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- Physikalisches Institut (99)
- Theodor-Boveri-Institut für Biowissenschaften (84)
- Graduate School of Life Sciences (81)
- Universität - Fakultätsübergreifend (47)
- Klinik und Poliklinik für Nuklearmedizin (34)
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- Klinik und Poliklinik für Psychiatrie, Psychosomatik und Psychotherapie (32)
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- Medizinische Klinik und Poliklinik II (26)
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Schriftenreihe
Sonstige beteiligte Institutionen
- Johns Hopkins School of Medicine (15)
- Johns Hopkins University School of Medicine (5)
- Department of Biomedical Imaging, National Cerebral and Cardiovascular Research Center, Suita, Japan (2)
- Division of Medical Technology and Science, Department of Medical Physics and Engineering, Course of Health Science, Osaka University Graduate School of Medicine, Suita Japan (2)
- Institut for Molecular Biology and CMBI, Department of Genomics, Stem Cell Biology and Regenerative Medicine, Leopold-Franzens-University Innsbruck, Innsbruck, Austria (2)
- International Max Planck Research School Molecular Biology, University of Göttingen, Germany (2)
- Johns Hopkins School of Medicine, The Russell H Morgan Department of Radiology and Radiological Science, Baltimore, MD, USA (2)
- Universitätsklinikum Würzburg (2)
- ACC GmbH Analytical Clinical Concepts (1)
- Abteilung für Molekulare Onkoimmunologie (1)
ResearcherID
- J-8841-2015 (1)
Background
Percutaneous mitral valve repair (PMVR) is increasingly performed in patients with severe mitral regurgitation (MR). Post-procedural MR grading is challenging and an unsettled issue. We hypothesised that the direct planimetry of vena contracta area (VCA) by 3D–transoesophageal echocardiography allows quantifying post-procedural MR and implies further prognostic relevance missed by the usual ordinal scale (grade I-IV).
Methods
Based on a single-centre PMVR registry containing 102 patients, the association of VCA reduction and patients’ functional capacity measured as six-minute walk distance (6 MW) was evaluated. 3D–colour-Doppler datasets were available before, during and 4 weeks after PMVR.
Results
Twenty nine patients (age 77.0 ± 5.8 years) with advanced heart failure (75.9% NYHA III/IV) and severe degenerative (34%) or functional (66%) MR were eligible. VCA was reduced in all patients by PMVR (0.99 ± 0.46 cm\(^2\) vs. 0.22 ± 0.15 cm\(^2\), p < 0.0001). It remained stable after median time of 33 days (p = 0.999). 6 MW improved after the procedure (257.5 ± 82.5 m vs. 295.7 ± 96.3 m, p < 0.01). Patients with a decrease in VCA less than the median VCA reduction showed a more distinct improvement in 6 MW than patients with better technical result (p < 0.05). This paradoxical finding was driven by inferior results in very large functional MR.
Conclusions
VCA improves the evaluation of small residual MR. Its post-procedural values remain stable during a short-term follow-up and imply prognostic information for the patients’ physical improvement. VCA might contribute to a more substantiated estimation of treatment success in the heterogeneous functional MR group.
Measurements of ZZ production in the l(+)l(-)l'(+)l'(-) channel in proton-proton collisions at 13 TeV center-of-mass energy at the Large Hadron Collider are presented. The data correspond to 36.1 fb(-1) of collisions collected by the ATLAS experiment in 2015 and 2016. Here l and l ' stand for electrons or muons. Integrated and differential ZZ -> l(+)l(-)l'(+)l'(-) cross sections with Z -> l(+)l(-) candidate masses in the range of 66 GeV to 116 GeV are measured in a fiducial phase space corresponding to the detector acceptance and corrected for detector effects. The differential cross sections are presented in bins of twenty observables, including several that describe the jet activity. The integrated cross section is also extrapolated to a total phase space and to all standard model decays of Z bosons with mass between 66 GeV and 116 GeV, resulting in a value of 17.3 +/- 0.9 [+/- 0.6(start) +/- 0.5 (syst) +/- 0.6 (lumi)] pb. The measurements are found to be in good agreement with the standard model. A search for neutral triple gauge couplings is performed using the transverse momentum distribution of the leading Z boson candidate. No evidence for such couplings is found and exclusion limits are set on their parameters.
The present study was designed to assess the psycho-physiological responses of physically untrained individuals to mobile-based multi-stimulating, circuit-like, multiple-joint conditioning (Circuit\(_{HIIT}\)) performed either once (1xCircuitHIIT) or twice (2xCircuit\(_{HIIT}\)) daily for 4 weeks. In this single-center, two-arm randomized, controlled study, 24 men and women (age: 25 ± 5 years) first received no training instructions for 4 weeks and then performed 4 weeks of either 1xCircuitHIIT or 2xCircuit\(_{HIIT}\) (5 men and 7 women in each group) daily. The 1xCircuitHIIT and 2xCircuit\(_{HIIT}\) participants carried out 90.7 and 85.7% of all planned training sessions, respectively, with average heart rates during the 6-min sessions of 74.3 and 70.8% of maximal heart rate. Body, fat and fat-free mass, and metabolic rate at rest did not differ between the groups or between time-points of measurement. Heart rate while running at 6 km⋅h\(^{-1}\) declined after the intervention in both groups. Submaximal and peak oxygen uptake, the respiratory exchange ratio and heart rate recovery were not altered by either intervention. The maximal numbers of push-ups, leg-levers, burpees, 45°-one-legged squats and 30-s skipping, as well as perception of general health improved in both groups. Our 1xCircuit\(_{HIIT}\) or 2xCircuit\(_{HIIT}\) interventions improved certain parameters of functional strength and certain dimensions of quality of life in young untrained individuals. However, they were not sufficient to enhance cardio-respiratory fitness, in particular peak oxygen uptake.
A comparative view on sex differentiation and gametogenesis genes in lungfish and coelacanths
(2018)
Gonadal sex differentiation and reproduction are the keys to the perpetuation of favorable gene combinations and positively selected traits. In vertebrates, several gonad development features that differentiate tetrapods and fishes are likely to be, at least in part, related to the water-to-land transition. The collection of information from basal sarcopterygians, coelacanths, and lungfishes, is crucial to improve our understanding of the molecular evolution of pathways involved in reproductive functions, since these organisms are generally regarded as “living fossils” and as the direct ancestors of tetrapods. Here, we report for the first time the characterization of >50 genes related to sex differentiation and gametogenesis in Latimeria menadoensis and Protopterus annectens. Although the expression profiles of most genes is consistent with the intermediate position of basal sarcopterygians between actinopterygian fish and tetrapods, their phylogenetic placement and presence/absence patterns often reveal a closer affinity to the tetrapod orthologs. On the other hand, particular genes, for example, the male gonad factor gsdf (Gonadal Soma-Derived Factor), provide examples of ancestral traits shared with actinopterygians, which disappeared in the tetrapod lineage.
The modulation of an animal’s behavior through external sensory stimuli, previous experience and its internal state is crucial to survive in a constantly changing environment. In most insects, octopamine (OA) and its precursor tyramine (TA) modulate a variety of physiological processes and behaviors by shifting the organism from a relaxed or dormant condition to a responsive, excited and alerted state. Even though OA/TA neurons of the central brain are described on single cell level in Drosophila melanogaster, the periphery was largely omitted from anatomical studies. Given that OA/TA is involved in behaviors like feeding, flying and locomotion, which highly depend on a variety of peripheral organs, it is necessary to study the peripheral connections of these neurons to get a complete picture of the OA/TA circuitry. We here describe the anatomy of this aminergic system in relation to peripheral tissues of the entire fly. OA/TA neurons arborize onto skeletal muscles all over the body and innervate reproductive organs, the heart, the corpora allata, and sensory organs in the antennae, legs, wings and halteres underlining their relevance in modulating complex behaviors.
This dissertation contributes to the empirical analysis of economic development. The continuing poverty in many Sub-Saharan-African countries as well as the declining trend in growth in the advanced economies that was initiated around the turn of the millennium raises a number of new questions which have received little attention in recent empirical studies. Is culture a decisive factor for economic development? Do larger financial markets trigger positive stimuli with regard to incomes, or is the recent increase in their size in advanced economies detrimental to economic growth? What causes secular stagnation, i.e. the reduction in growth rates of the advanced economies observable over the past 20 years? What is the role of inequality in the growth process, and how do governmental attempts to equalize the income distribution affect economic development? And finally: Is the process of democratization accompanied by an increase in living standards? These are the central questions of this doctoral thesis.
To facilitate the empirical analysis of the determinants of economic growth, this dissertation introduces a new method to compute classifications in the field of social sciences. The approach is based on mathematical algorithms of machine learning and pattern recognition. Whereas the construction of indices typically relies on arbitrary assumptions regarding the aggregation strategy of the underlying attributes, utilization of Support Vector Machines transfers the question of how to aggregate the individual components into a non-linear optimization problem.
Following a brief overview of the theoretical models of economic growth provided in the first chapter, the second chapter illustrates the importance of culture in explaining the differences in incomes across the globe. In particular, if inhabitants have a lower average degree of risk-aversion, the implementation of new technology proceeds much faster compared with countries with a lower tendency towards risk. However, this effect depends on the legal and political framework of the countries, their average level of education, and their stage of development.
The initial wealth of individuals is often not sufficient to cover the cost of investments in both education and new technologies. By providing loans, a developed financial sector may help to overcome this shortage. However, the investigations in the third chapter show that this mechanism is dependent on the development levels of the economies. In poor countries, growth of the financial sector leads to better education and higher investment levels. This effect diminishes along the development process, as intermediary activity is increasingly replaced by speculative transactions. Particularly in times of low technological innovation, an increasing financial sector has a negative impact on economic development. In fact, the world economy is currently in a phase of this kind. Since the turn of the millennium, growth rates in the advanced economies have experienced a multi-national decline, leading to an intense debate about "secular stagnation" initiated at the beginning of 2015. The fourth chapter deals with this phenomenon and shows that the growth potentials of new technologies have been gradually declining since the beginning of the 2000s.
If incomes are unequally distributed, some individuals can invest less in education and technological innovations, which is why the fifth chapter identifies an overall negative effect of inequality on growth. This influence, however, depends on the development level of countries. While the negative effect is strongly pronounced in poor economies with a low degree of equality of opportunity, this influence disappears during the development process. Accordingly, redistributive polices of governments exert a growth-promoting effect in developing countries, while in advanced economies, the fostering of equal opportunities is much more decisive.
The sixth chapter analyzes the growth effect of the political environment and shows that the ambiguity of earlier studies is mainly due to unsophisticated measurement of the degree of democratization. To solve this problem, the chapter introduces a new method based on mathematical algorithms of machine learning and pattern recognition. While the approach can be used for various classification problems in the field of social sciences, in this dissertation it is applied for the problem of democracy measurement. Based on different country examples, the chapter shows that the resulting SVMDI is superior to other indices in modeling the level of democracy. The subsequent empirical analysis emphasizes a significantly positive growth effect of democracy measured via SVMDI.
The human pathogenic fungus Candida albicans can switch between yeast and hyphal morphologies as a function of environmental conditions and cellular physiology. The yeast-to-hyphae morphogenetic switch is activated by well-established, kinase-based signal transduction pathways that are induced by extracellular stimuli. In order to identify possible inhibitory pathways of the yeast-to-hyphae transition, we interrogated a collection of C. albicans protein kinases and phosphatases ectopically expressed under the regulation of the TETon promoter. Proportionately more phosphatases than kinases were identified that inhibited hyphal morphogenesis, consistent with the known role of protein phosphorylation in hyphal induction. Among the kinases, we identified AKL1 as a gene that significantly suppressed hyphal morphogenesis in serum. Akl1 specifically affected hyphal elongation rather than initiation: overexpression of AKL1 repressed hyphal growth, and deletion of AKL1 resulted in acceleration of the rate of hyphal elongation. Akl1 suppressed fluid-phase endocytosis, probably via Pan1, a putative clathrin-mediated endocytosis scaffolding protein. In the absence of Akl1, the Pan1 patches were delocalized from the sub-apical region, and fluid-phase endocytosis was intensified. These results underscore the requirement of an active endocytic pathway for hyphal morphogenesis. Furthermore, these results suggest that under standard conditions, endocytosis is rate-limiting for hyphal elongation.
While our knowledge about the roles of microbes and viruses in the ocean has increased tremendously due to recent advances in genomics and metagenomics, research on marine microbial eukaryotes and zooplankton has benefited much less from these new technologies because of their larger genomes, their enormous diversity, and largely unexplored physiologies. Here, we use a metatranscriptomics approach to capture expressed genes in open ocean Tara Oceans stations across four organismal size fractions. The individual sequence reads cluster into 116 million unigenes representing the largest reference collection of eukaryotic transcripts from any single biome. The catalog is used to unveil functions expressed by eukaryotic marine plankton, and to assess their functional biogeography. Almost half of the sequences have no similarity with known proteins, and a great number belong to new gene families with a restricted distribution in the ocean. Overall, the resource provides the foundations for exploring the roles of marine eukaryotes in ocean ecology and biogeochemistry.
Background
With upcoming therapeutic interventions for patients with primary progressive aphasia (PPA), instruments for the follow-up of patients are needed to describe disease progression and to evaluate potential therapeutic effects. So far, volumetric brain changes have been proposed as clinical endpoints in the literature, but cognitive scores are still lacking. This study followed disease progression predominantly in language-based performance within 1 year and defined a PPA sum score which can be used in therapeutic interventions.
Methods
We assessed 28 patients with nonfluent variant PPA, 17 with semantic variant PPA, 13 with logopenic variant PPA, and 28 healthy controls in detail for 1 year. The most informative neuropsychological assessments were combined to a sum score, and associations between brain atrophy were investigated followed by a sample size calculation for clinical trials.
Results
Significant absolute changes up to 20% in cognitive tests were found after 1 year. Semantic and phonemic word fluency, Boston Naming Test, Digit Span, Token Test, AAT Written language, and Cookie Test were identified as the best markers for disease progression. These tasks provide the basis of a new PPA sum score. Assuming a therapeutic effect of 50% reduction in cognitive decline for sample size calculations, a number of 56 cases is needed to find a significant treatment effect. Correlations between cognitive decline and atrophy showed a correlation up to r = 0.7 between the sum score and frontal structures, namely the superior and inferior frontal gyrus, as well as with left-sided subcortical structures.
Conclusion
Our findings support the high performance of the proposed sum score in the follow-up of PPA and recommend it as an outcome measure in intervention studies.
Large Stokes shift (LSS) fluorescent proteins (FPs) exploit excited state proton transfer pathways to enable fluorescence emission from the phenolate intermediate of their internal 4 hydroxybenzylidene imidazolone (HBI) chromophore. An RNA aptamer named Chili mimics LSS FPs by inducing highly Stokes-shifted emission from several new green and red HBI analogs that are non-fluorescent when free in solution. The ligands are bound by the RNA in their protonated phenol form and feature a cationic aromatic side chain for increased RNA affinity and reduced magnesium dependence. In combination with oxidative functional-ization at the C2 position of the imidazolone, this strategy yielded DMHBO\(^+\), which binds to the Chili aptamer with a low-nanomolar K\(_D\). Because of its highly red-shifted fluorescence emission at 592 nm, the Chili–DMHBO\(^+\) complex is an ideal fluorescence donor for Förster resonance energy transfer (FRET) to the rhodamine dye Atto 590 and will therefore find applications in FRET-based analytical RNA systems.
Whereas G-protein coupled receptors (GPCRs) have been long believed to signal through cyclic AMP exclusively at cell surface, our group has previously shown that GPCRs not only signal at the cell surface but can also continue doing so once internalized together with their ligands, leading to persistent cAMP production. This phenomenon, which we originally described for the thyroid stimulating hormone receptor (TSHR) in thyroid cells, has been observed also for other GPCRs. However, the intracellular compartment(s) responsible for such persistent signaling and its consequences on downstream effectors were insufficiently characterized. The aim of this study was to follow by live-cell imaging the trafficking of internalized TSHRs and other involved signaling proteins as well as to understand the consequences of signaling by internalized TSHRs on the downstream activation of protein kinase A (PKA). cAMP and PKA
activity was measured in real-time in living thyroid cells using FRET-based sensors Epac1-camp and AKAR2 respectively. The results suggest that TSH co-internalizes with its receptor and that the internalized TSH/TSHR complexes traffic retrogradely to the trans-Golgi network (TGN). This study also provides evidence that these internalized TSH/TSHR complexes meet an intracellular pool of Gs proteins in sorting endosomes and in TGN and activate it there, as visualized in real-time using a conformational biosensor nanobody, Nb37. Acute Brefeldin A-induced Golgi collapse hinders the retrograde trafficking of TSH/TSHR complexes, leading to reduced cAMP production and PKA signaling. BFA pretreatment was also able to attenuate CREB phosphorylation suggesting that an intact Golgi/TGN organisation is essential
for an efficient cAMP/PKA signaling by internalized TSH/TSHR complexes. Taken together this data provides evidence that internalized TSH/TSHR complexes meet and activate Gs proteins in sorting endosomes and at the TGN, leading to a local activation of PKA and consequently increased CREB activation. These findings suggest unexpected functions for receptor internalization, with major pathophysiological and pharmacological implications.
Background:
The presented prospective randomized controlled single-centre study compares the clinical outcome up to 12 months after total hip arthroplasty using a minimally invasive single-incision direct anterior (DAA) and a direct transgluteal lateral approach.
Methods:
A total of 123 arthroplasties were evaluated utilizing the Harris Hip Score (HHS), the extra short musculoskeletal functional assessment questionnaire (XSFMA), the Short Form 36 (SF-36) health survey, a Stepwatch™ Activity Monitor (SAM), and a timed 25 m foot walk (T25-FW). Postoperative x-ray images after THA were reviewed to determine inclination and stem positioning.
Results:
At final follow-up, the XSFMA functional index scores were 10.3 (anterior) and 15.08 (lateral) while the bother index summed up to a score of 15.8 (anterior) and 21.66 (lateral) respectively, thus only differing significantly for the functional index (p = 0.040 and p = 0.056). The SF-36 physical component score (PCS) was 47.49 (anterior) and 42.91 (lateral) while the mental component score (MCS) summed up to 55.0 (anterior) and 56.23 (lateral) with a significant difference evident for the PCS (p = 0.017; p = 0.714). Patients undergoing THA through a DAA undertook a mean of 6402 cycles per day while those who had undergone THA through a transgluteal approach undertook a mean of 5340 cycles per day (p = 0.012). Furthermore, the obtained outcome for the T25-FW with 18.4 s (anterior) and 19.75 s (lateral) and the maximum walking distance (5932 m and 5125 m) differed significantly (p = 0.046 and p = 0.045). The average HHS showed no significant difference equaling 92.4 points in the anterior group and 91.43 in the lateral group (p = 0.477). The radiographic analysis revealed an average cup inclination of 38.6° (anterior) and 40.28° (lateral) without signs of migration.
Conclusion:
In summary, our outcomes show that after 1 year THA through the direct anterior approach results in a higher patient activity compared to THA utilizing a transgluteal lateral approach while no differences regarding hip function are evident.
A search for massive coloured resonances which are pair-produced and decay into two jets is presented. The analysis uses 36.7 fb(-1) of root s = 13 TeV pp collision data recorded by the ATLAS experiment at the LHC in 2015 and 2016. No significant deviation from the background prediction is observed. Results are interpreted in a SUSY simplified model where the lightest supersymmetric particle is the top squark, (t) over tilde, which decays promptly into two quarks through R-parity-violating couplings. Top squarks with masses in the range 100 GeV < m((T) over tilde) < 410 GeV are excluded at 95% confidence level. If the decay is into a b-quark and a light quark, a dedicated selection requiring two b-tags is used to exclude masses in the ranges 100 GeV < m((t) over tilde) < 470 GeV and 480 GeV < m(<(t)over tilde>) < 610 GeV. Additional limits are set on the pair-production of massive colour-octet resonances.
A search for heavy resonances decaying into a Higgs boson (H) and a new particle (X) is reported, utilizing 36.1 fb(-1) of proton-proton collision data at root s = 13 TeV collected during 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. The particle Xis assumed to decay to a pair of light quarks, and the fully hadronic final state XH -> q (q) over bar 'b (b) over bar is analysed. The search considers the regime of high XH resonance masses, where the X and H bosons are both highly Lorentz-boosted and are each reconstructed using a single jet with large radius parameter. A two-dimensional phase space of XH mass versus X mass is scanned for evidence of a signal, over a range of XH resonance mass values between 1 TeV and 4 TeV, and for X particles with masses from 50 GeV to 1000 GeV. All search results are consistent with the expectations for the background due to Standard Model processes, and 95% CL upper limits are set, as a function of XH and X masses, on the production cross-section of the XH -> q (q) over bar 'b (b) over bar resonance. (c) 2018 The Author(s). Published by Elsevier B.V.
Pacemaker systems are an essential tool for the treatment of cardiovascular diseases. However, the immune system’s natural response to a foreign body results in the encapsulation of a pacemaker electrode and an impaired energy efficiency by increasing the excitation threshold. The integration of the electrode into the tissue is affected by implant properties such as size, mechanical flexibility, shape, and dimensionality. Three-dimensional, tissue-like electrode scaffolds render an alternative to currently used planar metal electrodes. Based on a modified electrospinning process and a high temperature treatment, a conductive, porous fiber scaffold was fabricated. The electrical and immunological properties of this 3D electrode were compared to 2D TiN electrodes. An increased surface of the fiber electrode compared to the planar 2D electrode, showed an enhanced electrical performance. Moreover, the migration of cells into the 3D construct was observed and a lower inflammatory response was induced. After early and late in vivo host response evaluation subcutaneously, the 3D fiber scaffold showed no adverse foreign body response. By embedding the 3D fiber scaffold in human cardiomyocytes, a tissue-electrode hybrid was generated that facilitates a high regenerative capacity and a low risk of fibrosis. This hybrid was implanted onto a spontaneously beating, tissue-engineered human cardiac patch to investigate if a seamless electronic-tissue interface is generated. The fusion of this hybrid electrode with a cardiac patch resulted in a mechanical stable and electrical excitable unit. Thereby, the feasibility of a seamless tissue-electrode interface was proven.
G-protein-coupled receptors (GPCRs) represent one of the most important classes of drug targets. The discovery of new GCPR therapeutics would greatly benefit from the development of a generalizable high-throughput assay to directly monitor their activation or de-activation. Here we screened a variety of labels inserted into the third intracellular loop and the C-terminus of the alpha(2 Lambda)-adrenergic receptor and used fluorescence (FRET) and bioluminescence resonance energy transfer (BRET) to monitor ligand-binding and activation dynamics. We then developed a universal intramolecular BRET receptor sensor design to quantify efficacy and potency of GPCR ligands in intact cells and real time. We demonstrate the transferability of the sensor design by cloning beta(2)-adrenergic and PTH1-receptor BRET sensors and monitored their efficacy and potency. For all biosensors, the Z factors were well above 0.5 showing the suitability of such design for microtiter plate assays. This technology will aid the identification of novel types of GPCR ligands.
The desymmetrization of the cyclic (alkyl)(amino)carbene-supported diboracumulene, B\(_2\)(cAAC\(^{Me}\))\(_2\) (cAAC\(^{Me}\) = 1- (2,6-diisopropylphenyl)-3,3,5,5-tetramethylpyrrolidin-2-ylidene) by mono-adduct formation with IMe\(^{Me}\) (1,3-dimethylimidazol-2-ylidene) yields the zerovalent sp-sp\(^2\) diboron compound B\(_2\)(cAAC\(^{Me}\))\(_2\)(IMe\(^{Me}\)), which provides a versatile platform for the synthesis of novel symmetrical and unsymmetrical zerovalent sp\(^2\)-sp\(^2\) diboron compounds by adduct formation with IMe\(^{Me}\) and CO, respectively. Furthermore, B\(_2\)(cAAC\(^{Me}\))\(_2\)(IMe\(^{Me}\)) displays enhanced reactivity compared to its symmetrical precursor, undergoing spontaneous intramolecular C-H activation and facile twofold hydrogenation, the latter resulting in B-B bond cleavage and the formation of the mixed-base parent borylene, (cAAC\(^{Me}\))(IMe\(^{Me}\))BH.
The anti-oxidative enzyme, glutathione peroxidase 4 (GPX4), helps to promote inflammation resolution by eliminating oxidative species produced by the arachidonic acid (AA) metabolic network. Up-regulating its activity has been proposed as a promising strategy for inflammation intervention. In the present study, we aimed to study the effect of GPX4 activator on the AA metabolic network and inflammation related pathways. Using combined computational and experimental screen, we identified a novel compound that can activate the enzyme activity of GPX4 by more than two folds. We further assessed its potential in a series of cellular assays where GPX4 was demonstrated to play a regulatory role. We are able to show that GPX4 activation suppressed inflammatory conditions such as oxidation of AA and NF-κB pathway activation. We further demonstrated that this GPX4 activator can decrease the intracellular ROS level and suppress ferroptosis. Our study suggests that GPX4 activators can be developed as anti-inflammatory or cyto-protective agent in lipid-peroxidation-mediated diseases.
Additive Fertigung – oftmals plakativ „3D-Druck“ genannt – bezeichnet eine Fertigungstechnologie, die die Herstellung physischer Gegenstände auf Basis digitaler, dreidimensionaler Modelle ermöglicht. Das grundlegende Funktionsprinzip und die Gemeinsamkeit aller additiven bzw. generativen Fertigungsverfahren ist die schichtweise Erzeugung des Objekts. Zu den wesentlichen Vorteilen der Technologie gehört die Designfreiheit, die die Integration komplexer Geometrien erlaubt.
Aufgrund der zunehmenden Verfügbarkeit kostengünstiger Geräte für den Heimgebrauch und der wachsenden Marktpräsenz von Druckdienstleistern steht die Technologie erstmals Endkunden in einer Art und Weise zur Verfügung wie es vormals, aufgrund hoher Kosten, lediglich großen Konzernen vorbehalten war. Infolgedessen ist die additive Fertigung vermehrt in den Fokus der breiten Öffentlichkeit geraten. Jedoch haben sich Wissenschaft und Forschung bisher vor allem mit Verfahrens- und Materialfragen befasst. Insbesondere Fragestellungen zu wirtschaftlichen und gesellschaftlichen Auswirkungen haben hingegen kaum Beachtung gefunden. Aus diesem Grund untersucht die vorliegende Dissertation die vielfältigen Implikationen und Auswirkungen der Technologie.
Zunächst werden Grundlagen der Fertigungstechnologie erläutert, die für das Verständnis der Arbeit eine zentrale Rolle spielen. Neben dem elementaren Funktionsprinzip der Technologie werden relevante Begrifflichkeiten aus dem Kontext der additiven Fertigung vorgestellt und zueinander in Beziehung gesetzt.
Im weiteren Verlauf werden dann Entwicklung und Akteure der Wertschöpfungskette der additiven Fertigung skizziert. Anschließend werden diverse Geschäftsmodelle im Kontext der additiven Fertigung systematisch visualisiert und erläutert. Ein weiterer wichtiger Aspekt sind die zu erwartenden wirtschaftlichen Potentiale, die sich aus einer Reihe technischer Charakteristika ableiten lassen. Festgehalten werden kann, dass der Gestaltungsspielraum von Fertigungssystemen hinsichtlich Komplexität, Effizienzsteigerung und Variantenvielfalt erweitert wird. Die gewonnenen Erkenntnisse werden außerdem genutzt, um zwei Vertreter der Branche exemplarisch mithilfe von Fallstudien zu analysieren.
Eines der untersuchten Fallbeispiele ist die populäre Online-Plattform und -Community Thingiverse, die das Veröffentlichen, Teilen und Remixen einer Vielzahl von druckbaren digitalen 3D-Modellen ermöglicht. Das Remixen, ursprünglich bekannt aus der Musikwelt, wird im Zuge des Aufkommens offener Online-Plattformen heute beim Entwurf beliebiger physischer Dinge eingesetzt. Trotz der unverkennbaren Bedeutung sowohl für die Quantität als auch für die Qualität der Innovationen auf diesen Plattformen, ist über den Prozess des Remixens und die Faktoren, die diese beeinflussen, wenig bekannt. Aus diesem Grund werden die Remix-Aktivitäten der Plattform explorativ analysiert. Auf Grundlage der Ergebnisse der Untersuchung werden fünf Thesen sowie praxisbezogene Empfehlungen bzw. Implikationen formuliert. Im Vordergrund der Analyse stehen die Rolle von Remixen in Design-Communities, verschiedene Muster im Prozess des Remixens, Funktionalitäten der Plattform, die das Remixen fördern und das Profil der remixenden Nutzerschaft.
Aufgrund enttäuschter Erwartungen an den 3D-Druck im Heimgebrauch wurde dieser demokratischen Form der Produktion kaum Beachtung geschenkt. Richtet man den Fokus jedoch nicht auf die Technik, sondern die Hobbyisten selbst, lassen sich neue Einblicke in die zugrunde liegenden Innovationsprozesse gewinnen. Die Ergebnisse einer qualitativen Studie mit über 75 Designern zeigen unter anderem, dass Designer das Konzept des Remixens bereits verinnerlicht haben und dieses über die Plattform hinaus in verschiedenen Kontexten einsetzen. Ein weiterer Beitrag, der die bisherige Theorie zu Innovationsprozessen erweitert, ist die Identifikation und Beschreibung von sechs unterschiedlichen Remix-Prozessen, die sich anhand der Merkmale Fähigkeiten, Auslöser und Motivation unterscheiden lassen.
Background
The role of a healthy dietary pattern in the prevention of abdominal aortic aneurysms (AAA) is unknown. We aimed to evaluate the relationship between adherence to a Dietary Approaches To Stop Hypertension‐style dietary pattern and the risk of incident AAAs.
Methods and Results
Dietary intake was assessed via a 66‐item food frequency questionnaire at baseline (1987–1989) and at visit 3 (1993–1995) in 13 496 participants enrolled in the ARIC (Atherosclerosis Risk in Communities) study without clinical AAA (mean age, 54 years). A dietary scoring index based on food times was constructed to assess self‐reported adherence to a dietary approaches to stop hypertension‐style dietary pattern. Participants were followed for incident clinical AAAs using hospital discharge diagnoses, Medicare inpatient and outpatient diagnoses, or death certificates through December 31, 2011. Cox proportional hazards models with covariate adjustment were used to estimate hazard ratios with 95% confidence intervals. During a median follow‐up of 23 years, there were 517 incident AAA cases. Individuals with a Dietary Approaches To Stop Hypertension‐style diet score in the highest quintile had a 40% lower risk of hospitalization for AAA than those in the lowest quintile (hazard ratio\(_{Q5}\) vs \(_{Q1}\): 0.60; 95% confidence intervals: 0.44, 0.83; P\(_{trend}\)=0.002). In detailed analyses, higher consumption of fruits, vegetables, whole grains, low‐fat dairy, and nuts and legumes was related to a lower risk for AAA.
Conclusions
Greater adherence to a Dietary Approaches To Stop Hypertension‐style dietary pattern was associated with lower risk for AAA. Higher consumption of fruits, vegetables, whole grains, low‐fat dairy as well as nuts and legumes may help to decrease the burden of AAAs.
Der orale Tyrosinkinaseinhibitor (TKI) Imatinib wurde 2002 zur Behandlung der chronischen myeloischen Leukämie (CML) zugelassen und ist als „targeted therapy“, die sich gegen das die Erkrankung in den meisten Fällen verursachende BCR/ABL1-Fusionsprotein richtet, als Meilenstein in der Therapie der CML zu sehen. Neben verschiedenen unerwünschten Arzneimittelwirkungen (UAW) stellt auch eine niedrige Rate der Adhärenz, also der Übereinstimmung des Patientenverhaltens mit den Empfehlungen der behandelnden Ärzte, ein entscheidendes Problemfeld im klinischen Einsatz von Imatinib dar. Zusätzlich zu persönlichen Eigenschaften des Patienten und speziellen Merkmalen der Erkrankung spielt hierbei unter anderem auch die Interaktion zwischen Arzt und Patient eine herausragende Rolle.
Fälschlicherweise wird bei Patienten mit einer malignen Neoplasie prinzipiell von adhärentem Verhalten ausgegangen; mangelnde Patientenschulung oder Arzneimittelinteraktionen führen jedoch häufig zu Nonadhärenz mit zum Teil lebensbedrohlichen Folgen. So postuliert etwa die 2009 von Noens et al. veröffentlichte ADAGIO-Studie bei lediglich 14,2 % der Patienten unter TKI Therapie bei CML ein absolut adhärentes Verhalten.
Die vorliegende Arbeit beschäftigt sich in diesem Kontext schwerpunktmäßig mit steuerbaren Einflussfaktoren wie Copingstrategien und dem Wissensstand der Patienten über die Therapie ihrer Erkrankung. Hierzu wurde bei 37 in einer universitären Spezialambulanz behandelten CML-Patienten (21 Männer und 16 Frauen mit einem mittleren Alter von 59 Jahren) zunächst mittels des „Basel Assessment of Adherence Scale with Immunosuppressive Medication“ (BAASIS) die Adhärenz unter Imatinib erhoben. Dabei ergab sich eine Adhärenzrate von 49 %, die niedrig, aber tendenziell höher als erwartet ausfiel. Bei einer moderateren Definition von adhärentem Verhalten zeigt sich sogar eine Adhärenzrate von 84 %.
Eine Auswertung des „Freiburger Fragebogens zur Krankheitsverarbeitung“ im selben Patientenkollektiv verdeutlicht wie wichtig ein stabiles Arzt-Patienten-Verhältnis ist, auch wenn keine signifikante Korrelation zwischen positivem Coping und adhärentem Verhalten gezeigt werden konnte.
Bisher in diesem Rahmen wenig erforscht ist die Angst vor einem Fortschreiten der Erkrankung, die mit dem Progredienzangst-Fragebogen von Herschbach erfasst werden kann. Von dieser Angst ist die Mehrheit der Studienteilnehmer betroffen (73 % mittleres Ausmaß, 16 % hohes Ausmaß an Progredienzangst). Vermutlich bedingt durch die kleine Stichprobengröße ließ sich auch hier keine signifkante Korrelation zur Adhärenz herstellen. Mit einem p-Wert von 0,003 zeigt sich jedoch ein statistisch signifikanter Zusammenhang zwischen maladaptiven Copingstrategien („Bagatellisierung und Wunschdenken“) und verstärkter Progredienzangst. Auch bei depressiven Verarbeitungsstrukturen lässt sich die Tendenz zu einer Korrelation erkennen (p-Wert 0,06). Neben einem Progress der Erkrankung ist die Angst vor unerwünschten Nebenwirkungen für Patienten von großer Bedeutung. Insbesondere bei den – selbst in der moderateren Auslegung des BAASIS – nonadhärenten Patienten zeigt sich eine signifikante Korrelation (p-Wert 0,023). Dadurch wird der Stellenwert einer guten Aufklärung und Schulung der Patienten deutlich, vor allem da Patienten ihr konkretes Wissen bezüglich Krankheit und Therapie oft zu überschätzen scheinen.
Abschließend bleibt festzuhalten, dass eine Förderung adhärenten Verhaltens auch bei onkologischen Patienten von enormer Bedeutung ist. Besonders zu berücksichtigende Themen sind Verarbeitungsstrategien, der Umgang mit Ängsten sowie die Information und Schulung der Patienten.
The goal of this work is to improve the understanding of adsorption-induced deformation in nanoporous (and in particular microporous) materials in order to explore its potential for material characterization and provide guidelines for related technical applications such as adsorption-driven actuation. For this purpose this work combines in-situ dilatometry measurements with in-depth modeling of the obtained adsorption-induced strains. A major advantage with respect to previous studies is the combination of the dilatometric setup and a commercial sorption instrument resulting in high quality adsorption and strain isotherms. The considered model materials are (activated and thermally annealed) carbon xerogels, a sintered silica aerogel, a sintered hierarchical structured porous silica and binderless zeolites of type LTA and FAU; this selection covers micro-, meso- and macroporous as well as ordered and disordered model materials.
All sample materials were characterized by scanning electron microscopy, gas adsorption and sound velocity measurements. In-situ dilatometry measurements on mesoporous model materials were performed for the adsorption of N2 at 77 K, while microporous model materials were also investigated for CO2 adsorption at 273 K, Ar adsorption at 77 K and H2O adsorption at 298 K. Within this work the available in-situ dilatometry setup was revised to improve resolution and reproducibility of measurements of small strains at low relative pressures, which are of particular relevance for microporous materials.
The obtained experimental adsorption and strain isotherms of the hierarchical structured porous silica and a micro-macroporous carbon xerogel were quantitatively analyzed based on the adsorption stress model; this approach, originally proposed by Ravikovitch and Neimark, was extended for anisotropic pore geometries within this work. While the adsorption in silica mesopores could be well described by the classical and analytical theory of Derjaguin, Broekhoff and de Boer, the adsorption in carbon micropores required for comprehensive nonlocal density functional theory calculations. To connect adsorption-induced stresses and strains, furthermore mechanical models for the respective model materials were derived. The resulting theoretical framework of adsorption, adsorption stress and mechanical model was applied to the experimental data yielding structural and mechanical information about the model materials investigated, i.e., pore size or pore size distribution, respectively, and mechanical moduli of the porous matrix and the nonporous solid skeleton. The derived structural and mechanical properties of the model materials were found to be consistent with independent measurements and/or literature values. Noteworthy, the proposed extension of the adsorption stress model proved to be crucial for the correct description of the experimental data.
Furthermore, it could be shown that the adsorption-induced deformation of disordered mesoporous aero-/xerogel structures follows qualitatively the same mechanisms obtained for the ordered hierarchical structured porous silica. However, respective quantitative modeling proved to be challenging due to the ill-shaped pore geometry of aero-/xerogels; good agreement between model and experiment could only be achieved for the filled pore regime of the adsorption isotherm and the relative pressure range of monolayer formation. In the intermediate regime of multilayer formation a more complex model than the one proposed here is required to correctly describe stress related to the curved adsorbate-adsorptive interface. Notably, for micro-mesoporous carbon xerogels it could be shown that micro- and mesopore related strain mechanisms superimpose one another.
The strain isotherms of the zeolites were only qualitatively evaluated. The result for the FAU type zeolite is in good agreement with other experiments reported in literature and the theoretical understanding derived from the adsorption stress model. On the contrary, the strain isotherm of the LTA type zeolite is rather exceptional as it shows monotonic expansion over the whole relative pressure range. Qualitatively this type of strain isotherm can also be explained by the adsorption stress model, but a respective quantitative analysis is beyond the scope of this work.
In summary, the analysis of the model materials' adsorption-induced strains proved to be a suitable tool to obtain information on their structural and mechanical properties including the stiffness of the nonporous solid skeleton. Investigations on the carbon xerogels modified by activation and thermal annealing revealed that adsorption-induced deformation is particularly suited to analyze even small changes of carbon micropore structures.
In order to mimic the extracellular matrix for tissue engineering, recent research approaches often involve 3D printing or electrospinning of fibres to scaffolds as cell carrier material. Within this thesis, a micron fibre printing process, called melt electrospinning writing (MEW), combining both additive manufacturing and electrospinning, has been investigated and improved. Thus, a unique device was developed for accurate process control and manufacturing of high quality constructs. Thereby, different studies could be conducted in order to understand the electrohydrodynamic printing behaviour of different medically relevant thermoplastics as well as to characterise the influence of MEW on the resulting scaffold performance.
For reproducible scaffold printing, a commonly occurring processing instability was investigated and defined as pulsing, or in extreme cases as long beading. Here, processing analysis could be performed with the aim to overcome those instabilities and prevent the resulting manufacturing issues. Two different biocompatible polymers were utilised for this study: poly(ε-caprolactone) (PCL) as the only material available for MEW until then and poly(2-ethyl-2-oxazoline) for the first time. A hypothesis including the dependency of pulsing regarding involved mass flows regulated by the feeding pressure and the electrical field strength could be presented. Further, a guide via fibre diameter quantification was established to assess and accomplish high quality printing of scaffolds for subsequent research tasks.
By following a combined approach including small sized spinnerets, small flow rates and high field strengths, PCL fibres with submicron-sized fibre diameters (fØ = 817 ± 165 nm) were deposited to defined scaffolds. The resulting material characteristics could be investigated regarding molecular orientation and morphological aspects. Thereby, an alignment and isotropic crystallinity was observed that can be attributed to the distinct acceleration of the solidifying jet in the electrical field and by the collector uptake. Resulting submicron fibres formed accurate but mechanically sensitive structures requiring further preparation for a suitable use in cell biology. To overcome this handling issue, a coating procedure, by using hydrophilic and cross-linkable star-shaped molecules for preparing fibre adhesive but cell repellent collector surfaces, was used.
Printing PCL fibre patterns below the critical translation speed (CTS) revealed the opportunity to manufacture sinusoidal shaped fibres analogously to those observed using purely viscous fluids falling on a moving belt. No significant influence of the high voltage field during MEW processing could be observed on the buckling phenomenon. A study on the sinusoidal geometry revealed increasing peak-to-peak values and decreasing wavelengths as a function of decreasing collector speeds sc between CTS > sc ≥ 2/3 CTS independent of feeding pressures. Resulting scaffolds printed at 100 %, 90 %, 80 % and 70 % of CTS exhibited significantly different tensile properties, foremost regarding Young’s moduli (E = 42 ± 7 MPa to 173 ± 22 MPa at 1 – 3 % strain). As known from literature, a changed morphology and mechanical environment can impact cell performance substantially leading to a new opportunity of tailoring TE scaffolds.
Further, poly(L-lactide-co-ε-caprolactone-co-acryloyl carbonate) as well as poly(ε-caprolactone-co-acryloyl carbonate) (PCLAC) copolymers could be used for MEW printing. Those exhibit the opportunity for UV-initiated radical cross-linking in a post-processing step leading to significantly increased mechanical characteristics. Here, single fibres of the polymer composed of 90 mol.% CL and 10 mol.% AC showed a considerable maximum tensile strength of σmax = 53 ± 16 MPa. Furthermore, sinusoidal meanders made of PCLAC yielded a specific tensile stress-strain characteristic mimicking the qualitative behaviour of tendons or ligaments. Cell viability by L929 murine fibroblasts and live/dead staining with human mesenchymal stem cells revealed a promising biomaterial behaviour pointing out MEW printed PCLAC scaffolds as promising choice for medical repair of load-bearing soft tissue.
Indeed, one apparent drawback, the small throughput similar to other AM methods, may still prevent MEW’s industrial application yet. However, ongoing research focusses on enlargement of manufacturing speed with the clear perspective of relevant improvement. Thereby, the utilisation of large spinneret sizes may enable printing of high volume rates, while downsizing the resulting fibre diameter via electrical field and mechanical stretching by the collector uptake. Using this approach, limitations of FDM by small nozzle sizes could be overcome. Thinking visionary, such printing devices could be placed in hospitals for patient-specific printing-on-demand therapies one day. Taking the evolved high deposition precision combined with the unique small fibre diameter sizes into account, technical processing of high performance membranes, filters or functional surface finishes also stands to reason.
Aktivierung des MEK5/ Erk5-Signalwegs durch inhibitorische Substanzen des Mevalonatstoffwechsels
(2018)
Die Osteoporose ist eine Erkrankung, die durch verminderte Dichte und erhöhte Fragilität des Knochens gekennzeichnet ist. Sie zählt zu den häufigsten Erkrankungen weltweit und geht mit erheblicher Einschränkung der Lebensqualität und erhöhter Mortalität einher. Eine Behandlungsmöglichkeit dieses schwerwiegenden Krankheitsbilds ist die Therapie mit Bisphosphonaten. Diese hemmen mit ihren antiresorptiven Eigenschaften den Knochenabbau und fördern vermutlich gleichzeitig den Knochenaufbau. Obwohl schon lange die Wirkungsweise der Bisphosphonate erforscht wird, ist noch nicht sicher geklärt, wie beispielsweise osteoanabole oder antitumoröse Effekte vermittelt werden. Einen Erklärungsansatz bietet der MEK5/ Erk5-Signalweg. Diesem werden unter anderem antiangiogenetische, antiinflammatorische und antiproliferative Eigenschaften zugesprochen. In früheren Studien konnte gezeigt werden, dass Statine Erk5 und Erk5-abhängige Gene aktivieren können. Statine wiederum inhibieren ebenfalls den Mevalonatstoffwechsel, jedoch weiter upstream als Bisphosphonate. Da Statine zudem osteoanabole Effekte aufweisen, lag die These nahe, dass auch Bisphosphonate ihre Wirkung über den MEK5/Erk5-Signalweg vermitteln könnten. Die These konnte im Rahmen dieser Arbeit bestätigt werden: Stickstoffhaltige, nicht aber stickstofffreie Bisphosphonate aktivieren Erk5 sowohl in Endothelzellen als auch in Osteoblasten. Es gilt jedoch zu bedenken, dass eine Weiterentwicklung der Substanzen mit verbesserter Aufnahme in die Zelle zur Vermeidung von Apoptose-Induktion anzustreben ist.
Des Weiteren konnte gezeigt werden, dass ein Knock-down der FDPS, dem Angriffspunkt der Bisphosphonate im Mevalonatstoffwechsel, ebenfalls eine Erk5-Phosphorylierung zur Folge hat. Durch Inhibition der FDPS wird die Prenylierung kleiner G-Proteine wie Cdc42 unterbunden, was eine veränderte Funktion der Proteine zur Folge hat. Ein Knock-down von Cdc42 mittels siRNA führt wiederum zu einer Aktivierung von Erk5. Auf diese Weise wurde nicht nur ein neuer Wirkungsweg der Bisphosphonate identifiziert, sondern auch ein möglicher Aktivierungsmechanismus der MEK5/ Erk5-Signalkaskade aufgedeckt.
Erk5 wandert nach seiner Aktivierung in den Zellkern und beeinflusst dort die Genexpression. Im Rahmen dieser Arbeit wurden knochenrelevante Gene identifiziert, die durch Zoledronat-Stimulation induziert werden konnten. Zu diesen zählen INPP4B, das die Osteoklastogenese inhibiert, und PTHLH sowie FOSL1, welche die Osteoblastogenese fördern. Somit kann davon ausgegangen werden, dass die Aktivierung des MEK5/ Erk5-Signalwegs durch Zoledronat eine Geninduktion zur Folge hat, die sowohl die osteoanabole Wirkung unterstützt, als auch die katabolen Effekte hemmt. Auf diese Weise konnte neben den bereits bekannten Wirkungswegen der Bisphosphonate ein neuer identifiziert werden, der auch einen möglichen Ansatz für weitere, bisher ungeklärte Effekte von Bisphosphonaten darstellt.
The Concealed Information Test (CIT) is a well-validated means to detect whether someone possesses certain (e.g., crime-relevant) information. The current study investigated whether alcohol intoxication during CIT administration influences reaction time (RT) CIT-effects. Two opposing predictions can be made. First, by decreasing attention to critical information, alcohol intoxication could diminish CIT-effects. Second, by hampering the inhibition of truthful responses, alcohol intoxication could increase CIT-effects. A correlational field design was employed. Participants (n = 42) were recruited and tested at a bar, where alcohol consumption was voluntary and incidental. Participants completed a CIT, in which they were instructed to hide knowledge of their true identity. BAC was estimated via breath alcohol ratio. Results revealed that higher BAC levels were correlated with higher CIT-effects. Our results demonstrate that robust CIT effects can be obtained even when testing conditions differ from typical laboratory settings and strengthen the idea that response inhibition contributes to the RT-CIT effect.
Altersassoziierte und strahleninduzierte Veränderungen des genomweiten DNA-Methylierungs-Profils
(2018)
Der Prozess des Alterns ist ein komplexer multifaktorieller Vorgang, der durch eine sukzessive Verschlechterung der physiologischen Funktionen charakterisiert ist. Ein hohes Alter ist der Hauptrisikofaktor für die meisten Krankheiten, einschließlich Krebs und Herz-Kreislauf-Erkrankungen. Das Verständnis der epigenetischen Mechanismen, die in den Prozess des Alterns involviert sind, könnte zur Entwicklung pharmakologischer Interventionen beitragen, die nicht nur die Lebenserwartung erhöhen, sondern auch den Beginn des altersassoziierten funktionellen Abbaus verzögern könnten. Durch die Langzeit-Kultivierung primärer humaner Fibroblasten wurde ein in vitro Modell für das Altern etabliert, das die Identifizierung altersassoziierter DNA-Methylierungs-Veränderungen ermöglichte. Die in vitro Alterung konnte mit einer globalen Hypomethylierung und einer erhöhten DNA-Methylierung der ribosomalen DNA assoziiert werden. Darüber hinaus konnten DNA-Methylierungs-Veränderungen in Genen und Signalwegen, die für das Altern relevant sind, und ein erhöhtes epigenetisches Alter nachgewiesen werden.
Das in vitro Modell für das Altern wurde verwendet, um neben den direkten Effekten ionisierender Strahlung auf die DNA-Methylierung auch deren Langzeit-Effekte zu untersuchen. Die Strahlentherapie ist ein entscheidendes Element der Krebstherapie, hat aber auch negative Auswirkungen und kann unter anderem das Risiko für die Entwicklung eines Zweittumors erhöhen. Bei externer Bestrahlung wird neben dem Tumor auch gesundes Gewebe ionisierender Strahlung ausgesetzt. Daher ist es wichtig zu untersuchen, wie Zellen mit intakten DNA-Reparatur-Mechanismen und funktionierenden Zellzyklus-Checkpoints durch diese beeinflusst werden. In der frühen Phase der DNA-Schadensantwort auf Bestrahlung wurden in normalen Zellen keine wesentlichen DNA-Methylierungs-Veränderungen beobachtet. Mehrere Populations-Verdoppelungen nach Strahlenexposition konnten dagegen eine globale Hypomethylierung, eine erhöhte DNA-Methylierung der ribosomalen DNA und ein erhöhtes epigenetisches Alter detektiert werden. Des Weiteren zeigten Gene und Signalwege, die mit Krebs in Verbindung gebracht wurden, Veränderungen in der DNA-Methylierung. Als Langzeit-Effekte ionisierender Strahlung traten somit die mit der in vitro Alterung assoziierten DNA-Methylierungs-Veränderungen verstärkt auf und ein epigenetisches Muster, das stark an das DNA-Methylierungs-Profil von Tumorzellen erinnert, entstand. Man geht davon aus, dass Veränderungen der DNA-Methylierung eine aktive Rolle in der Entwicklung eines Tumors spielen. Die durch ionisierende Strahlung induzierten DNA-Methylierungs-Veränderungen in normalen Zellen könnten demnach in die Krebsentstehung nach Strahlenexposition involviert sein und zu dem sekundären Krebsrisiko nach Strahlentherapie beitragen. Es ist bekannt, dass Patienten unterschiedlich auf therapeutische Bestrahlung reagieren. Die Ergebnisse dieser Arbeit weisen darauf hin, dass die individuelle Sensitivität gegenüber ionisierender Strahlung auch auf epigenetischer Ebene beobachtet werden kann.
In einem zweiten Projekt wurden Gesamtblutproben von Patienten mit Werner-Syndrom, einer segmental progeroiden Erkrankung, und gesunden Kontrollen analysiert, um mit dem vorzeitigen Altern in Verbindung stehende DNA-Methylierungs-Veränderungen zu identifizieren. Werner-Syndrom konnte nicht mit einer globalen Hypomethylierung, jedoch mit einer erhöhten DNA-Methylierung der ribosomalen DNA und einem erhöhten epigenetischen Alter assoziiert werden. Das vorzeitige Altern geht demzufolge mit spezifischen epigenetischen Veränderungen einher, die eine Beschleunigung der mit dem normalen Altern auftretenden DNA-Methylierungs-Veränderungen darstellen.
Im Rahmen dieser Arbeit konnte die Bedeutung epigenetischer Mechanismen im Prozess des Alterns hervorgehoben werden und gezeigt werden, dass sowohl exogene Faktoren, wie ionisierende Strahlung, als auch endogene Faktoren, wie das in Werner-Syndrom-Patienten mutiert vorliegende WRN-Gen, altersassoziierte DNA-Methylierungs-Veränderungen beeinflussen können.
Altruistic punishment is connected to trait anger, not trait altruism, if compensation is available
(2018)
Altruistic punishment and altruistic compensation are important concepts that are used to investigate altruism. However, altruistic punishment has been found to be correlated with anger. We were interested whether altruistic punishment and altruistic compensation are both driven by trait altruism and trait anger or whether the influence of those two traits is more specific to one of the behavioral options. We found that if the participants were able to apply altruistic compensation and altruistic punishment together in one paradigm, trait anger only predicts altruistic punishment and trait altruism only predicts altruistic compensation. Interestingly, these relations are disguised in classical altruistic punishment and altruistic compensation paradigms where participants can either only punish or compensate. Hence altruistic punishment and altruistic compensation paradigms should be merged together if one is interested in trait altruism without the confounding influence of trait anger.
To understand basic principles about the interaction of electromagnetic radiation with matter is often a challenge in chemical education due to the difficult theoretical background of this topic. The present contribution therefore offers an experimental based introduction into the basic principles of UV/Vis spectroscopy following a three-step strategy. The starting point is to construct a simple self-built spectrometer working within the visible range of light. Learners can explore the most important components of such a device and understand their functions without previous knowledge. In a second step, emission spectra of different common light sources are investigated and compared. Finally, spectroscopic experiments are suggested for chemical education such as the qualitative detection of cations and the quantitative analysis of the dye carmine in food. This context-based introduction links chemical applications with the everyday life. It can be presumed that this way, learners are provided an easier access to radiation-matter interaction.
Der humanpathogene Schimmelpilz A. fumigatus ist ein opportunistischer Krankheitserreger, der ein hohes Risiko eines letalen Krankheitsverlaufs durch das Auslösen einer invasiven Aspergillose (IA) birgt. Bei der IA handelt es sich um eine Infektion des Lungengewebes, welche hauptsächlich immunsupprimierte Menschen befällt. A. fumigatus stellt die Ursache für diese infektiöse Komplikation dar, welche von einem intakten Immunsystem in der Regel problemlos abgewehrt wird. Eine wichtige Abwehrbarriere gegen den Pilz setzt sich aus Zellen des angeborenen Immunsystems zusammen. In der vorliegenden Arbeit waren in diesem Zusammenhang natürliche Killerzellen (NK-Zellen) und dendritische Zellen (DCs) von besonderer Relevanz. NK- Zellen schütten lösliche Faktoren aus, welche als antifungale Mediatoren agieren. DCs besitzen hingegen die Fähigkeit, Pilzmorphologien zu phagozytieren. Im Anschluss an die Interaktion mit dem Pilz sekretieren beide Zelltypen Zytokine, welche wiederum weitere Immunzellen stimulieren. Besonders den DCs wird eine wichtige Funktion in der Immunabwehr gegen A. fumigatus zugeschrieben, da ihre Fähigkeit, das angeborene mit dem adaptiven Immunsystem zu verknüpfen, von großer Bedeutung ist. Ziel dieser Arbeit war es, die Interaktionen von primären Monozyten abgeleiteten DCs (moDCs) und NK-Zellen mit dem Pilz A. fumigatus in vitro zu charakterisieren. Hierfür wurden mit der Methode des Live-imaging verschiedene Experimente durchgeführt, um den reziproken Einfluss der zwei Immunzellarten in Anwesenheit von A. fumigatus zu analysieren. Es konnte gezeigt werden, dass sowohl moDCs, als auch NK-Zellen mit dem Pilz interagieren. Neben NK-Zell-moDC-Interaktionen wurden auch Interaktionen mit den einzelnen Immunzelltypen und A. fumigatus beobachtet. Zusätzlich konnte nachgewiesen werden, dass die NK-Effektormoleküle IFN-ɣ, Granzym B und Perforin stimulierend auf moDCs wirken, was in einer erhöhten Zellaktivierung und einer in der Folge gesteigerten Kontaktanzahl zum Pilz resultierte.
Die Synthese der mRNA durch die RNA-Polymerase II ist der zentrale und kritische Prozess im Rahmen
der Transkriptionsregulation Protein-kodierender Gene. Viele Jahrzehnte der intensiven Erforschung brachten viele Details über diesen Mechanismus zu Tage, der von einer unglaublichen Komplexität und Dynamik geprägt ist. Dabei stellte sich heraus, dass der Mediatorkomplex eine zentrale Rolle bei der Regulation der Polymerase II-abhängigen Transkription spielt, im Besonderen der Initiation. In der Funktion einer Schnittstelle verknüpft er die allgemeine Transkriptionsmaschinerie mit den Gen- spezifischen Transkriptionsregulatoren. Durch die Interaktion des Schwanzmoduls mit diesen Regulatoren und der Interaktion des Kopfmoduls mit der Polymerase II verbindet er wie eine Brücke die oberhalb des Promotors liegenden Aktivatorsequenzen mit dem Kernpromotor und initiiert so die Ausbildung des Pre-Initiationskomplexes. Darüber hinaus mehren sich gerade in den letzten Jahren die Hinweise darauf, dass der Mediator auch noch an anderen Prozessen der Transkription beteiligt ist. Zu diesen gehören z.B. die Elongation, die Ausbildung von Genschlaufen oder auch der Umbau der Chromatinstruktur. In Anbetracht der Tatsachen, dass der Mediator (a) aus bis zu 25 Untereinheiten mit flexibler Zusammensetzung besteht, (b) eine flexible Struktur besitzt und (c) umfassend und dynamisch über posttranslationale Modifikationen modifiziert ist, erscheint es durchaus möglich, dass der Mediator all diese Funktionen ausfüllt und die Rolle einer allgemeinen Transkriptionsplattform einnimmt. Im Zusammenhang mit dieser Dissertationsschrift ist es gelungen, den Mediator innerhalb all dieser Funktionen „abzubilden“ und die bisher umfassendste Interaktomanalyse dieses Komplexes zu präsentieren. Durch die optimierten Bedingungen der Zelllyse und Co-Immunopräzipitation, gelang es auch transiente Interaktionspartner zu isolieren. Durch das metabolische Markieren der Wildtypkontrolle konnten außerdem unspezifische und spezifische Interaktionen eindeutig voneinander unterschieden werden. Über 400 Proteine wurden als signifikante Interaktionspartner des Mediators identifiziert. Viele dieser Proteine konnten als vollständige Komplexe zusammengefasst werden, z.B die RNA-Polymerase II, alle allgemeinen Transkriptionsfaktoren, der SAGA-Komplex, viele Komplexe des Chromatin Remodelings und stark acetylierte Histone. Viele weitere Interaktionspartner spielen zudem eine Rolle bei der co-transkriptionalen Prozessierung der mRNA, wie z.B dem Splicing, dem mRNA-decapping oder Abbau. Darüber hinaus gibt es starke Hinweise darauf, dass der Mediator auch mit der Polymerase I und III interagiert und an der ribosomalen Biogenese beteiligt ist. Weitere
Analysen zeigten, dass das Interaktom zudem hochdynamisch ist
Ionisierende Strahlung (IR) ist in der medizinischen Diagnostik und in der Tumortherapie von zentraler Bedeutung, kann aber Genominstabilität und Krebs auslösen. Strahleninduzierte Genominstabilität (RIGI) ist in den klonalen Nachkommen bestrahlter Zellen zu beobachten, die zugrundeliegenden Mechanismen sind jedoch noch unverstanden. Zur Erforschung von verzögerten Strahleneffekten wurden primäre embryonale Fibroblastenkulturen mit 2 Gray bestrahlt und für 20 Populationsverdopplungen klonal expandiert. Zellen, die keiner Strahlung ausgesetzt waren, dienten als Kontrolle für normale Alterungsprozesse. Die Klone wurden durch klassische Chromosomenbänderungstechniken analysiert und in Abhängigkeit der Stabilität ihres Genoms in Gruppen eingeteilt. Ein Klon wurde als stabil gewertet, wenn die analysierten Metaphasen keinerlei Auffälligkeiten zeigten, während instabile Klone ein Mosaik aus normalen und abnormalen Metaphasen waren. Die Zellen von zwei Spendern wurden untersucht, um interindividuelle Strahleneffekte zu beurteilen. Nach Bestrahlung hatten mehr als die Hälfte der Klone Metaphasen mit strukturellen Aberrationen und wurden dementsprechend als instabil eingestuft. Drei Klone zeigten zudem numerische Aberrationen, die ausschließlich das Y Chromosom betrafen. Fluoreszenz in situ Hybridisierungen verifizierten diese Beobachtung in weiteren Klonen und deuteten an, dass der Verlust des Y Chromosoms mit RIGI assoziiert ist.
Molekulare Karyotypisierungen mit SNP Arrays ergaben, dass IR in den Klonen Veränderungen der Kopienzahl auslöst. Ein Unterschied zwischen chromosomal stabilen und instabilen Klonen konnte jedoch nicht detektiert werden. Chromosomale Regionen, in denen sich bekanntermaßen fragile Stellen befinden, zeigten eine Anhäufung von CNVs. Ein RIGI Effekt konnte für die fragile Stelle 3B, in der sich das Gen FHIT befindet, identifiziert werden.
Exom Sequenzierungen von Klonen und der entsprechenden Massenkultur zeigten eine alterungsassoziierte Entstehung von Varianten. Der Effekt wurde durch die Einwirkung von Strahlung erhöht. Auf Ebene von einzelnen Nukleotiden konnten ebenfalls Anhäufungen von Schäden in bestimmten genomischen Bereichen detektiert werden, dieser Effekt ging ohne die typischen RIGI Endpunkte einher.
Die Ergebnisse der vorliegenden Arbeit zeigen, dass strahlenbedingte Veränderungen auf verschiedenen Ebenen (Chromosomen, Genkopienzahl und einzelnen Nukleotiden) beobachtet werden können, welche, unabhängig von RIGI, die Tumorentstehung begünstigen. Speziell Veränderungen im FRA3B Lokus und der Verlust des Y Chromosoms scheinen jedoch über die Destabilisierung des Genoms zur Krebsentstehung beizutragen.
Als Hämostase bezeichnet man die Gesamtheit der Reaktionen, die zu einer effektiven Blutgerinnung beitragen. Sie lässt sich in die primäre (thrombozytäre) Hämostase, in die sekundäre (plasmatische) Hämostase und in das Fibrinolysesystem einteilen. Thrombozyten, oder auch Plättchen genannt, spielen hierbei eine entscheidende Rolle. Sie binden an die durch eine Verletzung einer Blutgefäßwand freigelegten Faktoren, werden so aktiviert und aggregieren mit weiteren Thrombozyten, wodurch ein Thrombus entsteht, der die Verletzung verschließt. Zudem besitzen Thrombozyten Immunokompetenz und können mit anderen Immunzellen interagieren, über Rezeptoren Pathogene erkennen und sie direkt angreifen. Einer dieser Pathogene ist der opportunistische Pilz Aspergillus fumigatus. Dieser bildet im Verlauf seines Lebenszyklus 2,5 -3 µm kleine Konidien aus, die mit dem Wind verbreitet werden und bis tief in die Alveolen der menschlichen Lunge eingeatmet werden können. Während diese Konidien im gesunden Menschen durch das Immunsystem und andere Abwehrmechanismen eliminiert werden, können sie im immunsupprimierten Patienten, z. B. bei Patienten nach einer hämatopoietischen Stammzelltransplantation, auskeimen und verschiedene Krankheiten, sogenannte Aspergillosen, auslösen mit der Invasiven Aspergillose (IA) als schwerwiegendste Form. Diese ist assoziiert mit Gewebezerstörungen, Blutungen und Thrombenbildung am Ort der Infektion. Diese Komplikationen könnten auf einer überhöhten Immunantwort des Wirtes, auf dem mechanischen Eindringen des Pilzes in das Gewebe und die Blutgefäße oder auf einer Änderung der lokalen Hämostase durch sezernierte hydrolytische Enzyme (Proteasen) oder Sekundärmetabolite von A. fumigatus beruhen.
Um diese Änderung der Hämostase im Verlauf einer IA zu analysieren, wurde der Einfluss von Morphologien (Konidien, geschwollene Konidien, Keimschläuche und Hyphen), deren Überstände, sowie von proteolytisch aktivem Überstand und von verschiedenen Sekundärmetaboliten von A. fumigatus auf die sekundäre Hämostase und die Aggregation und Aktivität von humanen Thrombozyten untersucht. Bei der Analyse der sekundären Hämostase konnte für keinen dieser eingesetzten Effektoren ein Einfluss festgestellt werden. Bei der Analyse der primären Hämostase und dem Einsatz von Morphologien und ihrer Überstände konnte für Hyphen und ihren ankonzentrierten Überstand eine aggregationssteigernde Wirkung auf Thrombozyten beobachtet werden, die möglicherweise auf Bestandteile der Zellwand von A. fumigatus, wie z. B. β-Galactosaminogalactan (GAG) zurückzuführen ist. Proteolytisch aktiver Überstand führte zu einer Aktivierung der Thrombozyten, die zum Teil auf die PrtT-abhängige proteolytische Spaltung und damit die Aktivierung der Thrombinrezeptoren PAR1 und/oder PAR4 auf der Thrombozytenoberfläche, zum Teil aber auch auf GAG zurückzuführen sein kann. Von den hier verwendeten Mykotoxinen Gliotoxin, Fumagillin, Citrinin, Verruculogen und Deoxynivalenol konnte für Gliotoxin ein negativer Einfluss auf die Thrombozytenaktivität nachgewiesen werden. Dieses Toxin inhibierte die Aggregation und die Aktivität der Thrombozyten, möglicherweise durch die Bildung von Disulfid-Brückenbindungen oder auch durch die Bildung von reaktiven Sauerstoffspezies. Zudem wurde im Verlauf dieser Arbeit eine direkte Interaktion von Gliotoxin mit den ADP-Rezeptoren P2Y1 und P2Y12 sowie mit dem Integrin αIIbβ3 postuliert, die so zwar nicht bestätigt, aber auch nicht vollständig wiederlegt werden konnte.
Die hier dargestellten Ergebnisse zeigen deutlich zwei Wirkungen von A. fumigatus auf humane Thrombozyten: zum einen eine Aktivierung oder auch verstärkte Aggregation durch sezernierte Proteasen oder Zellwandbestandteile, zum anderen eine Hemmung durch Gliotoxin, was die bei einer IA beobachtete Thrombenbildung sowie die Blutungen erklären kann. Die Interaktion der aktivierten Thrombozyten mit den Zellen des Immunsystems sowie die zytotoxischen Eigenschaften von Gliotoxin könnten zudem für die beobachtete Gewebezerstörung verantwortlich sein. Dennoch ist weitere Forschung in diesem Gebiet unabdingbar, um die pathophysiologische Änderung der lokalen Hämostase durch A. fumigatus und seine Wirkung auf humane Thrombozyten besser zu verstehen und so eine schnellere Erkennung und Behandlung von Aspergillosen zu ermöglichen.
Analysis of the mechanism and the regulation of histatin 5 resistance in \(Candida\) \(albicans\)
(2018)
Antimycotics such as fluconazole are frequently used to treat C. albicans infections of the oral mucosa. Prolonged treatment of the fungal infection with fluconazole pose a risk to resistance development. C. albicans can adapt to these stressful environmental changes by regulation of gene expression or by producing genetically altered variants that arise in the population. Adapted variants frequently carry activating mutations in zinc cluster transcription factors, which cause the upregulation of their target genes, including genes encoding efflux pumps that confer drug resistance. MDR1, regulated by the zinc cluster transcription factor Mrr1, as well as CDR1 and CDR2, regulated by the zinc cluster transcription factor Tac1, are well-known examples of genes encoding efflux pumps that extrude the antimycotic fluconazole from the fungal cell and thus contribute to the survival of the fungus.
In this study, it was investigated if C. albicans can develop resistance to the antimicrobial peptide histatin 5, which serves as the first line of defence in the oral cavity of the human host. Recently, it was shown that C. albicans transports histatin 5 outside of the Candia cell via the efflux pump Flu1. As efflux pumps are often regulated by zinc cluster transcription factors, the Flu1 efflux pump could also be regulated by a zinc cluster transcription factor which could in a hyperactive form upregulate the expression of the efflux pump, resulting in increased export of histatin 5 and consequently in histatin 5 resistance.
In order to find a zinc cluster transcription factor that upregulates FLU1 expression, a comprehensive library of C. albicans strains containing artificially activated forms of zinc cluster transcription factors was screened for suitable candidates. The screening was conducted on medium containing mycophenolic acid because mycophenolic acid is also a substrate of Flu1 and a strain expressing a hyperactive zinc cluster transcription factor that upregulates FLU1 expression should exhibit an easily recognisable mycophenolic acid-resistant phenotype. Further, FACS analysis, quantitative real-time RT-PCR analysis, broth microdilution assays as well as histatin 5 assays were conducted to analyse the mechanism and the regulation of histatin 5 resistance.
Several zinc cluster transcription factors caused mycophenolic acid resistance and upregulated FLU1 expression. Of those, only hyperactive Mrr1 was able to confer increased histatin 5 resistance. Finding Mrr1 to confer histatin 5 resistance was highly interesting as fluconazole-resistant strains with naturally occurring Mrr1 gain of function mutations exist, which were isolated from HIV-infected patients with oral candidiasis. These Mrr1 gain of function mutations as well as artificially activated Mrr1 cause fluconazole resistance by upregulation of the efflux pump MDR1 and other target genes. In the course of the study, it was found that expression of different naturally occurring MRR1 gain-of-function mutations in the SC5314 wild type background caused increased FLU1 expression and increased histatin 5 resistance. The same was true for fluconazole-resistant clinical isolates with Mrr1 gain of function mutations, which also caused the overexpression of FLU1. Those cells were less efficiently killed by histatin 5 dependent on Mrr1. Surprisingly, FLU1 contributed only little to histatin 5 resistance, rather, overexpression of MDR1 mainly contributed to the Mrr1-mediated histatin 5 resistance, but also additional Mrr1-target genes were involved. These target genes are yet to be uncovered. Moreover, if a link between the yet unknown Mrr1-target genes contributing to fluconazole resistance and increased histatin 5 resistance can be drawn remains to be discovered upon finding of the responsible target genes.
Collectively, this study contributes to the understanding of the impact of prolonged antifungal exposure on the interaction between host and fungus. Drug therapy can give rise to resistance evolution resulting in strains that have not only developed resistance to fluconazole but also to an innate host mechanism, which allows adaption to the host niche even in the absence of the drug.
Röntgencomputertomographie (CT) hat in ihrer industriellen Anwendung ein sehr breites Spektrum möglicher Prüfobjekte. Ziel einer CT-Messung sind dreidimensionale Abbilder der Verteilung des Schwächungskoeffizienten der Objekte mit möglichst großer Genauigkeit. Die Parametrierung eines CT-Systems für ein optimales Messergebnis hängt stark vom zu untersuchenden Objekt ab. Eine Vorhersage der optimalen Parameter muss die physikalischen Wechselwirkungen mit Röntgenstrahlung des Objektes und des CT-Systems berücksichtigen. Die vorliegende Arbeit befasst sich damit, diese Wechselwirkungen zu modellieren und mit der Möglichkeit den Prozess zur Parametrierung anhand von Gütemaßen zu automatisieren. Ziel ist eine simulationsgetriebene, automatische Parameteroptimierungsmethode, welche die Objektabhängigkeit berücksichtigt. Hinsichtlich der Genauigkeit und der Effizienz wird die bestehende Röntgensimulationsmethodik erweitert. Es wird ein Ansatz verfolgt, der es ermöglicht, die Simulation eines CT-Systems auf reale Systeme zu kalibrieren. Darüber hinaus wird ein Modell vorgestellt, welches zur Berechnung der zweiten Ordnung der Streustrahlung im Objekt dient. Wegen des analytischen Ansatzes kann dabei auf eine Monte-Carlo Methode verzichtet werden. Es gibt in der Literatur bisher keine eindeutige Definition für die Güte eines CT-Messergebnisses. Eine solche Definition wird, basierend auf der Informationstheorie von Shannon, entwickelt. Die Verbesserungen der Simulationsmethodik sowie die Anwendung des Gütemaßes zur simulationsgetriebenen Parameteroptimierung werden in Beispielen erfolgreich angewendet beziehungsweise mittels Referenzmethoden validiert.
Onkologische Patienten sowie klinische Forscher zeigen zunehmendes Interesse an Yogainterventionen als komplementäres Therapieverfahren zur Behandlung psychischer und körperlicher Beschwerden. Kurzzeitige Effekte von Yogatherapien auf die häufig krebsassoziierten Symptome Angst, Depressivität und Fatigue wurden in zahlreichen Studien untersucht. Die Ergebnisse der Untersuchungen legen nahe, dass Tumorpatienten unmittelbar nach einer Yogaintervention eine Verbesserung der genannten Symptome erleben. Allerdings ist bisher unzureichend untersucht, ob ein Rückgang von Angst, Depressivität und Fatigue langfristig besteht.
Ziel der Studie war es daher, nachhaltige Veränderungen von Angst, Depressivität und Fatigue bei Tumorpatienten im Rahmen einer achtwöchigen Yogaintervention zu untersuchen. Wir nahmen an, dass Angst, Depressivität und Fatigue sechs Monate nach einer Yogaintervention genauso niedrig wie unmittelbar nach der Intervention sind und sich signifikant von den Ausgangswerten vor der Intervention unterscheiden. Außerdem sollte untersucht werden, wie viele Teilnehmer die Yogapraxis nach einer Yogaintervention fortführen und ob sich dies auf die Zielparameter auswirkt.
Durch eine klinische Studie im Prä-Post-Design wurden die Hypothesen geprüft. Dazu wurden Daten von 58 Teilnehmern mit unterschiedlichen Tumorerkrankungen vor, unmittelbar nach und sechs Monate nach einer achtwöchigen Gentle Hatha- Yogaintervention mittels standardisierter psychologischer Fragebögen gesammelt.
Die Mehrheit der Studienteilnehmer war weiblich (90%) und wies anamnestisch eine Mammakarzinom-Erkrankung auf (55%). Die Ergebnisse legen nahe, dass Angst und Fatigue zwischen Interventionsende und sechs Monaten später leicht zunahmen, wohingegen depressive Symptome stabil blieben. Im Vergleich zu den Ausgangswerten vor der Intervention waren Angst, Depressivität und Fatigue sechs Monate nach Interventionsende signifikant reduziert. Ein halbes Jahr nach Beendigung der Yogaintervention gaben 69% der Teilnehmer an, weiterhin Yoga zu praktizieren. Befragungen zeigten, dass die Teilnehmer subjektiv von der Yogapraxis profitierten. Die fortgeführte Yogapraxis stand jedoch nicht mit der Ausprägung von Angst, Depressivität und Fatigue zum Follow-up-Zeitpunkt in Zusammenhang.
Die Ergebnisse deuten darauf hin, dass Tumorpatienten langfristig von einer Verbesserung von Angst, Depressivität und Fatigue im Rahmen einer Yogatherapie profitieren könnten. Ein kausaler Zusammenhang zwischen Yogatherapie und der gefundenen Verbesserung sechs Monate nach Therapieende konnte jedoch durch die fehlende Kontrollbedingung nicht belegt werden. In Zukunft sollten große randomisierte kontrollierte Studien die vermutete Kausalität untersuchen.
An angular analysis of the decay B-d(0) -> K*mu(+)mu(-) is presented, based on proton-proton collision data recorded by the ATLAS experiment at the LHC. The study is using 20.3 fb(-1) of integrated luminosity collected during 2012 at centre-of-mass energy of root s = 8TeV. Measurements of the K* longitudinal polarisation fraction and a set of angular parameters obtained for this decay are presented. The results are compatible with the Standard Model predictions.
Loss of function mutations in the rsk2 gene cause Coffin-Lowry syndrome (CLS), which is associated with multiple symptoms including severe mental disabilities. Despite the characterization of ribosomal S6 kinase 2 (RSK2) as a protein kinase acting as a downstream effector of the well characterized ERK MAP-kinase signaling pathway, it turns out to be a challenging task to link RSK2 to specific neuronal processes dysregulated in case of mutation. Animal models such as mouse and Drosophila combine advanced genetic manipulation tools with in vivo imaging techniques, high-resolution connectome analysis and a variety of behavioral assays, thereby allowing for an in-depth analysis for gene functions in the nervous system. Although modeling mental disability in animal systems has limitations because of the complexity of phenotypes, the influence of genetic variation and species-specific characteristics at the neural circuit and behavioral level, some common aspects of RSK2 function in the nervous system have emerged, which will be presented. Only with this knowledge our understanding of the pathophysiology of CLS can be improved, which might open the door for development of potential intervention strategies.
To understand the gene regulation of an organism of interest, a comprehensive genome annotation is essential. While some features, such as coding sequences, can be computationally predicted with high accuracy based purely on the genomic sequence, others, such as promoter elements or noncoding RNAs, are harder to detect. RNA sequencing (RNA-seq) has proven to be an efficient method to identify these genomic features and to improve genome annotations. However, processing and integrating RNA-seq data in order to generate high-resolution annotations is challenging, time consuming, and requires numerous steps. We have constructed a powerful and modular tool called ANNOgesic that provides the required analyses and simplifies RNA-seq-based bacterial and archaeal genome annotation. It can integrate data from conventional RNA-seq and differential RNA-seq and predicts and annotates numerous features, including small noncoding RNAs, with high precision. The software is available under an open source license (ISCL) at https://pypi.org/project/ANNOgesic/.
Background:
Multiple sclerosis (MS) is a chronic autoimmune disease of the central nervous system (CNS) for which several new treatment options were recently introduced. Among them is the monoclonal anti-CD52 antibody alemtuzumab that depletes mainly B cells and T cells in the immune periphery. Considering the ongoing controversy about the involvement of B cells and in particular the formation of B cell aggregates in the brains of progressive MS patients, an in-depth understanding of the effects of anti-CD52 antibody treatment on the B cell compartment in the CNS itself is desirable.
Methods:
We used myelin basic protein (MBP)-proteolipid protein (PLP)-induced experimental autoimmune encephalomyelitis (EAE) in C57BL/6 (B6) mice as B cell-dependent model of MS. Mice were treated intraperitoneally either at the peak of EAE or at 60 days after onset with 200 μg murine anti-CD52 vs. IgG2a isotype control antibody for five consecutive days. Disease was subsequently monitored for 10 days. The antigen-specific B cell/antibody response was measured by ELISPOT and ELISA. Effects on CNS infiltration and B cell aggregation were determined by immunohistochemistry. Neurodegeneration was evaluated by Luxol Fast Blue, SMI-32, and Olig2/APC staining as well as by electron microscopy and phosphorylated heavy neurofilament serum ELISA.
Results:
Treatment with anti-CD52 antibody attenuated EAE only when administered at the peak of disease. While there was no effect on the production of MP4-specific IgG, the treatment almost completely depleted CNS infiltrates and B cell aggregates even when given as late as 60 days after onset. On the ultrastructural level, we observed significantly less axonal damage in the spinal cord and cerebellum in chronic EAE after anti-CD52 treatment.
Conclusion:
Anti-CD52 treatment abrogated B cell infiltration and disrupted existing B cell aggregates in the CNS.
Infectious complications are a significant cause of morbidity and mortality in patients with malignancies specifically when receiving anticancer treatments. Prevention of infection through vaccines is an important aspect of clinical care of cancer patients. Immunocompromising effects of the underlying disease as well as of antineoplastic therapies need to be considered when devising vaccination strategies. This guideline provides clinical recommendations on vaccine use in cancer patients including autologous stem cell transplant recipients, while allogeneic stem cell transplantation is subject of a separate guideline. The document was prepared by the Infectious Diseases Working Party (AGIHO) of the German Society for Hematology and Medical Oncology (DGHO) by reviewing currently available data and applying evidence-based medicine criteria.
Neisseria meningitidis (meningococcus) causes invasive diseases such as meningitis or septicaemia. Ex vivo infection of human whole blood is a valuable tool to study meningococcal virulence factors and the host innate immune responses. In order to consider effects of cellular mediators, the coagulation cascade must be inhibited to avoid clotting. There is considerable variation in the anticoagulants used among studies of N. meningitidis whole blood infections, featuring citrate, heparin or derivatives of hirudin, a polypeptide from leech saliva. Here, we compare the influence of these three different anticoagulants, and additionally Mg/EGTA, on host innate immune responses as well as on viability of N. meningitidis strains isolated from healthy carriers and disease cases, reflecting different sequence types and capsule phenotypes. We found that the anticoagulants significantly impact on cellular responses and, strain-dependently, also on bacterial survival. Hirudin does not inhibit complement and is therefore superior over the other anticoagulants; indeed hirudin-plasma most closely reflects the characteristics of serum during N. meningitidis infection. We further demonstrate the impact of heparin on complement activation on N. meningitidis and its consequences on meningococcal survival in immune sera, which appears to be independent of the heparin binding antigens Opc and NHBA.
Bedingt durch ihre strukturelle Diversität und biologischen Eigenschaften sind Naturstoffe seit jeher Quelle und Inspiration für Arzneimittel vor allem im therapeutischen Bereich der Onkologie und der Infektionskrankheiten. Ihr einzigartiges pharmakologisches Potenzial wird durch die selektive Interaktion mit einer Vielzahl von Zielmolekülen hervorgerufen. Aufgrund der zentralen Bedeutung von Naturstoffen in der Entdeckung und Entwicklung von neuen Arzneimitteln sind nach wie vor die Isolierung und Strukturaufklärung, die totalsynthetische Darstellung und Derivatisierung sowie die Identifizierung der Zielmoleküle und die Aufklärung des Wirkmechanismus dieser natürlichen Wirkstoffe unabdingbar.
Die kleine, aber spannende Klasse der Naphthylisochinolin-Alkaloide, die ausschließlich aus den beiden Pflanzenfamilien der Dioncophyllaceae und der Ancistrocladaceae gewonnen werden, zeichnet sich mit ihren mehr als 200 Vertretern nicht nur durch ihre strukturelle Vielfalt aus, sondern zeigt vor allem pharmakologisch interessante Wirksamkeiten. Neben ausgeprägten In-vitro-Aktivitäten gegen protozoische Erreger wie Leishmanien, Plasmodien und Trypanosomen besitzen die Vertreter dieser einzigartigen Naturstoffklasse nach neuesten Untersuchungen auch vielversprechende antitumorale Aktivitäten. Für deren Weiterentwicklung zu möglichen Arzneistoffen ist es daher unabdingbar, ihr pharmakologisches Potenzial tiefergehend zu untersuchen.
Ziel der vorliegenden Dissertation war die Entwicklung totalsynthetischer Zugänge zu biologisch interessanten Naphthylisochinolin-Alkaloiden mit Hilfe unterschiedlicher Synthesestrategien. Ebenfalls sollten durch die Darstellung strukturell vereinfachter Derivate sowie markierter Naturstoffe in Zusammenarbeit mit Kooperationspartnern mögliche Zielmoleküle identifiziert und Beiträge zum Wirkmechanismus untersucht werden.
The number of plants pollinated by ants is surprisingly low given the abundance of ants and the fact that they are common visitors of angiosperms. Generally ants are considered as nectar robbers that do not provide pollination service. We studied the pollination system of the endangered dry grassland forb Euphorbia seguieriana and found two ant species to be the most frequent visitors of its flowers. Workers of Formica cunicularia carried five times more pollen than smaller Tapinoma erraticum individuals, but significantly more viable pollen was recovered from the latter. Overall, the viability of pollen on ant cuticles was significantly lower (p < 0.001)-presumably an antibiotic effect of the metapleural gland secretion. A marking experiment suggested that ants were unlikely to facilitate outcrossing as workers repeatedly returned to the same individual plant. In open pollinated plants and when access was given exclusively to flying insects, fruit set was nearly 100%. In plants visited by ants only, roughly one third of flowers set fruit, and almost none set fruit when all insects were excluded. The germination rate of seeds from flowers pollinated by flying insects was 31 +/- 7% in contrast to 1 +/- 1% resulting from ant pollination. We conclude that inbreeding depression may be responsible for the very low germination rate in ant pollinated flowers and that ants, although the most frequent visitors, play a negligible or even deleterious role in the reproduction of E. seguieriana. Our study reiterates the need to investigate plant fitness effects beyond seed set in order to confirm ant-plant mutualisms.
Als Orbitaltomographie wird eine junge Methode innerhalb der Photoelektronenspektrokopie bezeichnet, welche es ermöglicht, Molekülorbitale mit hoher Ortsauflösung abzubilden. Hierfür werden die zu untersuchenden Moleküle durch elektromagnetische Strahlung angeregt und die mittels Photoeffekt emittierten Elektronen hinsichtlich ihres Impulses und ihrer kinetischen Energie charakterisiert. Moderne Photoemissionsexperimente erlauben die simultane Vermessung des gesamten Impulshalbraumes oberhalb der Probe. Die detektierte Intensitätsverteilung stellt dann unter bestimmten Bedingungen das Betragsquadrat eines hemisphärischen Schnittes durch den Fourierraum des spektroskopierten Orbitals dar, wobei der Radius der Hemisphäre von der Energie der anregenden Strahlung abhängt.
Bei den in dieser Arbeit untersuchten Systemen handelt es sich um adsorbierte Moleküle, die hochgeordnete Schichten auf kristallinen Edelmetalloberflächen bilden. Im Fall eindomänigen Wachstums liefern die parallel orientierten Moleküle identische Photoemissionssignale. Kommt es hingegen zur Ausbildung von Rotations- und Spiegeldomänen, stellt die gemessene Impulsverteilung eine Superposition der unterschiedlichen Einzelbeiträge dar. Somit lassen sich Rückschlüsse auf die Orientierungen der Moleküle auf den Substraten ziehen. Diese Charakterisierung molekularer Adsorptionsgeometrien wird anhand verschiedener Modellsysteme vorgestellt.
Variiert man die Energie der anregenden Strahlung und somit den Radius der hemisphärischen Schnitte durch den Impulsraum, ist es möglich den Fourierraum des untersuchten Molekülorbitals dreidimensional abzubilden. Kombiniert man die gemessenen Intensitäten mit Informationen über die Phase der Wellenfunktion im Impulsraum, die durch zusätzliche Experimente oder rechnerisch gewonnen werden können, lässt sich durch eine Fouriertransformation ein dreidimensionales Bild des Orbitals generieren, wie Schritt für Schritt gezeigt wird.
Im Zuge eines Photoemissionsprozesses kann das Molekül in einen angeregten vibronischen Zustand übergehen. Mittels Photoemissionsexperimenten mit hoher Energieauflösung lassen sich Unterschiede zwischen den Impulsverteilungen der schwingenden Moleküle und denen im vibronischen Grundzustand feststellen. Ein Vergleich der Messdaten mit Simulationen kann die Identifikation der angeregten Schwingungsmode ermöglichen, was eine neue Methode darstellt, Erkenntnisse über die Elektron-Phonon-Kopplung in molekularen Materialien zu gewinnen.
Psychiatric disorders are thought to have a complex genetic pathology consisting of interplay of common and rare variation. Traditionally, pedigrees are used to shed light on the latter only, while here we discuss the application of polygenic risk scores to also highlight patterns of common genetic risk. We analyze polygenic risk scores for psychiatric disorders in a large pedigree (n ~ 260) in which 30% of family members suffer from major depressive disorder or bipolar disorder. Studying patterns of assortative mating and anticipation, it appears increased polygenic risk is contributed by affected individuals who married into the family, resulting in an increasing genetic risk over generations. This may explain the observation of anticipation in mood disorders, whereby onset is earlier and the severity increases over the generations of a family. Joint analyses of rare and common variation may be a powerful way to understand the familial genetics of psychiatric disorders.