, 13 million cancer deaths are expected due to the growth and ageing of the population. Hereof, colorectal cancer (CRC) is the third most common cancer in men and the second in women with a wide geographical variation across the world. Usually, CRC begins as a non-cancerous growth leading to an adenomatous polyp, or adenoma, arising from glandular cells. Since research has brought about better understanding of the mechanisms of cancer development, novel treatments such as targeted therapy have emerged in the past decades. Despite that, up to 95% of anticancer drugs tested in clinical phase I trials do not attain a market authorisation and hence these high attrition rates remain a key challenge for the pharmaceutical industry, making drug development processes enormously costly and inefficient. Therefore, new preclinical in vitro models which can predict drug responses in vivo more precisely are urgently needed. Tissue engineering not only provides the possibility of creating artificial three-dimensional (3D) in vitro tissues, such as functional organs, but also enables the investigation of drug responses in pathological tissue models, that is, in 3D cancer models which are superior to conventional two-dimensional (2D) cell cultures on petri dishes and can overcome the limitations of animal models, thereby reducing the need for preclinical in vivo models. In this thesis, novel 3D CRC models on the basis of a decellularised intestinal matrix were established. In the first part, it could be shown that the cell line SW480 exhibited different characteristics when grown in a 3D environment from those in conventional 2D culture. While the cells showed a mesenchymal phenotype in 2D culture, they displayed a more pronounced epithelial character in the 3D model. By adding stromal cells (fibroblasts), the cancer cells changed their growth pattern and built tumour-like structures together with the fibroblasts, thereby remodelling the natural mucosal structures of the scaffold. Additionally, the established 3D tumour model was used as a test system for treatment with standard chemotherapeutic 5-fluorouracil (5-FU). The second part of the thesis focused on the establishment of a 3D in vitro test system for targeted therapy. The US Food and Drug Administration has already approved of a number of drugs for targeted therapy of specific types of cancer. For instance, the small molecule vemurafenib (PLX4032, Zelboraf™) which demonstrated impressive response rates of 50–80% in melanoma patients with a mutation of the rapidly accelerated fibrosarcoma oncogene type B (BRAF) kinase which belongs to the mitogen active protein kinase (MAPK) signalling pathway. However, only 5% of CRC patients harbouring the same BRAF mutation respond to treatment with vemurafenib. An explanation for this unresponsiveness could be a feedback activation of the upstream EGFR, reactivating the MAPK pathway which sustains a proliferative signalling. To test this hypothesis, the two early passage cell lines HROC24 and HROC87, both presenting the mutation BRAF V600E but differing in other mutations, were used and their drug response to vemurafenib and/or gefitinib was assessed in conventional 2D cell culture and compared to the more advanced 3D model. Under 3D culture conditions, both cell lines showed a reduction of the proliferation rate only in the combination therapy approach. Furthermore, no significant differences between the various treatment approaches and the untreated control regarding apoptosis rate and viability for both cell lines could be found in the 3D tumour model which conferred an enhanced chemoresistance to the cancer cells. Because of the observed unresponsiveness to BRAF inhibition by vemurafenib as can be seen in the clinic for patients with BRAF mutations in CRC, the cell line HROC87 was used for further xenografting experiments and analysis of activation changes in the MAPK signalling pathway. It could be shown that the cells presented a reactivation of Akt in the 3D model when treated with both inhibitors, suggesting an escape mechanism for apoptosis which was not present in cells cultured under conventional 2D conditions. Moreover, the cells exhibited an activation of the hepatocyte growth factor receptor (HGFR, c-Met) in 2D and 3D culture, but this was not detectable in the xenograft model. This shows the limitations of in vivo models. The results suggest another feedback activation loop than that to the EGFR which might not primarily be involved in the resistance mechanism. This reflects the before mentioned high attrition rates in the preclinical drug testing.
Die NO-sensitive Guanylyl-Cyclase (NO-GC) ist ein zentrales Enzym der NO/cGMP-Signalkaskade, das über die Aktivierung von NO zur Bildung des second messangers cGMP führt. Die NO-GC setzt sich aus zwei Untereinheiten zusammen, sodass zwei Isoformen des Enzyms gebildet werden können (α1β1 und α2β1). Da die genaue Verteilung der beiden Isoformen im Colon nicht bekannt ist, wurde diese im ersten Teil dieser Arbeit charakterisiert. Immunhistochemie und In-situ-Hybridisierung zeigten die Expression beider Isoformen sowohl in der glatten Muskelschicht als auch in der Submukosa und Lamina propria. Dabei war die α1β1-Isoform ubiquitär, die α2β1-Isoform dagegen hauptsächlich im Bereich des myenterischen Plexus vorzufinden.
In der glatten Muskelschicht des Colons ist die NO-GC in glatten Muskelzellen (SMC), interstitiellen Zellen von Cajal (ICC) sowie Fibroblasten-ähnliche Zellen (FLC) exprimiert und hauptsächlich in die Modulation der gastrointestinalen Motilität involviert. Zur spezifischen Charakterisierung der Funktion der NO-GC in den einzelnen Zelltypen wurden Knockout-Mäuse generiert, denen die NO-GC global (GCKO) oder spezifisch in SMC (SMC-GCKO), ICC (ICC-GCKO) oder beiden Zelltypen (SMC/ICC-GCKO) fehlt. Anhand dieser Mausmodelle sollten im zweiten Teil dieser Arbeit die modulatorischen Effekte der NO-GC auf die spontanen Kontraktionen des Colons bestimmt werden. Zur Charakterisierung der spontanen Kontraktionen der zirkulären Muskelschicht wurden Myographiestudien mit 2,5 mm langen Colonringen durchgeführt. Hierbei konnten drei verschiedene Kontraktionen gemessen werden: Kleine, hochfrequente Ripples, mittlere Kontraktionen und große Kontraktionen. Die detaillierte Analyse der einzelnen Kontraktionen zeigte einerseits eine NO-unabhängige Regulation der Ripples, andererseits eine NO-abhängige Modulation der mittleren und großen Kontraktionen über die NO-GC in SMC und ICC. Die NO-GC in SMC beeinflusst die Kontraktionen vermutlich vor allem über die Regulation des Muskeltonus der zirkulären Muskelschicht. Die NO-GC in ICC dagegen modifiziert die spontanen Kontraktionen möglicherweise über eine Veränderung der Schrittmacheraktivität. Allerdings führt erst ein Funktionsverlust des NO/cGMP-Signalweges in beiden Zelltypen zu einem sichtbar veränderten Kontraktionsmuster, das dem von globalen Knockout-Tieren glich. Dies weist auf eine kompensatorische Wirkung der NO-GC im jeweils anderen Zelltyp hin.
Zur Analyse der propulsiven Kontraktionen entlang des gesamten Colons wurden Videoaufnahmen der Darmbewegungen in Kontraktionsmusterkarten transformiert. Zudem wurde der Darm durchspült und die Ausflusstropfen aufgezeichnet, um die Effektivität der Kontraktionen beurteilen zu können. Hierbei zeigte sich, dass eine Beeinträchtigung des NO/cGMP-Signalweges eine verminderte Effektivität der Kontraktionen zur Folge hat und vermutlich durch eine beeinträchtige Synchronisation der Kontraktionen erklärt werden kann. In diesem Regulationsmechanismus konnte vor allem der NO-GC in SMC eine übergeordnete Rolle zugewiesen werden.
Der dritte Teil der Arbeit thematisierte den Befund, dass SMC-GCKO-Tiere ca. 5 Monate nach Tamoxifen-Behandlung Entartungen der Mukosa entwickelten. Diese Entartung war lediglich in Tamoxifen-induzierten Knockout-Tieren vorzufinden. Histologische Analysen identifizierten die Entartungen als tubulovillöses Adenom. Die Genexpressionsanalyse von Mukosafalten von SMC-GCKO- und heterozygoten Kontrolltieren zeigte eine Vielzahl von Genen, welche spezifisch bei colorectalem Karzinom differenziell exprimiert sind. Einer dieser Faktoren war der BMP-Antagonist Gremlin1. Dieser Faktor erschien von besonderem Interesse, da er in Zellen der Lamina muscularis mucosae und kryptennahen Myofibroblasten exprimiert wird. Immunhistochemische Analysen ließen vermuten, dass diese Zellen sowohl die NO-GC als auch die Cre-Rekombinase unter dem SMMHC-Promotor exprimieren. Diese Arbeit liefert demnach Hinweise darauf, dass die NO-GC einen wichtigen Regulator innerhalb der Stammzellnische bildet. Die Deletion der NO-GC führt vermutlich zu einer verstärkten Bildung bzw. Sekretion von Gremlin1, was die Homöostase der mukosalen Erneuerung stört und somit zur Entwicklung von Adenomen führt.
Die vorliegende Studie liefert in drei gleichrangigen Teilen empirische Befunde zu den Steuern und Beiträgen auf lokaler Ebene.
In den ersten beiden Teilen wird die Realsteuerpolitik deutscher Kommunen quantitativ datenempirisch und qualitativ in Form einer Expertenbefragung untersucht. Hierbei wird insbesondere der Frage nachgegangen, welche Determinanten das gemeindliche Hebesatzniveau bei der Gewerbesteuer und den Grundsteuern A und B bestimmen.
Der dritte Teil analysiert die Beitragseinnahmen der Industrie- und Handelskammern. Der IHK-Beitrag ist deren zentrale Einnahmeposition und knüpft ebenfalls an der gewerbesteuerlichen Bemessungsgrundlage an. Die Abhängigkeit von einer zum Teil volatilen Bemessungsgrundlage stellt die Kammern bei ihrer Budgetplanung vor große Herausforderungen. Zur Steigerung der Planungsgenauigkeit wurde ein Prognosemodell entwickelt, das einen präziseren Rückschluss auf künftige Beitragseinnahmen zulässt.
Almost all life forms on earth have adapted to the most impactful and most predictable recurring change in environmental condition, the cycle of day and night, caused by the axial rotation of the planet. As a result many animals have evolved intricate endogenous clocks, which adapt and synchronize the organisms’ physiology, metabolism and behaviour to the daily change in environmental conditions. The scientific field researching these endogenous clocks is called chronobiology and has steadily grown in size, scope and relevance since the works of the earliest pioneers in the 1960s.
The number one model organism for the research of circadian clocks is the fruit fly, Drosophila melanogaster, whose clock serves as the entry point to understanding the basic inner workings of such an intricately constructed endogenous timekeeping system. In this thesis it was attempted to combine the research on the circadian clock with the techniques of optogenetics, a fairly new scientific field, launched by the discovery of Channelrhodopsin 2 just over 15 years ago. Channelrhodopsin 2 is a light-gated ion channel found in the green alga Chlamydomonas reinhardtii. In optogenetics, researches use these light-gated ion channels like Channelrhodopsin 2 by heterologously expressing them in cells and tissues of other organisms, which can then be stimulated by the application of light. This is most useful when studying neurons, as these channels provide an almost non-invasive tool to depolarize the neuronal plasma membranes at will. The goal of this thesis was to develop an optogenetic tool, which would be able to influence and phase shift the circadian clock of Drosophila melanogaster upon illumination. A phase shift is the adaptive response of the circadian clock to an outside stimulus that signals a change in the environmental light cycle. An optogenetic tool, able to influence and phase shift the circadian clock predictably and reliably, would open up many new ways and methods of researching the neuronal network of the clock and which neurons communicate to what extent, ultimately synchronizing the network.
The first optogenetic tool to be tested in the circadian clock of Drosophila melanogaster was ChR2-XXL, a channelrhodopsin variant with dramatically increased expression levels and photocurrents combined with a prolonged open state. The specific expression of ChR2-XXL and of later constructs was facilitated by deploying the three different clock-specific GAL4-driver lines, clk856-gal4, pdf-gal4 and mai179-gal4. Although ChR2-XXL was shown to be highly effective at depolarizing neurons, these stimulations proved to be unable to significantly phase shift the circadian clock of Drosophila. The second series of experiments was conducted with the conceptually novel optogenetic tools Olf-bPAC and SthK-bPAC, which respectively combine a cyclic nucleotide-gated ion channel (Olf and SthK) with the light-activated adenylyl-cyclase bPAC. These tools proved to be quite useful when expressed in the motor neurons of instar-3 larvae of Drosophila, paralyzing the larvae upon illumination, as well as affecting body length. This way, these new tools could be precisely characterized, spawning a successfully published research paper, centered around their electrophysiological characterization and their applicability in model organisms like Drosophila. In the circadian clock however, these tools caused substantial damage, producing severe arrhythmicity and anomalies in neuronal development. Using a temperature-sensitive GAL80-line to delay the expression until after the flies had eclosed, yielded no positive results either. The last series of experiments saw the use of another new series of optogenetic tools, modelled after the Olf-bPAC, with bPAC swapped out for CyclOp, a membrane-bound guanylyl-cyclase, coupled with less potent versions of the Olf. This final attempt however also ended up being unsuccessful. While these tools could efficiently depolarize neuronal membranes upon illumination, they were ultimately unable to stimulate the circadian clock in way that would cause it to phase shift.
Taken together, these mostly negative results indicate that an optogenetic manipulation of the circadian clock of Drosophila melanogaster is an extremely challenging subject. As light already constitutes the most impactful environmental factor on the circadian clock, the combination of chronobiology with optogenetics demands the parameters of the conducted experiments to be tuned with an extremely high degree of precision, if one hopes to receive positive results from these types of experiments at all.
Life on earth adapted to the daily reoccurring changes in environment by evolving an endogenous circadian clock. Although the circadian clock has a crucial impact on survival and behavior of solitary bees, many aspects of solitary bee clock mechanisms remain unknown. Our study is the first to show that the circadian clock governs emergence in Osmia bicornis, a bee species which overwinters as adult inside its cocoon. Therefore, its eclosion from the pupal case is separated by an interjacent diapause from its emergence in spring. We show that this bee species synchronizes its emergence to the morning. The daily rhythms of emergence are triggered by temperature cycles but not by light cycles. In contrast to this, the bee’s daily rhythms in locomotion are synchronized by light cycles. Thus, we show that the circadian clock of O. bicornis is set by either temperature or light, depending on what activity is timed. Light is a valuable cue for setting the circadian clock when bees have left the nest. However, for pre-emerged bees, temperature is the most important cue, which may represent an evolutionary adaptation of the circadian system to the cavity-nesting life style of O. bicornis.
Nectin‐2 is an adhesion molecule that has been reported to play a role in tumor growth, metastasis and tumor angiogenesis. Herein, we investigated Nectin‐2 in ovarian cancer patients and in cell culture. Tumor as well as peritoneal biopsies of 60 ovarian cancer patients and 22 controls were dual stained for Nectin‐2 and CD31 using immunohistochemistry. Gene expression of Nectin‐2 was quantified by real‐time PCR and differences analyzed in relation to various tumor characteristics. In the serum of patients, vascular endothelial growth factor (VEGF) was quantified by ELISA. Effect of VEGF on Nectin‐2 expression as well as permeability was investigated in HUVEC. In tumor biopsies, Nectin‐2 protein was mainly localized in tumor cells, whereas in peritoneal biopsies, clear colocalization was found in the vasculature. T3 patients had a significantly higher percentage of positive lymph nodes and this correlated with survival. Nectin‐2 was significantly upregulated in tumor biopsies in patients with lymph node metastasis and with residual tumor >1 cm after surgery. Nectin‐2 expression was significantly suppressed in the peritoneal endothelium of patients associated with significantly increased VEGF serum levels. In cell culture, VEGF stimulation led to a significant downregulation of Nectin‐2 which was reversed by VEGF‐inhibition. In addition, Nectin‐2 knockdown in endothelial cells was associated with significantly increased endothelial permeability. Nectin‐2 expression in ovarian cancer may support tumor cell adhesion, leading to growth and lymph node metastasis. In addition, VEGF‐induced Nectin‐2 suppression in peritoneal endothelium may support an increase in vascular permeability leading to ascites production.
The photophysical properties (absorption, fluorescence and phosphorescence) of a series of triarylboranes of the form 4-D-C\(_6\)H\(_4\)-B(Ar)\(_2\) (D=\(^t\)Bu or NPh\(_2\); Ar=mesityl (Mes) or 2,4,6-tris(trifluoromethylphenyl (Fmes)) were analyzed theoretically using state-of-the-art DFT and TD-DFT methods. Simulated emission spectra and computed decay rate constants are in very good agreement with the experimental data. Unrestricted electronic computations including vibronic contributions explain the unusual optical behavior of 4-\(^t\)Bu-C\(_6\)H\(_4\)-B(Fmes)\(_2\) 2, which shows both fluorescence and phosphorescence at nearly identical energies (at 77 K in a frozen glass). Analysis of the main normal modes responsible for the phosphorescence vibrational fine structure indicates that the bulky tert-butyl group tethered to the phenyl ring is strongly involved. Interestingly, in THF solvent, the computed energies of the singlet and triplet excited states are very similar for compound 2 only, which may explain why 2 shows phosphorescence in contrast to the other members of the series.
Understanding the mechanisms of early invasion and epithelial defense in opportunistic mold infections is crucial for the evaluation of diagnostic biomarkers and novel treatment strategies. Recent studies revealed unique characteristics of the immunopathology of mucormycoses. We therefore adapted an alveolar Transwell® A549/HPAEC bilayer model for the assessment of epithelial barrier integrity and cytokine response to Rhizopus arrhizus, Rhizomucor pusillus, and Cunninghamella bertholletiae. Hyphal penetration of the alveolar barrier was validated by 18S ribosomal DNA detection in the endothelial compartment. Addition of dendritic cells (moDCs) to the alveolar compartment led to reduced fungal invasion and strongly enhanced pro-inflammatory cytokine response, whereas epithelial CCL2 and CCL5 release was reduced. Despite their phenotypic heterogeneity, the studied Mucorales species elicited the release of similar cytokine patterns by epithelial and dendritic cells. There were significantly elevated lactate dehydrogenase concentrations in the alveolar compartment and epithelial barrier permeability for dextran blue of different molecular weights in Mucorales-infected samples compared to Aspergillus fumigatus infection. Addition of monocyte-derived dendritic cells further aggravated LDH release and epithelial barrier permeability, highlighting the influence of the inflammatory response in mucormycosis-associated tissue damage. An important focus of this study was the evaluation of the reproducibility of readout parameters in independent experimental runs. Our results revealed consistently low coefficients of variation for cytokine concentrations and transcriptional levels of cytokine genes and cell integrity markers. As additional means of model validation, we confirmed that our bilayer model captures key principles of Mucorales biology such as accelerated growth in a hyperglycemic or ketoacidotic environment or reduced epithelial barrier invasion upon epithelial growth factor receptor blockade by gefitinib. Our findings indicate that the Transwell® bilayer model provides a reliable and reproducible tool for assessing host response in mucormycosis.
Background: Culturing of cells is typically performed on standard tissue culture plates generating growth conditions, which in general do not reflect the native three-dimensional cellular environment. Recent investigations provide insights in parameters, which strongly affect the general cellular behavior triggering essential processes such as cell differentiation. The physical properties of the used material, such as stiffness, roughness, or topology, as well as the chemical composition of the cell-surface interface are shown to play a key role in the initiation of particular cellular responses. Methods: We extended our previous research, which identified thin films of metallo-supramolecular coordination polyelectrolytes (MEPEs) as substrate to trigger the differentiation of muscular precursor cells. Results: Here, we show that the same MEPEs similarly stimulate the osteogenic differentiation of pre-osteoblasts. Remarkably, MEPE modified surfaces also trigger the differentiation of primary bone derived mesenchymal stem cells (BMSCs) towards the osteogenic lineage. Conclusion: This result leads to the conclusion that these surfaces individually support the specification of cell differentiation toward lineages that correspond to the natural commitment of the particular cell types. We, therefore, propose that Fe-MEPEs may be used as scaffold for the treatment of defects at least in muscular or bone tissue.
Ziel der vorliegenden Arbeit war die Herstellung und Erprobung von innovativen Anwendungsformen kalthärtender Knochenersatzmaterialien aus Calcium-, und Magnesiumphosphaten, die nach dem Abbindevorgang vorzugsweise aus dem Mineral Struvit (MgNH4PO4·6H2O) bestehen. Diese neuartigen Knochenzemente versprechen im Vergleich zu den herkömmlichen Knochenersatzmaterialien eine deutlich schnellere knöcherne Regeneration und Abbaubarkeit. Damit wird das Ziel verfolgt schneller Implantate setzen zu können und dem Patienten somit eine lange Wartezeit und dementsprechenden Leidensdruck ersparen zu können. Ebenso müssen konventionelle Produkte erst im OP angerührt und hiernach in einem schmalen Zeitfenser verarbeitet werden. Die präfabrizierten Zement-Pasten sind dagegen direkt applikationsbereit und härten erst nach Kontakt mit dem feuchten Milieu aus. In vorangegangenen Projekten wurden sowohl präfabrizierte Pasten als auch Granulate auf Basis Struvit-bildender Calcium-Magnesiumphosphate erfolgreich entwickelt. Vorteil dieser Granulate ist ihre sphärische Form. Im Hinblick auf die klinische Anwendbarkeit sollten in der vorliegenden Studie beide Anwendungsformen vorgreifend auf eine tierexperimentelle Studie hinsichtlich ihrer Materialeigenschaften in vitro getestet werden.