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Schriftenreihe
- Frontiers in Psychology (2023) 14:1219915. https://doi.org/10.3389/fpsyg.2023.1219915 (1)
- Frontiers in Public Health (2023) 11:1153088. https://doi.org/10.3389/fpubh.2023.1153088 (1)
- International Archives of the History of Ideas / Archives internationales d’histoire des idées 242 (1)
- Methods in Molecular Biology; 2643 (1)
Sonstige beteiligte Institutionen
- Helmholtz Institute for RNA-based Infection Research (HIRI) (2)
- Klinische Studienzentrale (Universitätsklinikum) (2)
- Naturalis Biodiversity Centre (2)
- Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg (2)
- Akademie der Wissenschaften und der Literatur, Mainz (1)
- Anthropology Department University of Tennessee, Knoxville (1)
- Bungando Medical Centre, Mwanza, Tanzania (1)
- CHC Würzburg (Comprehensive Hearing Center) (1)
- CIBSS Centre for Integrative Biological Signalling Studies, University of Freiburg (1)
- CUHAS Catholic university of health and allied science, Mwanza, Tanzania (1)
Die Pyridoxal-5‘-Phosphat Phosphatase (PDXP), auch bekannt als Chronophin (CIN), ist eine HAD-Phosphatase, die beim Menschen ubiquitär exprimiert wird und eine entscheidende Rolle im zellulären Vitamin-B6-Metabolismus einnimmt. PDXP ist in der Lage Pyridoxal-5‘-Phosphat (PLP), die co-enzymatisch aktive Form von Vitamin B6, zu dephosphorylieren. In-vivo Studien mit Mäusen zeigten, dass die Abwesenheit von PDXP mit verbesserten kognitiven Leistungen und einem verringerten Wachstum von Hirntumoren assoziiert ist. Dies begründet die gezielte Suche nach einem pharmakologischen Inhibitor für PDXP. Ein Hochdurchsatz-Screen legte nahe, dass 7,8-Dihydroxyflavon (7,8-DHF) hierfür ein potenzieller Kandidat ist. Zahlreiche Studien beschreiben bereits vielfältige positive neurologische Effekte nach in-vivo Administration von 7,8-DHF, allerdings bleibt der genaue Wirkmechanismus umstritten und wird bis dato nicht mit PDXP in Zusammenhang gebracht. Ziel dieser Arbeit ist es, die Inhibition von PDXP durch 7,8-DHF näher zu charakterisieren und damit einen Beitrag zur Beantwortung der Frage zu leisten, ob PDXP an den 7,8-DHF-induzierten Effekten beteiligt ist.
Hierzu wurde der Effekt von 7,8-DHF auf die enzymatische Aktivität von rekombinant hergestelltem, gereinigtem PDXP in in-vitro Phosphatase-Assays charakterisiert. Um die Selektivität von 7,8-DHF gegenüber PDXP zu untersuchen, wurden fünf weitere HAD-Phosphatasen getestet. Unter den analysierten Phosphatasen zeigte einzig die dem PDXP nah verwandte Phosphoglykolat Phosphatase (PGP) eine geringer ausgeprägte Sensitivität gegen 7,8-DHF. Ein Vergleich von 7,8-DHF mit sechs strukturell verwandten, hydroxylierten Flavonen zeigte, dass 7,8-DHF unter den getesteten Substanzen die höchste Potenz und Effektivität aufwies. Außerdem wurde eine Co-Kristallisation von PDXP mit 7,8-DHF durchgeführt, deren Struktur bis zu einer Auflösung von 2,0 Å verfeinert werden konnte. Die in der Kristallstruktur identifizierte Bindungsstelle von 7,8-DHF an PDXP wurde mittels verschiedener, neu generierter PDXP-Mutanten enzymkinetisch bestätigt. Zusammenfassend zeigen die hier beschriebenen Ergebnisse, dass 7,8-DHF ein direkter, selektiver und vorwiegend kompetitiver Inhibitor der PDXP-Aktivität ist, mit einer IC50 im submikromolaren Bereich.
Die Ergebnisse dieser in-vitro Untersuchungen motivieren zu weiterer Forschung bezüglich der 7,8-DHF-vermittelten Inhibition der PDXP-Aktivität in Zellen, um die Frage beantworten zu können, ob PDXP auch in-vivo ein relevantes Target für 7,8-DHF darstellt.
The discovery, heterologous expression, and characterization of channelrhodopsin-2 (ChR2) – a light-sensitive cation channel found in the green alga Chlamydomonas reinhardtii – led to the success of optogenetics as a powerful technology, first in neuroscience. ChR2 was employed to induce action potentials by blue light in genetically modified nerve cells. In optogenetics, exogenous photoreceptors are expressed in cells to manipulate cellular activity. These photoreceptors were in the beginning mainly microbial opsins. During nearly two decades, many microbial opsins and their mutants were explored for their application in neuroscience. Until now, however, the application of optogenetics to plant studies is limited to very few reports. Several optogenetic strategies for plant research were demonstrated, in which most attempts are based on non-opsin optogenetic tools. Opsins need retinal (vitamin A) as a cofactor to generate the functional protein, the rhodopsin. As most animals have eyes that contain animal rhodopsins, they also have the enzyme - a 15, 15'-Dioxygenase - for retinal production from food-supplied provitamin A (beta-carotene). However, higher plants lack a similar enzyme, making it difficult to express functional rhodopsins successfully in plants. But plant chloroplasts contain plenty of beta-carotene. I introduced a gene, coding for a 15, 15'-Dioxygenase with a chloroplast target peptide, to tobacco plants. This enzyme converts a molecule of β-carotene into two of all-trans-retinal. After expressing this enzyme in plants, the concentration of all-trans-retinal was increased greatly. The increased retinal concentration led to increased expression of several microbial opsins, tested in model higher plants. Unfortunately, most opsins were observed intracellularly and not in the plasma membrane. To improve their localization in the plasma membrane, some reported signal peptides were fused to the N- or C-terminal end of opsins. Finally, I helped to identify three microbial opsins -- GtACR1 (a light-gated anion channel), ChR2 (a light-gated cation channel), PPR (a light-gated proton pump) which express and work well in the plasma membrane of plants. The transgene plants were grown under red light to prevent activation of the expressed opsins. Upon illumination with blue or green light, the activation of these opsins then induced the expected change of the membrane potential, dramatically changing the phenotype of plants with activated rhodopsins.
This study is the first which shows the potential of microbial opsins for optogenetic research in higher plants, using the ubq10 promoter for ubiquitous expression. I expect this to be just the beginning, as many different opsins and tissue-specific promoters for selective expression now can be tested for their usefulness. It is further to be expected that the here established method will help investigators to exploit more optogenetic tools and explore the secrets, kept in the plant kingdom.
This dissertation explores the local gazetteers of West Lake that were compiled by literati of the Ming dynasty. In 1547, the first West Lake gazetteer was published by the local literatus of Hangzhou, Tian Rucheng 田汝成. In the late sixteenth and early seventeenth centuries, accompanying the huge enthusiasm for West Lake and the flourishing of its tourism, the production of West Lake gazetteers reached its peak. This trend, however, was reduced by the turmoils in the last years of the Ming and the dynastic transition, a period when West Lake had also experienced destruction. Nevertheless, the practice was resumed in the first decades of the Qing dynasty by some literati who had survived the disasters. One prominent work of this period was compiled by the Ming loyalist and “remnant subject” Zhang Dai 張岱, who wrote an author’s preface in 1671. This dissertation can be divided into two parts. The first part focuses on the editorial principles of compilers, e.g., which materials are included, how they are organized and presented. It explores various possible intentions of the compilers, such as scholarly and documentary, practical and oriented toward tour-guiding, didactic and educational, and personal and nostalgic ones. The second part focuses on some of the perceptions, attitudes, and values of literati focusing on West Lake. The discourses analyzed in this part include West Lake as a hybrid between metropolitan city and sheer wilderness, as a national symbol and object of nostalgia of the lost dynasty, and as a place of pleasure-seeking and indulgence. While a discourse often had a long tradition and historical development, the emphasis of the study is on the late sixteenth and early seventeenth centuries, i.e., the late Ming.
The present study discusses money and conflicts and anxiety over money in late Ming vernacular stories and contextualizes these stories in the contemporary society of economic prosperity and rapid changes. The high monetization and extensive use of silver and copper cash as currency brought both wealth and conflicts in various aspects of society. Eleven vernacular stories from several collections are adopted as source materials for the close examination, including Jingshi tongyan (Stories to Caution the World, 1624) and Xingshi hengyan (Stories to Awaken the World, 1627) by Feng Menglong (1574-1646) and the two Pai’an jingqi (Slapping the Table in Amazement, 1628 and 1632) collections by Ling Mengchu (1580-1644), etc. The analysis then focuses on the relationship between money and four topics, the late Ming context, social relations, gender ideals, and religion. Multiple voices and various viewpoints in these narratives show human beings’ struggles in taming and dominating money, the increasingly familiar and essential object in everyday life. Generally, when people cannot control money properly, there is a fear of its detrimental power to humans and social relations within and beyond families. On the contrary, characters, who are able to control money, are praised.
Ziel dieser Studie war es, zu untersuchen, ob dendritische Zellen eine Rolle beim ischämischen Schlaganfall spielen. Zur Beantwortung dieser Fragestellung wurde ein Mausmodell gewählt, in dem es nach Administration von Diphterietoxin zur selektiven Depletion CD11c positiver Zellen kommt (C.FVB-Tg(Itgax-DTR/EGFP)57Lan/J). Hierbei wird der Diphterietoxinrezeptor unter dem CD11c Promotor (ITGAX) exprimiert. Aufgrund der Wiederherstellung dendritischer Zellen nach ca. 24 Stunden waren wiederholte Applikationen von Diphterietoxin notwendig. Die Zusammensetzung anderer Immunzellen wurde dabei im Wesentlichen nicht geändert.
Für eine Schlaganfallinduktion wurde eine tMCAO (transient middle cerebral artery occlusion) durchgeführt. Hierbei wird durch Okklusion der A. cerebri media mittels Verschlussfilament für 30 oder 60 Minuten ein Schlaganfall im Mediastromgebiet induziert.
Es wurden unterschiedliche Verschlusszeiten, Zeitpunkte und Depletionsraten untersucht. In keinem der Versuchsansätze kam es zu einer signifikanten Veränderung des Schlaganfallvolumens nach Depletion CD11c positiver Zellen.
Mittels quantitativer real-time PCR wurde die Expression unterschiedlicher Zytokine nach tMCAO und CD11c-Depletion untersucht. An Tag 1 nach Schlaganfallinduktion und hoher Depletionsrate ergab sich eine Verminderung der Expression von IL-1β und IL-6, während an Tag 3 und niedriger Depletionsrate die Expression dieser Zytokine nach CD11c-Depletion zunahm. Grund hierfür könnte die Expression dieser Zytokine durch andere Zellen des Immunsystems, wie etwa neutrophile Granulozyten oder Mikroglia/Makrophagen sein, die möglicherweise einer regulatorischen Funktion durch die Interaktion von Dendritischen Zellen und regulatorischen T-Zellen unterliegen. Weitere experimentelle Ansätze sind notwendig, um diese Fragestellung beantworten zu können.
TGF-β zeigte durchgehend in allen Versuchsanordnungen eine verminderte Expression nach der Depletion dendritischer Zellen. Es ist naheliegend, dass dieses neuroprotektiv-regulatorische Zytokin direkt einer Produktion durch dendritische Zellen oder von nachfolgend aktivierten T-Zellen unterliegt.
In immunhistochemischen Studien konnte des Weiteren keine Änderung des Immigrationsverhaltens von CD11b+ Zellen ins Gehirn gesehen werden.
Diese Studie unterliegt jedoch einigen Limitationen. So stellte sich im Laufe der Experimente heraus, dass die wiederholte Applikation von Diphterietoxin zu einer erhöhten Mortalität der Versuchstiere führte. Nach Fertigstellung der Experimente erschien hierzu eine Publikation, welche die wiederholte Administration von DTX und die Entwicklung einer Myokarditis im gewählten Mausmodell in Zusammenhang brachte.
Auditorische Hirnstammimplantate (ABI stellen die einzige Option der Hörrehabilitation bei bilateraler retrocochleärer Ertaubung dar. Die Implantate sind insbesondere in ihrer größten Nutzergruppe - Neurofibromatose Typ 2 Patienten - für ihr sehr variables Hörergebnis bekannt.
Die Evozierbarkeit und die Qualität der intraoperativ abgeleiteten elektrisch evozierten auditorischen Hirnstammantworten wird als möglicher Einflussfaktor auf das Outcome diskutiert. Bisher gelten weder für die Frage des Einsatzes an sich, noch für die Methodik oder die Analyse und Bewertung der EABR in der ABI-Chirurgie einheitliche Konzepte. Ziel dieser Studie ist die detaillierte Analyse der intraoperativ registrierten EABR während ABI-Implantation bei NF2-Patienten.
Zudem stellt Beurteilung der Hörfunktion mit ABI bei NF2-Patienten stellt aufgrund oftmals begleitender Symptomatik der Grunderkrankung eine besondere Herausforderung dar. Sprachtests allein spiegeln die Hörfunktion in dieser Patientengruppe nicht immer umfassend wider. Die in dieser Studie angewendete Würzburger Skala für Implantat-Hören soll dieser Problematik gerecht werden, indem Ergebnisse eines etablierten Sprachtests mit der klinischen Kommunikationsfähigkeit kombiniert werden.
Zusammenfassung der Hauptergebnisse:
Nach intraoperativer Stimulation mittels ABI zeigten sich EABR-Antworten mit null bis 3 Vertex-positiven Peaks (P1, P2, P3), welche in dieser Kohorte im Mittel nach 0,42 ms (P1), 1,43 ms (P2) bzw. 2,40 ms (P3) auftraten. Eine 2-Peak Wellenform war in dieser Studie die am häufigsten beobachtete Morphologie (78,8%). Bei der Stimulation unterschiedlicher Elektrodenkontakte zeigten sich Unterschiede in der EABR-Wellenmorphologie. Alle Antworten konnten in eine der fünf Kategorien der Würzburger EABR-Klassifikation eingeordnet werden.
Für die Latenz von P2 konnte eine statistisch signifikante Korrelation mit der Tumorausdehnung nach Hannover Klassifikation gezeigt werden.
Die Einstufung des Hörergebnisses mit ABI in NF2 nach Ergebnis im MTP-Test und nach Kommunikationsfähigkeit im Alltag unterschied sich in 7 von 22 Fällen (31,2%) um eine Kategorie. Bei der Einordnung in die Würzburger Skala für Implantat-Hören zeigte sich nach Diskussion der divergenten Fälle in 2 Fällen die Kategorisierung zugunsten des Ergebnisses im MTP-Test und in 5 Fällen zugunsten des Ergebnisses der Kommunikationsfähigkeit im Alltag.
Nützliches Hören mit ABI konnte in 95,5% der Patienten gezeigt werden, davon erzielten 68,2% Sprachverständnis.
Die Auslösbarkeit reproduzierbarer intraoperativer EABRs konnte in 95,5% Hörvermögen hervorsagen.
Current crises have highlighted the importance of integrating research, politics and practice to work on solutions for complex social problems. In recent years, policy deliberation fora, policy pilots and policy labs have increasingly been deployed to mobilise science to produce solutions, help create popular support and guide implementation of policies addressing major public policy problems. Yet, we know little about how these approaches manage to transcend the boundaries between research, politics and practice. By systematically comparing policy deliberation fora, policy pilots and policy labs, this paper explores their mechanisms of boundary spanning including relationship and trust building, knowledge translation and developing solutions. We situate our analysis in healthcare policy and climate change policy in Germany, two contrasting policy fields that share a perpetual and escalating sense of crisis. Our findings suggest that deliberation fora, policy pilots and policy labs address different dilemmas of policymaking, namely the idea dilemma, the implementation dilemma and the legitimacy dilemma. All three approaches reduce wicked problems to a manageable scale, by grounding them in local decision-making, reducing their scope or reducing the problem analytically. We argue that despite their ambition to modernise democratic practices, unless they are institutionally well embedded, their effects are likely to be small scale, local and temporary.
N-heterocyclic carbenes (NHC) are utilized for the stabilization of reactive compounds, for the activation of strong bonds, and as ligands in transition metal chemistry. In contrast to neutral NHCs, few examples of anionic or even dianionic NHCs are known. One approach for the synthesis of anionic carbenes is the deprotonation of neutral or anionic precursors, bearing Lewis acids instead of alkyl or aryl substituents. Following this strategy, novel anionic and dianionic NHCs, featuring weakly coordinating fluorinated borane and phosphorane substituents or coordinating tricyanoborane substituents were synthesized within the scope of this thesis. These carbenes possess unprecedented stabilities compared to related species. Furthermore, their electronic and steric properties can be directly adjusted by the type of Lewis acid attached. Their potential as ligands with highly shielding weakly coordinating substituents next to the carbene coordination center was demonstrated by the syntheses of the respective NHC selenium adducts and NHC gold(I) complexes. In contrast anionic NHCs with coordinating tricyanoborane moieties have an outstanding potential as ditopic ligands with coordination being possible at the carbene center and via the cyano groups. Their beneficial ligand properties were demonstrated by the syntheses of the respective NHC selenium adducts and NHC nickeltricarbonyl complexes. The combination of electronic properties, the large buried volume, the negative charge, the possibility to act as ditopic or ligands with weakly coordinating groups, and the ease of accessibility render borane- and phosphorane functionalized NHCs unique novel ligands. A further project of this PhD thesis deals with the steric properties of Lewis acids. Therefore, an easy-to-apply model was designed to quantify the steric demand of Lewis acids. Using the results of this evaluation, a second model was developed which judges the steric repulsion in Lewis acid/base adduct formation for arbitrary sets of acids and bases.
Following the implementation of 2018’s laws on the rights of persons with disabilities (PWDs) in Egypt, students with disabilities (SWDs) have both legal and moral rights to meaningful learning opportunities and inclusive education. Despite that, SWDs still have very limited education resources which limit their career aspirations and quality of life. In this respect, education whether as part of formal education or lifelong learning is central to the museum’s mission. Museums, as part of non-formal education, are being acknowledged for their educative powers and investments in the development of quality formal, non-formal, and informal learning experiences. Further, phrases such as “inclusivity,” “accessibility,” and “diversity” were notably included in the newly approved museum definition by ICOM (2022) emphasizing museums’ obligations to embrace societal issues and shape a cultural attitude concerning disability rights, diversity, and equality together with overcoming exclusionary educational practices. The study seeks to investigate the existing resources and inclusive practices in Egyptian museums to achieve non-formal education for SWDs. Qualitative research approaches have been employed to answer a specific question: How can Egyptian museums work within their governing systems to support the learning of SWDs beyond their formal education system? The study aims to assess the potential of Egyptian museums in facilitating learning for SWDs. Further, it examines the capability of Egyptian museums in contributing to informal and non-formal learning for SWDs and striving for inclusive education inspired by the social model of disability that fosters inclusive educational programs and adopts a human rights-based approach. The results revealed that Egyptian museums contributed to the learning of SWDs, yet small-scale programs and individual efforts, but they are already engaged in active inclusive practices that address the learning of SWDs. The study suggests that they need to be acknowledged and supported by the government as state instruments and direct actors in advancing inclusive education and implementing appropriate pedagogies in favor of SWDs.
Purpose
Growing evidence implies that transition to parenthood triggers symptoms of mental burden not only in women but likewise in men, especially in high-risk pregnancies. This is the first study that examined and compared the prevalence rates of depression, anxiety, and somatic symptom burden of expectant fathers who face different risk situations during pregnancy.
Methods
Prevalence rates of paternal depression (Edinburgh postnatal depression scale), anxiety (generalized anxiety disorder seven), and somatic symptom burden (somatic symptom scale eight) were examined in two risk samples and one control group in the third trimester of their partners’ pregnancy: risk sample I (n = 41) consist of expectant fathers whose partners were prenatally hospitalized due to medical complications; risk sample II (n = 52) are fathers whose partners were prenatally mentally distressed; and control group (n = 70) are those non-risk pregnancies.
Results
On a purely descriptive level, the data display a trend of higher symptom burden of depression, anxiety, and somatic symptoms in the two risk samples, indicating that expectant fathers, whose pregnant partners were hospitalized or suffered prenatal depression, were more prenatally distressed. Exploratory testing of group differences revealed an almost three times higher prevalence rate of anxiety in fathers whose partner was hospitalized (12.2%) compared to those non-risks (4.3%).
Conclusion
Results underline the need for screening implementations for paternal prenatal psychological distress, as well as specific prevention and treatment programs, especially for fathers in risk situations, such as their pregnant partners’ prenatal hospitalization.
The study was registered with the German clinical trials register (DRKS00020131) on 2019/12/09.
Aging is known to be a risk factor for structural abnormalities and functional decline in the nervous system. Characterizing age-related changes is important to identify putative pathways to overcome deleterious effects and improve life quality for the elderly. In this study, the peripheral nervous system of 24-month-old aged C57BL/6 mice has been investigated and compared to 12-month-old adult mice. Aged mice showed pathological alterations in their peripheral nerves similar to nerve biopsies from elderly human individuals, with nerve fibers showing demyelination and axonal damage. Such changes were lacking in nerves of adult 12-month-old mice and adult, non-aged humans. Moreover, neuromuscular junctions of 24-month-old mice showed increased denervation compared to adult mice. These alterations were accompanied by elevated numbers of macrophages in the peripheral nerves of aged mice. The neuroinflammatory conditions were associated with impaired myelin integrity and with a decline of nerve conduction properties and muscle strength in aged mice.
To determine the pathological impact of macrophages in the aging mice, macrophage depletion was performed in mice by oral administration of CSF-1R specific kinase (c-FMS) inhibitor PLX5622 (300 mg/kg body weight), which reduced the number of macrophages in the peripheral nerves by 70%. The treated mice showed attenuated demyelination, less muscle denervation and preserved muscle strength. This indicates that macrophage-driven inflammation in the peripheral nerves is partially responsible for the age-related neuropathy in mice.
Based on previous observations that systemic inflammation can accelerate disease progression in mouse models of neurodegenerative diseases, it was hypothesized that systemic inflammation can exacerbate the peripheral neuropathy found in aged mice. To investigate this hypothesis, aged C57BL/6 mice were intraperitoneally injected with a single dose of lipopolysaccharide (LPS; 500 μg/kg body weight) to induce systemic inflammation by mimicking bacterial infection, mostly via activation of Toll-like receptors (TLRs). Altered endoneurial macrophage activation, highlighted by Trem2 downregulation, was found in LPS injected aged mice one month after injection. This was accompanied by a so far rarely observed form of axonal perturbation, i.e., the occurrence of “dark axons” characterized by a damaged cytoskeleton and an increased overall electron density of the axoplasm. At the same time, however, LPS injection reduced demyelination and muscle denervation in aged mice. Interestingly, TREM2 deficiency in aged mice led to similar changes to LPS injection. This suggests that LPS injection likely mitigates aging-related demyelination and muscle denervation via Trem2 downregulation.
Taken together, this study reveals the role of macrophage-driven inflammation as a pathogenic mediator in age-related peripheral neuropathy, and that targeting macrophages might be an option to mitigate peripheral neuropathies in aging individuals. Furthermore, this study shows that systemic inflammation may be an ambivalent modifier of age-related nerve damage, leading to a distinct type of axonal perturbation, but in addition to functionally counteracting, dampened demyelination and muscle denervation. Translationally, it is plausible to assume that tipping the balance of macrophage polarization to one direction or the other may determine the functional outcome in the aging peripheral nervous system of the elderly.
The light-gated cation channel Channelrhodopsin-2 was discovered and characterized in 2003. Already in 2005/2006 five independent groups demonstrated that heterologous expression of Channelrhodopsin-2 is a highly useful and simply applicable method for depolarizing and thereby activating nerve cells. The application of Channelrhodopsin-2 revolutionized neuroscience research and the method was then called optogenetics. In recent years more and more light-sensitive proteins were successfully introduced as “optogenetic tools”, not only in neuroscience. Optogenetic tools for neuronal excitation are well developed with many different cation-conducting wildtype and mutated channelrhodopsins, whereas for inhibition of neurons in the beginning (2007) only hyperpolarizing ion pumps were available. The later discovered light-activated anion channels (anion channelrhodopsins) can be useful hyperpolarizers, but only at low cytoplasmic anion concentration. For this thesis, I optimized CsR, a proton-pumping rhodopsin from Coccomyxa subellipsoidea, which naturally shows a robust expression in Xenopus laevis oocytes and plant leaves. I improved the expression and therefore the photocurrent of CsR about two-fold by N-terminal modification to the improved version CsR2.0, without altering the proton pump function and the action spectrum. A light pulse hyperpolarised the mesophyll cells of CsR2.0-expressing transgenic tobacco plants (N. tabacum) by up to 20 mV from the resting membrane potential of -150 to -200 mV. The robust heterologous expression makes CsR2.0 a promising optogenetic tool for hyperpolarization in other organisms as well. A single R83H point-mutation converted CsR2.0 into a light-activated (passive) proton channel with a reversal potential close to the Nernst potential for intra-/extra-cellular H+ concentration. This light-gated proton channel is expected to become a further useful optogenetic tool, e.g. for analysis of pH-regulation in cells or the intercellular space. Ion pumps as optogenetic tools require high expression levels and high light intensity for efficient pump currents, whereas long-term illumination may cause unwanted heating effects. Although anion channelrhodopsins are effective hyperpolarizing tools in some cases, their effect on neuronal activity is dependent on the cytoplasmic chloride concentration which can vary among neurons. In nerve cells, increased conductance for potassium terminates the action potential and K+ conductance underlies the resting membrane potential in excitable cells. Therefore, several groups attempted to synthesize artificial light-gated potassium channels but 2 all of these published innovations showed serious drawbacks, ranging from poor expression over lacking reversibility to poor temporal precision. A highly potassium selective light-sensitive silencer of action potentials is needed. To achieve this, I engineered a light-activated potassium channel by the genetic fusion of a photoactivated adenylyl cyclase, bPAC, and a cAMP-gated potassium channel, SthK. Illumination activates bPAC to produce cAMP and the elevated cAMP level opens SthK. The slow diffusion and degradation of cAMP makes this construct a very light-sensitive, long-lasting inhibitor. I have successfully developed four variants with EC50 to cAMP ranging from 7 over 10, 21, to 29 μM. Together with the original fusion construct (EC50 to cAMP is 3 μm), there are five different light- (or cAMP-) sensitive potassium channels for researchersto choose, depending on their cell type and light intensity needs.
Neurodegeneration plays an essential role in Parkinson’s disease (PD). Several crucial neuronal pro-and antidegeneration markers were described to be altered in disease models accompanied by neurodegeneration. In the AAV1/2-A53T-aSyn PD rat model progressive time-dependent motor impairment and neurodegeneration in the nigrostriatal tract starting from 2 weeks after PD model induction could be found. Downregulation of Nrf2 in SN and nigrostriatal axon localization, a trend of Tau downregulation in SN and upregulation in axon localization in the AAV1/2-A53T-aSyn PD rat model were observed, indicating potential therapeutic value of these two molecular targets in PD. No alterations of SARM1 and NMNAT2 could be detected, indicating little relevance of these two molecules with our AAV1/2-A53T-aSyn rat model.
RNA is one of the most abundant macromolecules and plays essential roles in numerous biological processes. This doctoral thesis consists of two projects focusing on RNA structure and RNA-RNA interactions in viral genome packaging. In the first project I developed a method called Functional Analysis of RNA Structure (FARS-seq) to investigate structural features regulating genome dimerization within the HIV-1 5’UTR. Genome dimerization is a conserved feature of retroviral replication and is thought to be a prerequisite for binding to the viral structural protein Pr55Gag during genome packaging. It also plays a role in genome integrity and evolution through recombination, and is linked to a structural switch that may regulate genome packaging and translation within cells. Despite its importance for HIV-1 replication, the RNA signals regulating genome dimerization, and the molecular mechanism leading to the selection of the genome dimer over the monomer for packaging are incompletely understood. The FARS-seq method combines RNA structural information obtained by chemical probing with single nucleotide resolution profiles of RNA function obtained by mutational interference. In this way, we found nucleotides that were critical for dimerization, especially within the well-characterized dimerization motif within stem-loop 1 (SL1). We also found stretches of nucleotides that enhanced genome dimerization upon mutation, suggesting their role in negatively regulating dimerization. A structural analysis identified distinct structural signatures within monomeric and dimeric RNA. The dimeric conformation displayed the canonical transactivation response (TAR), PolyA, primer binding site (PBS), and SL1-SL3 stem-loops, and contained a long range U5-AUG interaction. Unexpectedly, in monomeric RNA, SL1 was reconfigured into long- and short-range base-pairings with PolyA and PBS, respectively. Intriguingly, these base pairings concealed the palindromic sequence needed for dimerization and disrupted the internal loop in SL1 previously shown to contain the major packaging motif for Pr55Gag. We therefore rationally introduced mutations into PolyA and PBS, and showed how these regions regulate genome dimerization, and the binding of Pr55Gag in vitro, as well as genome packaging into virions. These findings give insights into late stages of the HIV-1 life cycle and a mechanistic explanation for the link between RNA dimerization and packaging.
In the second project, I developed a proximity ligation and high-throughput sequencing-based method, RNA-RNA seq, which can measure direct (RNA-RNA) and indirect (protein-mediated) interactions. In contrast to existing methods, RNA-RNA seq is not limited by specific protein or RNA baits, nor to a particular crosslinking reagent. The genome of influenza A virus contains eight segments, which assemble into a “7+1” supramolecular complex. However, the molecular details of genome assembly are poorly understood. Our goal is to use RNA-RNA seq to identify the sites of interaction between the eight genomic RNAs of influenza, and to use this information to define the quaternary RNA architecture of the genome. We showed that RNA-RNA seq worked on model substrates, like the HIV-1 Dimerization Initiation Site (DIS) RNA and purified ribosome, as well as influenza A virus infected cells.
The universal two-child policy was introduced by the central government of China in 2016 to respond to the country’s deteriorating population problems, but it was soon replaced by a three-child policy in 2021 given that it failed to continuously boost fertility in Chinese society. This dissertation empirically investigates the implementation of universal two-child policy in three Chinese major cities. Based on the data collected through semi-structured interviews with leaders of local family planning agencies, it finds that local officials are primarily devoted to coping with the discontent of the bereaved single-child parents (shidu families), which is an unexpected consequence of the historical one-child policy, rather than working on the tasks regarding birth encouragement. The dissertation suggests understanding the implementation of China’s population policy within the framework of both historical and rational choice institutionalism. The target responsibility system as an effective tool of the central authority drives local agents to fix their attention at tasks that have larger impact on their career. The shifted focus in the implementation of the universal two-child policy is a result of local officials’ emphasis on the task of maintaining social stability. Shidu families are deemed as a salient threat to social order because their discontent with the state support has incurred continuous petitions at both the national and local level, which would severely undermine local officials’ career advancement. However, in the meantime, stability maintenance is found to have become alienated as reflected by the rising costs and that it replaced birth support to be the focus of local family planning agents in the universal two-child policy era. Since the conflict between the shidu group and the state is unlikely to be resolved, the future population policy design and enforcement will continue to be constrained by the shidu problem.
Motivated by the perceived great potential of chiral polymers, the presented work aimed at the investigation of synthesis, solubility and optical activity of chiral poly(2,4-disubstituted-2-oxazoline)s. A novel polymeric carrier based on ABA-type triblock copolymers poly(2-oxazoline)s with chiral and racemic hydrophobic blocks was developed for the formulation of chiral and achiral drugs (Fig. 5.1). Poly(2-methyl-2-oxazoline) (pMeOx) was used as hydrophilic A block, and poly(2-ethyl-4-ethyl-2-oxazoline) (pEtEtOx) and poly(2-propyl-4-methyl-2-oxazoline) (pPrMeOx) were used as hydrophobic B blocks. Curcumin (CUR), paclitaxel (PTX) and chiral/racemic ibuprofen (R/S/RS-IBU) were applied as model drugs. Nanoformulations were prepared consisting of these triblock copolymers and model drugs. ...
Despite promising clinical results in osteochondral defect repair, a recently developed bi-layered collagen/collagen-magnesium-hydroxyapatite scaffold has demonstrated less optimal subchondral bone repair. This study aimed to improve the bone repair potential of this scaffold by adsorbing bone morphogenetic protein 2 (BMP-2) and/or platelet-derived growth factor-BB (PDGF-BB) onto said scaffold. The in vitro release kinetics of BMP-2/PDGF-BB demonstrated that PDGF-BB was burst released from the collagen-only layer, whereas BMP-2 was largely retained in both layers. Cell ingrowth was enhanced by BMP-2/PDFG-BB in a bovine osteochondral defect ex vivo model. In an in vivo semi-orthotopic athymic mouse model, adding BMP-2 or PDGF-BB increased tissue repair after four weeks. After eight weeks, most defects were filled with bone tissue. To further investigate the promising effect of BMP-2, a caprine bilateral stifle osteochondral defect model was used where defects were created in weight-bearing femoral condyle and non-weight-bearing trochlear groove locations. After six months, the adsorption of BMP-2 resulted in significantly less bone repair compared with scaffold-only in the femoral condyle defects and a trend to more bone repair in the trochlear groove. Overall, the adsorption of BMP-2 onto a Col/Col-Mg-HAp scaffold reduced bone formation in weight-bearing osteochondral defects, but not in non-weight-bearing osteochondral defects.
SUMOylation, as a post-translational modification, plays a crucial role in several biological processes. Small ubiquitin-like modifier (SUMO) proteins can be reversibly linked to the lysine residues located within specific motifs on numerous target proteins, leading to the change of stability, localization, activity of target proteins, mostly by promoting or interfering with the interaction with other molecules. Consequently, it can regulate gene transcription, migration, cell cycle progression, cellular responses to stress, and tumorigenesis.
NFATc1 belongs to the Nuclear Factor of Activated T-cells (NFAT) transcription factor family, which is dephosphorylated and translocates to the nucleus upon cell stimulation, which provokes Ca2+ signalling. NFAT plays a crucial role in the development and function of the immune system. NFATc1 has three SUMOylation sites at the position of aa 349, 702, and 914. In our previous study, we demonstrated that point mutations performed on the SUMOylation sites on all three or only at the lysine residues K702 and K914 lead to enhanced expression of IL-2 in vitro. To evaluate the function of SUMOylation of NFATc1 on T cell-mediated immunity in vivo, we not only generated a transgenic mouse strain (NFATc1/ΔS+ mouse) by point mutations from Lysine to Arginine on the two SUMOylation sites within exon 10 of Nfatc1 to prevent their SUMOylation, but in combination created another mouse strain (NFATc1/ΔBC+ mouse) that is completely Nfatc1 exon 10-ablated by using the LoxP/Cre system. In NFATc1/ΔS+ T cells, we observed enhanced IL-2 production and less IL-17A and IFN-γ expression. In line with exon 10 bearing the relevant SUMO sites, NFATc1/ΔBC+ CD4+ T cells behaved similarly as NFATc1/ΔS+ ones. The mechanism is that elevated IL-2 secretion can counteract the expression of IL-17A and IFN-γ via STAT5 and Blimp-1 induction. Afterwards, Blimp-1 suppressed IL-2 itself as well as Bcl2A1. Next, we performed two disease models with our NFATc1/ΔS+ mice. In a major mismatch model for acute graft-versus-host disease, we found that the mice transplanted with NFATc1/ΔS+ CD3+ T cells developed less severe disease, and T cells proliferated less due to increased Tregs. Moreover, when transferring 2D2.NFATc1/ΔS+ Th1 plus Th17 cells to Rag1-/- mice to induce experimental autoimmune encephalitis, we also observed ameliorated disease compared to animals with transferred WT T cells as well as increased Tregs.
Taking all data together, the deficiency in SUMOylation of NFATc1 leads to an elevated IL-2 secretion in T cells and subsequent activation of STAT5, which competes with STAT3 to inhibit IL-17A production and promotes Treg expansion, as well as to an enforcement of Blimp-1 expression, which suppresses IFN-γ and IL-2 expression. Consequently and despite a short phase of enhanced IL-2 secretion, the deficiency of SUMOylation on NFATc1 can protect from autoreactive and alloreactive diseases.
Moreover, to further understand the function of SUMOylation of NFATc1 in humans, we started by establishing an in vitro 3D culture system for tonsil organoids, which was successful in the presence of feeder cells, along with IL-4 and IL-7 cytokines. To confirm that our 3D tonsil organoids can respond to real antigens, we used CMV peptides and peptides of spike proteins from Covid-19 as real antigens, and co-cultured with tonsil organoids, which indeed can generate memory cells and plasmablasts. In the end, we also compared 3D to 2D cultures. Although the total numbers of all B cell subsets were much less in 3D culture than that in 2D culture, still, it indicates that this in-vitro culture system has its limitation, while being usable to produce the similar results as 2D did. Therefore, this 3D culture system can be used as a platform to investigate NFATc1/ΔS+ or NFATc1/ΔBC+ TFH and TFR cells in the dynamic of human GC responses.
In recent years, various forms of caloric restriction (CR) and amino acid or protein restriction (AAR or PR) have shown not only success in preventing age-associated diseases, such as type II diabetes and cardiovascular diseases, but also potential for cancer therapy. These strategies not only reprogram metabolism to low-energy metabolism (LEM), which is disadvantageous for neoplastic cells, but also significantly inhibit proliferation. Head and neck squamous cell carcinoma (HNSCC) is one of the most common tumour types, with over 600,000 new cases diagnosed annually worldwide. With a 5-year survival rate of approximately 55%, the poor prognosis has not improved despite extensive research and new adjuvant therapies. Therefore, for the first time, we analysed the potential of methionine restriction (MetR) in selected HNSCC cell lines. We investigated the influence of MetR on cell proliferation and vitality, the compensation for MetR by homocysteine, the gene regulation of different amino acid transporters, and the influence of cisplatin on cell proliferation in different HNSCC cell lines.
T cell exhaustion is a hallmark of cancer and persistent infections, marked by inhibitory receptor upregulation, diminished cytokine secretion, and impaired cytolytic activity. Terminally exhausted T cells are steadily replenished by a precursor population (Tpex), but the metabolic principles governing Tpex maintenance and the regulatory circuits that control their exhaustion remain incompletely understood. Using a combination of gene-deficient mice, single-cell transcriptomics, and metabolomic analyses, we show that mitochondrial insufficiency is a cell-intrinsic trigger that initiates the functional exhaustion of T cells. At the molecular level, we find that mitochondrial dysfunction causes redox stress, which inhibits the proteasomal degradation of hypoxia-inducible factor 1α (HIF-1α) and promotes the transcriptional and metabolic reprogramming of Tpex cells into terminally exhausted T cells. Our findings also bear clinical significance, as metabolic engineering of chimeric antigen receptor (CAR) T cells is a promising strategy to enhance the stemness and functionality of Tpex cells for cancer immunotherapy.
Spinal muscular atrophy (SMA) is a disabling disease that affects not only the patient’s health-related quality of life (HRQoL), but also causes a high caregiver burden (CGB). The aim of this study was to evaluate HRQoL, CGB, and their predictors in SMA. In two prospective, cross-sectional, and multi-center studies, SMA patients (n = 39) and SMA patient/caregiver couples (n = 49) filled in the EuroQoL Five Dimension Five Level Scale (EQ-5D-5L) and the Short Form Health Survey 36 (SF-36). Caregivers (CGs) additionally answered the Zarit Burden Interview (ZBI) and the Hospital Anxiety and Depression Scale (HADS). Patients were clustered into two groups with either low or high HRQoL (EQ-5D-5L index value <0.259 or >0.679). The latter group was mostly composed of ambulatory type III patients with higher motor/functional scores. More severely affected patients reported low physical functioning but good mental health and vitality. The CGB (mean ZBI = 22/88) correlated negatively with patients’ motor/functional scores and age. Higher CGB was associated with a lower HRQoL, higher depression and anxiety, and more health impairments of the CGs. We conclude that patient and CG well-being levels interact closely, which highlights the need to consider the health of both parties while evaluating novel treatments.
Die Technik der strukturierten Beleuchtungsmikroskopie (structured illumination microscopy, SIM) ist eine etablierte ultrastrukturelle Aufnahmemethode, die der hochauflösenden Visualisierung intrazellulärer Strukturen dient. In der Ophthalmologie findet diese Art der Bildgebung bisher wenig Anwendung.
SIM ermöglicht die histologische Darstellung retinaler Strukturen, wie der Zellen des humanen retinalen Pigmentepithels (RPE). In den Zellen des RPE reichern sich Granula an, die für die Autofluoreszenz-Bildgebung von Bedeutung sind. Anhand der Morphologie und autofluoreszierenden Merkmale lassen sich grundsätzlich drei Granulatypen im RPE unterscheiden: Melanosomen (M), Melanolipofuszin (ML)- und Lipofuszin (L)-Granula. Die Anwendung der SIM ermöglicht die präzise Darstellung und Differenzierung dieser autofluoreszierenden Strukturen, sowie die Bestimmung ihrer Anzahl und Lokalisation.
Ziel der Arbeit ist die Darstellung der im humanen RPE lokalisierten Granula mithilfe der SIM. Anhand der unterschiedlichen Autofluoreszenz (AF) der Granula können diese innerhalb des RPE-Zellkörpers klassifiziert, sowie deren Anzahl und Dichte analysiert werden. Diese Analyse wird in Altersgruppen und Retinalokalisationen differenziert. Zudem sind direkte Vergleiche zwischen der Histologie (SIM, ex vivo) und klinischen Aufnahmen (Fundusautofluoreszenz, in vivo) kaum existent. Durch Ermittlung der Gesamt-AF pro Zelle in Korrelation zu der intrazellulären Granuladichte und -verteilung soll eine neue Interpretationsebene ermöglicht werden.
Diese Arbeit soll helfen anhand der gewonnenen Daten die Stoffwechselmechanismen der Retina und deren Einfluss auf die Fundusautofluoreszenz (FAF) besser verstehen zu können. Sie soll insbesondere dazu beitragen bestehende und neue klinische FAF-Bildgebungsverfahren zu validieren, die Diagnostik pathologischer Prozesse der Retina zu optimieren und sowohl eine möglichst frühe Erkennung als auch präzise Prognostik zu ermöglichen.
Zudem sollen die Daten eine belastbare Basis darstellen, um die mit einem hohen Zeitaufwand verbundene manuelle Zellanalyse einer geschulten künstlichen Intelligenz zu überlassen. Damit könnte der Analyseprozess von Gewebeproben immens beschleunigt werden und in seiner Effizienz maximiert werden.
A cyclic alkyl(amino)carbene (CAAC)‐stabilized dicoordinate aminoborylene is synthesized by the twofold reduction of a [(CAAC)BCl\(_{2}\)(TMP)] (TMP=2,6‐tetramethylpiperidyl) precursor. NMR‐spectroscopic, X‐ray crystallographic and computational analyses confirm the cumulenic nature of the central C=B=N moiety. Irradiation of [(CAAC)B(TMP)] (2) resulted in an intramolecular C−C bond activation, leading to a doubly‐fused C\(_{10}\)BN heterocycle, while the reaction with acetonitrile resulted in an aryl migration from the CAAC to the acetonitrile nitrogen atom, concomitant with tautomerization of the latter to a boron‐bound allylamino ligand. One‐electron oxidation of 2 with CuX (X=Cl, Br) afforded the corresponding amino(halo)boryl radicals, which were characterized by EPR spectroscopy and DFT calculations. Placing 2 under an atmosphere of CO afforded the tricoordinate (CAAC,CO)‐stabilized aminoborylene. Finally, the twofold oxidation of 2 with chalcogens led, in the case of N\(_{2}\)O and sulfur, to the splitting of the B−C\(_{CAAC}\) bond and formation of the 2,4‐diamino‐1,3,2,4‐dichalcogenadiboretanes and CAAC‐chalcogen adducts, whereas with selenium a monomeric boraselenone was isolated, which showed some degree of B−Se multiple bonding.
Diese Arbeit beschäftigt sich mit der Synthese und Charakterisierung von mehrfach perfluoralkylierten Verbindungen.
Das erste Kapitel behandelt die Kupfer-vermittelte mehrfache Pentafluorethylierung von aromatischen Systemen, sowie die Untersuchung deren Folgechemie. Dabei wurden iodierte Aryl-Derivate mit dem Kupferorganyl CuC2F5 umgesetzt. Mit dieser Methode konnten symmetrisch und unsymmetrisch pentafluorethylierte Anilin- und Phenol-Derivate dargestellt werden. Die Anilin-Derivate wurden zu den entsprechenden Diazoniumsalzen umgesetzt, welche zunächst vollständig charakterisiert und anschließend deren Folgechemie untersucht wurde.
Das zweite Kapitel behandelt die Darstellung von Bis(trifluormethyl)sulfon durch elektrochemische Fluorierung mittels des Simons-Prozesses. Dabei wurde der Umsatz der Reaktion durch Verwendung der teilfluorierten Verbindung (Trifluormethyl)methylsulfon als Startmaterial optimiert.
This work presents excited state investigations on several systems with respect to experimental
spectroscopic work. The majority of projects covers the temporal evolution of
excitations in thin films of organic semiconductor materials. In the first chapters, thinfilm
and interface systems are build from diindeno[1,2,3-cd:1’,2’,3’-lm]perylene (DIP)
and N,N’-bis-(2-ethylhexyl)-dicyanoperylene-3,4:9,10-bis(dicarboximide) (PDIR-CN2)
layers, in the third chapter bulk systems consist of 4,4’,4”-tris[(3-methylphenyl)phenylamino]
triphenylamine (m-MTDATA), 4,7-diphenyl-1,10-phenanthroline (BPhen) and
tris-(2,4,6-trimethyl-3-(pyridin-3-yl)phenyl)borane (3TPYMB). These were investigated
by aggregate-based calculations. Careful selection of methods and incorporation
of geometrical relaxation and environmental effects allows for a precise energetical assignment
of excitations. The biggest issue was a proper description of charge-transfer
excitations, which was resolved by the application of ionization potential tuning on
aggregates. Subsequent characterization of excitations and their interplay condenses
the picture. Therefore, we could assign important features of the experimental spectroscopic
data and explain differences between systems.
The last chapter in this work covers the analysis of single molecule spectroscopy on
methylbismut. This poses different challenges for computations, such as multi-reference
character of low-lying excitations and an intrinsic need for a relativistic description.
We resolved this by combining complete active space self-consistent field based methods
with scalarrelativistic density-functional theory. Thus we were able to confidently
assign the spectroscopic features and explain underlying processes.
Rationale: Social factors are considered important for the initiation and maintenance of drug abuse. Virtual reality (VR) research on cue reactivity and exposure frequently incorporates social stimuli as part of complex drug-intake scenarios. Attempts are rarely made to dissect the impact of the different components and their interactive effects. The present study critically extends this line of research by investigating the modulatory effects of social context on the reactivity evoked by proximal smoking cues.
Methods: Thirty-two smokers and 33 never-smokers were presented in VR with proximal cues and neutral stimuli, embedded in a social context or a neutral context. A virtual hand model was used to translate real hand movements into VR. Each trial started with the presentation of the different stimulus–context combinations. Discrete stimuli were presented on the table in front of the participants, and contextual stimuli were presented at the end of the table. Afterward, participants were instructed to grasp the target stimulus (a cigarette vs. a pencil) in front of them. After successful contact, the stimulus appeared in the virtual hand. Modulation of cue reactivity by social context was assessed by self-report, physiological measures, and overt approach behavior.
Results: The results revealed modulatory effects of social context on the responses to proximal smoking cues in smokers. In contrast to never-smokers, smoking cues evoked craving in smokers, which was attenuated in a social context. Furthermore, social context increased the latency to approach and contact the cigarette in the group of smokers but did not affect behavioral approach responses in never-smokers. Other data provided indications for interactive, but also main effects of cues and contexts. Interestingly, cue-evoked craving was increased after contact with the virtual cigarette.
Conclusion: The present study critically extends previous research by providing evidence for the modulation of cue reactivity by social context. The results are particularly important given the well-established role of drug-associated environmental contexts in the stimulus control of addictive behaviors. Our results emphasize the need to address social context effects on cue reactivity in basic research and treatment and further suggest that changes in the perceived availability of smoking might enhance or inhibit cue-evoked reactivity.
Emotional shifts are often a fundamental part of the narrative experience and engrained into the schematic structures of stories. Recent theoretical work suggests that these shifts are key for narrative influence and are interconnected with transportation, a known mechanism of narrative effects. Empirical research examining this proposition is still scarce, inconclusive, and lacking measures that assess the experience of emotional shifts throughout a narrative to explain effects. This thesis aims to contribute to this research lacuna and investigates the link between emotional shifts, transportation, and story-consistent outcomes using different methods to measure emotional shifts in the moment they occur (Manuscript #1 and #2), and using various narrative stimuli (audiovisual, written, auditive).
Manuscript #1 uses real-time-response (RTR) measurement to examine the relationship of valence shifts experienced during film viewing with transportation and post-exposure self-reported emotional flow. Manuscript #2 reports a pilot study and two experiments in which a self-probed emotional retrospection task is used to measure the number and intensity of emotional shifts during reading. I investigate the effect of reviews on transportation, the link between transportation and emotional shifts, and their respective associations with story-consistent attitudes, social sharing intentions, and donation behavior. In Manuscript #3, narrative structures are manipulated. Two experiments examine the effects of audio stories with shifting (positive-negative-positive) vs. positive-only emotional trajectories on the experience of happiness- and sadness-shifts, transportation, and post-exposure emotional flow.
Transportation was positively linked to valence shifts (M#1), and the number and intensity of emotional shifts (M#2), and emotional flow (M#1, M#3). In M#3, transportation was predicted by shifts in happiness, but not sadness. Emotional flow was linked to shifts in happiness, sadness, and RTR valence (M#1, M#3). Emotional shifts and transportation were associated with social sharing intentions, but only transportation was linked to some story-consistent attitudes (affective attitudes in particular).
CRISPR-Cas systems are highly diverse and canonically function as prokaryotic adaptive immune systems. The canonical resistance mechanism relies on spacers that are complementary to the invaders' nucleic acids. By accidental incorporation or other mechanisms, prokaryotes can also acquire self-targeting spacers that are complementary to their own genome. As self-targeting commonly leads to lethal autoimmunity, the existence of self-targeting spacers poses a paradox. In Chapter 1, we provide an overview of the prevalence of self-targeting spacers, summarize how they can be incorporated, and which means can be employed by the host to evade lethal self-targeting. In addition, we outline alternative functions of CRISPR-Cas systems that are associated with self-targeting spacers. Whether CRISPR-Cas systems can efficiently target their own genome depends heavily on the presence of protospacer adjacent motifs (PAMs) next to the target region. In Chapter 2, we developed a method to determine PAM requirements. Thereby, we specifically focused on type I systems that engage multi-protein complexes, which are challenging to assess. Using the cell-free transcription-translation (TXTL) system, we developed an enrichment-based binding assay and validated its reliability by examining the well-known PAM requirements of the E. coli type I-E system. In Chapter 3, we applied the TXTL-based PAM assay to assess 16 additional CRISPR-Cas systems. These 16 systems included three CRISPR-Cas associated transposons (CASTs). CASTs are recently discovered transposons that employ CRISPR-Cas systems in a non-canonical function for the directed integration of the transposon. To further characterize CASTs in TXTL outside their PAM requirements, we reconstituted the transposition of CASTs in TXTL. In Chapter 4, we turned to non-canonical self-targeting CRISPR-Cas systems, which were already discussed in Chapter 1. While investigating how the plant pathogen Xanthomonas albilineans survives self-targeting by its two endogenous CRISPR-Cas systems, we identified multiple putative anti-CRISPR proteins (Acrs) in the genome of X. albilineans. Two of the Acrs, named AcrIC11 and AcrIF12Xal, inhibited degradation by their respective CRISPR-Cas systems but still retained Cascade-binding ability, and appear responsible for the lack of autoimmunity in X. albilineans. In summary, we developed new technologies that eased the investigation of non-canonical multi-component systems and, if applied to additional systems, might reveal unique properties that could be implemented in new CRISPR-Cas based tools.
Altersbedingte Makuladegeneration (AMD) ist weltweit die häufigste Ursache von irreversibler Erblindung des alternden Menschen. Mit der anti-VEGF-Behandlung steht für die deutlich seltenere feuchte AMD eine zugelassene Therapie bereit, die deutlich häufigere trockene AMD entzieht sich aktuell jedoch jeglicher Therapie. Ein zentraler Pathomechanismus der AMD ist der progrediente Untergang des retinalen Pigmentepithels (RPE). Die Rarifizierung und letztendlich Atrophie des RPEs führt zum Untergang der funktionellen Einheit aus RPE, Photorezeptoren und Bruch’scher Membran und somit zum irreversiblen Funktionsverlust. Ein möglicher therapeutischer Ansatz, der progredienten Atrophie des RPEs entgegenzuwirken, ist, das prinzipiell post- mitotischen RPE zur Proliferation anzuregen.
Grundlage unserer in vitro Untersuchungen ist das ARPE-19 Zellmodell. Um die Proliferation anzuregen wurden die RPE-Zellen mit E2F2, einem Zellzyklus- regulierendem Transkriptionsfaktor, transfiziert.
Zunächst wurde ein nicht-proliferatives RPE-Zellmodell mit spontanem Wachstumsarrest etabliert. Innerhalb von zwei Wochen konnte die Ausbildung von Zonulae occludentes als Zeichen der Integrität des adhärenten Zellmonolayers beobachtet werden. Die chemische Transfektion von E2F2 unter einem CMV-Promoter führte zur Überexpression von E2F2-Protein. Der proliferationssteigernde Effekt von E2F2 konnte durch die Proliferationsmarker Cyclin D1 sowie Ki67, dem Anstieg der BrdU-Aufnahme und der nach Transfektion mit E2F2 zunehmenden Gesamtzellzahl nachgewiesen werden.
Der Zellzahlerhöhung standen jedoch potentiell qualitative und funktionelle Einbußen entgegen. So zeigten sich nach Behandlung mit E2F2 die Zellviabilität reduziert und die Apoptoserate sowie die Permeabilität des Epithels erhöht. Diese Einschränkungen waren jedoch nur passager bis 7 Tage nach Transfektion sichtbar und reversibel. Unsere Ergebnisse weisen darauf hin, dass diese Defizite nicht durch E2F2 selbst, sondern durch das Transfektionsreagenz PEI bedingt waren. Weitere funktionelle Defizite könnten durch epithelial-mesenchymale Transition (EMT) verursacht werden. Hier zeigte sich durch E2F2 keine De-Differenzierung im Sinne einer typischen EMT-Marker- Expression.
Die vorliegende Arbeit zeigt in einem in vitro Zellmodell die Grundlagen eines vielversprechenden Ansatzes zur Therapie der trockenen AMD: Durch Überexpression eines den Zellzyklus regulierenden Gens (hier E2F2) wurde die RPE-Regeneration angeregt. Analog zur schon zugelassenen Gentherapie des RPEs bei RPE65-assoziierten Netzhautdystrophien durch den Transfer von funktionstüchtigem RPE65-Gen mittels Adeno-assoziierten Viren könnte mittels E2F2, übertragen mit einem lentiviralen Verktor, eine Stimulation des RPEs zur Proliferation möglich sein. Entscheidend ist der möglichst gute Struktur- und Funktionserhalt des Photorezeptor-Bruch-Membran-RPE Komplexes. Eine Therapie sollte daher in frühen Krankheitsstadien erfolgen, um die Progression zu fortgeschrittenen Erkrankungsstadien mit irreversiblem Funktionsverlust zu verzögern oder zu verhindern.
Propofol is a widely used general anesthetic in clinical practice, but its use is limited by its water-insoluble nature and associated pharmacokinetic and pharmacodynamic limitations. Therefore, researchers have been searching for alternative formulations to lipid emulsion to address the remaining side effects. In this study, novel formulations for propofol and its sodium salt Na-propofolat were designed and tested using the amphiphilic cyclodextrin (CD) derivative hydroxypropyl-β-cyclodextrin (HPβCD). The study found that spectroscopic and calorimetric measurements suggested complex formation between propofol/Na-propofolate and HPβCD, which was confirmed by the absence of an evaporation peak and different glass transition temperatures. Moreover, the formulated compounds showed no cytotoxicity and genotoxicity compared to the reference. The molecular modeling simulations based on molecular docking predicted a higher affinity for propofol/HPβCD than for Na-propofolate/HPβCD, as the former complex was more stable. This finding was further confirmed by high-performance liquid chromatography. In conclusion, the CD-based formulations of propofol and its sodium salt may be a promising option and a plausible alternative to conventional lipid emulsions.
Social patterns and roles can develop when users talk to intelligent voice assistants (IVAs) daily. The current study investigates whether users assign different roles to devices and how this affects their usage behavior, user experience, and social perceptions. Since social roles take time to establish, we equipped 106 participants with Alexa or Google assistants and some smart home devices and observed their interactions for nine months. We analyzed diverse subjective (questionnaire) and objective data (interaction data). By combining social science and data science analyses, we identified two distinct clusters—users who assigned a friendship role to IVAs over time and users who did not. Interestingly, these clusters exhibited significant differences in their usage behavior, user experience, and social perceptions of the devices. For example, participants who assigned a role to IVAs attributed more friendship to them used them more frequently, reported more enjoyment during interactions, and perceived more empathy for IVAs. In addition, these users had distinct personal requirements, for example, they reported more loneliness. This study provides valuable insights into the role-specific effects and consequences of voice assistants. Recent developments in conversational language models such as ChatGPT suggest that the findings of this study could make an important contribution to the design of dialogic human–AI interactions.
Der Lebensmittelonlinehandel in Deutschland gewann, verstärkt durch die Covid-19-Pandemie, an Umsatzanteilen im Lebensmitteleinzelhandel. Hierdurch wurden neue Anforderungen an Arbeit und Beschäftigung in Deutschland geschaffen. Insbesondere in urbanen Räumen hat die Lebensmittelzustellung durch neu entstandene Betriebsformen zugenommen. So entstehen durch das Versprechen der Betriebe, Lebensmittel in kurzen Zeiträumen zu liefern, verschiedene Logistikstandorte und u.a. urbane Fahrradlieferdienste. Während Medien und Gewerkschaften bereits vor der Entstehung prekärer Arbeitsbedingungen warnen, sind die genauen Auswirkungen des Lebensmittelonlinehandels auf die Entwicklung neuer Arbeitsstandorte und die dort stattfindende Beschäftigung nur unzureichend bekannt. Diese Arbeit untersucht den Lebensmittelonlinehandel anhand seiner Betriebsformen, Standorte und Arbeitsprozesse sowie deren Auswirkungen auf Beschäftigte in Deutschland. Den konzeptionellen Hintergrund bilden Arbeiten der geographischen Handelsforschung sowie Debatten zu Arbeitsplatzqualität und Beschäftigung. Für die Analyse sind Primärdaten und Sekundärdaten erhoben worden. Es zeigt sich, dass teilweise komplexe Betriebsformen entstehen, bei denen sich die Arbeit und Arbeitsorte verändern. Zudem entstehen neue Herausforderungen für die Beschäftigten (u.a. physische und psychische Belastung), welche in dieser Arbeit identifiziert werden.
Diese Arbeit untersuchte die Wirkung von bakteriellen Substanzen auf essenzielle
thrombozytäre Funktionen. Bei den Substanzen handelte es sich um Toxine von
Bakterien, die mutmaßlich zur Pathogenese der Parodontitis beitragen.
Während LTX von Bakterium A. actinomycetemcomitans und C14 von F. nucleatum
zur Hemmung der Aggregation und zur Stimulation inhibitorischer Systeme beiträgt,
induziert LPS von P. gingivalis eine leichte Aktivierung der Thrombozyten,
gekennzeichnet durch eine gering verstärkte P-Selektin-Expression.
Untersucht wurde der Einfluss mehrerer Chemotherapeutika auf den Chemokinrezeptor CXCR4 in
Myelomzelllinien auf Ebene des Promotors, der mRNA und der Rezeptorverteilung, wobei drei
Substanzen (Etoposid, Bortezomib und Dexamethason) als potenzielle Suppressoren des Promotors ausgemacht werden konnten. Abhängig vom Myelom-Zelltyp und der Dosierung können so evtl.
Rückschlüsse auf die beobachtete Suppression von CXCR4 bei erkrankten Patienten mit hoher CXCR4-Aktivität (hier: Malignes Myelom) durch die begleitende Chemotherapie gezogen werden, welche eine Diagnostik und Therapie bei diesen Patienten erschwert.
Hintergrund: Hintergrund für diese Arbeit waren Beobachtungen in klinischen Fallstudien von Lapa et al. am Universitätsklinikum Würzburg, die sich auf CXCR4 bezogen, welches u.a. bei Patienten mit
Multiplem Myelom überexprimiert wird und dadurch bereits als Target für Diagnostik und Therapie in der Klinik Anwendung findet. Dabei konnte bei PET-CT Untersuchungen in der Nuklearmedizin beobachtet werden, dass es durch die begleitende Chemotherapie der Patienten zu einer Suppression des markierten CXCR4-Signals kam, so dass es nicht mehr zur Verlaufsbeobachtung und
vor allem nicht mehr zur Radiotherapie und Therapiekontrolle verwendet werden konnte.
Um den Einfluss und mögliche Interaktionen der Chemotherapeutika auf CXCR4 zu untersuchen, war es Ziel dieser Arbeit, ein vergleichbares Szenario in-vitro nachzustellen und Einflüsse messbar zu
machen, um so mögliche Ansätze und Verbesserungsvorschläge für die klinische Anwendung zu
liefern.
Methoden/Ergebnisse: Hierfür wurden im ersten Teil INA-6 (Myelomzellen) und Mesenchymale
Stammzellen (MSC) kultiviert, in Ko-Kultur gebracht und nach einer bestimmten Zeit wieder getrennt, um anschließend den gegenseitigen Einfluss in Bezug auf CXCR4 zu messen. Zudem wurde der Einfluss von Dexamethason untersucht. Es zeigte sich eine enge Bindung zwischen INA-6 und MSC
sowie eine hohe CXCR4-Aktivität bei INA-6, jedoch konnte keine Induktion der CXCR4-Aktivität in MSC durch INA-6-Kontakt oder Dexamethason quantifiziert werden. Die Immunzytologie erwies sich aufgrund einer schweren Anfärbbarkeit von CXCR4 – auch mit verschiedensten Antikörpern und sogar Liganden-gekoppeltem Farbstoff– als kaum auswertbar, wobei eine Darstellung von CXCR4
generell aber gelang.
Der CXCR4-Promotor wurde mittels Software genauer analysiert, wobei einige relevante Bindestellen, u.a. für Glukokortikoide und NFkB gefunden wurden. Die Herstellung eines CXCR4-
pGl4.14-Promotor-Konstrukts war erfolgreich, ebenso dessen Einschleusung in Myelomzellen. Auch gelang die Herstellung stabiler transfizierter INA-6, sodass mit diesen anschließend konstantere Ergebnisse erzielt werden konnten.
Im größten Teil der Arbeit wurden geeignete Chemotherapeutika-Konzentrationen ermittelt und in Viabilitäts- und Apoptose-Versuchen überprüft. Die Stimulationsversuche mit diesen zeigten variable
Effekte abhängig vom Zelltyp (INA-6, MM1S), jedoch konnten Bortezomib, Etoposid und
Dexamethason konzentrationsabhängig als starke Suppressoren der CXCR4-Aktivität ausgemacht
werden, was sich v.a. auf Ebene der Promotoraktivität – gemessen mittels Luciferase - zeigte. Interpretation: In-vitro konnten somit drei potenzielle Suppressoren der CXCR4-Aktivität ausgemacht
werden: Etoposid, Bortezomib und Dexamethason. Zumindest beim INA-6-Zelltyp fiel dieser Effekt deutlich aus, wobei in der Klinik der entsprechende Zelltyp sowie die Dosierung der Medikamente berücksichtigt werden müssen. Hinzu kommen weitere Einflussfaktoren des menschlichen Körpers,
die nicht berücksichtig werden konnten. Die genauen Mechanismen der Suppression könnten sich aus den Bindestellen des Promotors erklären, die von uns analysiert wurden, aber auf die in weiteren Arbeiten noch näher eingegangen werden muss.
Die Menisken sind ein vitaler Bestandteil für die Stabilität und Mobilität des Kniegelenks. Verletzungen des Meniskus weisen eine hohe Prävalenz in der Bevölkerung auf. Schätzungsweise sind bis zu 25% der Erwachsenen in den USA betroffen. Auch in Deutschland wird die Meniskusruptur mittlerweile als Berufskrankheit anerkannt.
Die Studie ist als retrospektive Registerstudie designt. Alle Patienten wurden im Zeitraum vom 08.01.2009 bis zum 23.12.2019 am Universitätsklinikum in Würzburg operiert. Insgesamt schlossen wir 361 Patienten ein.
Unter Ausschluss von Begleitverletzungen und Knochenmarksödemen konnten 41,6% der eingeschlossenen Fälle als isolierte Meniskusläsionen eingestuft werden, insbesondere bei jüngeren Patienten (<40 Jahre) ließ sich zudem ein adäquates Trauma nachweisen.
Mögliche Risikofaktoren wurden auf deren Einfluss für eine Reläsion untersucht. Dabei stellte sich unter den Variablen BMI, Alter und OP-Technik lediglich letztere als ein signifikanter Faktor heraus (logRank von 0,019 5-Jahre-Follow-up; logRank von <0,001 10-Jahre- Follow-up).
Die Diagnostik mittels MRT als Goldstandard und die Überprüfung derer Befunde in der Arthroskopie wiesen einen deutlichen Abfall der Sensitivität vom Innen- zum Außenmeniskus auf. Interessanter sind die Fälle, in denen eine Läsion übersehen wurde, falls auf dem anderen Meniskus eine Läsion festgestellt wurde.
Zusammenfassend zeigt unsere Studie eindeutig, dass es isolierte Meniskusläsionen gibt. Auch Nahtverfahren, welche sich gerade weiterhin im Aufschwung befinden, müssten weiter auf die höheren Reläsionsraten untersucht und beobachtet werde. BMI als Risikofaktor für ein Therapieversagen bleibt weiterhin zu diskutieren auch mit Einbezug von sportlicher und körperlicher Aktivität. MRT als Goldstandard der nichtinvasiven Diagnostik wird unverändert bleiben. Jedoch sollte ein Fokus darauf geworfen werden, wann und unter welchen Umständen Läsionen übersehen werden. Dies erfordert weitere speziell dafür ausgerichtete Ausarbeitungen.
Die bikuspide Aortenklappe ist als häufigster angeborener Klappenfehler bei Erwachsenen eine relevante Diagnose nicht nur im Fachgebiet der Herz-Thorax-Chirurgie. Etwa die Hälfte aller Patienten mit dieser Klappenanomalie entwickelt im Verlauf eine aneurysmatische Dilatation der thorakalen aszendierenden Aorta, was auch bikuspide Aortopathie genannt wird. Dieses Aneurysma kann anhand seiner Lokalisation in verschiedene Phänotypen unterteilt werden. Bis heute sind sowohl bei der Erforschung der Entstehung der bikuspiden Aortopathie als auch bei deren Therapie noch viele Fragen offen und es fehlt an klaren Leitlinien, um einen individualisierten Behandlungsansatz für den einzelnen Patienten bereitstellen zu können.
Ziel unserer Studie war es, durch Vergleiche klinischer Parameter die aktuell angewendete Praxis der chirurgischen Therapie zu evaluieren sowie Ansatzpunkte für zukünftige individuellere Risikoabschätzung herauszuarbeiten. Hierfür untersuchten wir Patienten, die an einem Aneurysma der aszendierenden Aorta operiert worden waren, aufgeteilt nach Patienten mit bikuspiden und trikuspiden Klappen.
Präoperativ stellten wir folgende signifikante Unterschiede fest: Bikuspide Patienten waren jünger, wiesen öfter arterielle und pulmonale Hypertonie auf, zeigten geringere Aneurysma-Durchmesser und hatten häufiger eine stenotische Klappe als trikuspide Patienten. Für alle Patienten zeigte sich eine Korrelation von Aortenwurzel-Durchmesser und BSA.
Im unmittelbar postoperativen Verlauf fand sich hinsichtlich der Komplikationen und 30-Tage-Mortalität ein ähnlich guter Outcome für beide Klappenmorphologien sowie die verschiedenen angewendeten Operationsverfahren. Eine bikuspide Aortenklappe kann daher aktuell nicht per se als Faktor für ein erhöhtes perioperatives Risiko gesehen werden und die derzeitige klinische Praxis ist für die betroffenen Patienten eine sichere Vorgehensweise.
Orthopteran diversity in steep slope vineyards: the role of vineyard type and vegetation management
(2023)
The abandonment of traditional agricultural practices and subsequent succession are major threats to many open-adapted species and species-rich ecosystems. Viticulture on steep slopes has recently suffered from strong declines due to insufficient profitability, thus increasing the area of fallow land considerably. Changing cultivation systems from vertically oriented to modern vineyard terraces offers an opportunity to maintain management economically viable and thus reduces further abandonment. Hillside parallel terraces favor mechanization, and their embankments offer large undisturbed areas that could provide valuable habitats. We investigated the effects of vineyard abandonment, different vineyard management types (vertically oriented vs. terraced), and local parameters on Orthoptera diversity in 45 study sites along the Upper Middle Rhine Valley in Germany. Our results show that woody structures and vineyard abandonment reduced Orthoptera diversity at the local and landscape scale due to decreased habitat quality, especially for open-adapted species. In contrast, open inter-rows of actively managed vineyard types supported heat-adapted Caelifera species. On terrace embankments, extensive management and taller vegetation benefited Ensifera species, while short and mulched vegetation in vertically oriented vineyards favored the dominance of one single Caelifera species. Our results highlight the significance of maintaining viticultural management on steep slopes for the preservation of both open-adapted Orthoptera species and the cultural landscape.
Frequenzabhängigkeit der IP3-induzierten Calciumregulation in murinen ventrikulären Kardiomyozyten
(2023)
In Kardiomyozyten ist Calcium (Ca2+) ein wichtiges Signalmolekül und eine präzise Regulation der Ca2+ Konzentration in den Zellkompartimenten erforderlich. Ca2+ wird Angiotensin II-induziert und vom Botenstoff IP3 vermittelt aus IP3 Rezeptoren des Sarkoplasmatischen Retikulum (SR) freigesetzt, was zur mitochondrialen Ca2+ Aufnahme führt. Diese Kommunikationswege zwischen SR und Mitochondrium sind u.a. bei der Herzinsuffizienz durch pathologische Umbauprozesse gestört. Zudem zirkulieren bei Herzinsuffizienz vermehrt Hormone wie AngII, welches u.a. die intrazelluläre IP3 Konzentration steigert und als Hypertrophie Signal wirkt. Dieser Arbeit geht die Vermutung voraus, dass eine gestörte mitochondriale Ca2+ Aufnahme durch Veränderung des nukleären Ca2+ Transienten die hypertrophe Genexpression beeinflussen kann. Es wurde an ventrikulären Kardiomyozyten von adulten Mäusen mit kardiospezifischem MCU Knock out oder MCU Wildtyp untersucht, wie sich Ca2+ Transienten in Zytosol und Nukleus bei AngII-Stimulation und Störung der mitochondrialen Ca2+ Aufnahme durch Blockade des mRyR1 oder des MCU verändern. Zum Vergleich wurde der Effekt des β adrenerg vermittelten, IP3 unabhängigen Ca2+ Anstiegs beobachtet. Zur Untersuchung der Frequenzabhängigkeit der Effekte wurde die elektrische Stimulation wurde variiert. Die Arbeit zeigt, dass sich die Blockade der mitochondrialen Ca2+ Aufnahme unterschiedlich auf den nukleären Ca2+ Transienten auswirkt: Bei AngII-Stimulation kam es in Folge der Blockade des mRyR1, nicht aber des MCU, zur Steigerung des nukleären Ca2+ Transienten. Dieser Effekt war bei 1 Hz Stimulationsfrequenz, nicht aber nach einer Steigerung auf 4 Hz zu beobachten. Bei β adrenerger Stimulation hingegen veränderte die Blockade des MCU oder des mRyR1 die Ca2+ Transienten im Kern nicht signifikant. Die Arbeit verdeutlicht die Bedeutung der IP3 vermittelten Ca2+ Freisetzung für die Kontrolle der Ca2+ Konzentrationen in unterschiedlichen zellulären Kompartimenten.
Körperpsychotherapie etabliert sich zunehmend und ist keine neue Entdeckung. Bereits vor über 120 Jahren war bekannt, dass über den Körper die Psyche erreicht werden kann und damit die verbale Psychotherapie effektiver und gegebenenfalls erst möglich wurde. Wissenschaftliche Untersuchungen sprechen dafür, dass Körperpsychotherapie heute als fünfte Säule der allgemein anerkannten psychotherapeutischen Verfahren (PA, TP, VT, ST) angesehen werden kann. Sie hat sich aus der atemtherapeutischen und der Bewegung der Gymnastik sowie der Verwendung in der Psychoanalyse entwickelt. Sie ist weitestgehend in die tiefenpsychologische und verhaltenstherapeutische Psychotherapie integriert und kann zu den humanistischen Verfahren gezählt werden. Anwendung findet die Körperpsychotherapie beispielsweise in der Psychosomatischen Medizin sowie auf verschiedenen Gebieten der Psychotherapie. Laut den hier vorgelegten Befunden erreicht die Arbeit am Körper nonverbal Verarbeitetes, das sich tief in das implizite Körpergedächtnis eingegraben hat, lange bevor ein junger Mensch das Sprechen erlernte. Eine Möglichkeit, dies konzeptuell einzuordnen und therapeutisch nutzbar zu machen, ist das Modell der „verkörperten Selbstwahrnehmung“ nach Fogel, das Teile des Körperschemas beinhaltet. In der Bindungsbeziehung nicht adäquates Eingehen auf die kindlichen Bedürfnisse hat weitreichende Folgen auf das weitere Leben. In Untersuchungen konnte gezeigt werden, wie sich Störungen in der Entwicklung eines Kindes in Form von Körperschemastörungen und Körperdissoziationen, in Emotionsregulations- und als Entwicklungstraumastörung manifestieren können. Diese sind weit verbreitet und Teil einer Gesellschaft, die auf Leistung und Effizienz ausgerichtet ist und in Zusammenhang mit chronischem Stress stehen. Evolutionsgeschichtlich begründete Überlebensmuster werden durch chronischen Stress aktiviert und sind Ursache zahlreicher Erkrankungen. Hierfür liefert Porges mit seiner Polyvagal-Theorie einen neuen neurobiologischen Erklärungsansatz. Durch eine Imbalance stressauslösender und entspannender Faktoren zugunsten des Stresses werden körpereigene Selbstheilungskräfte der Selbstregulation verhindert und die Resilienzfähigkeit eingeschränkt. Selbstregulation und Resilienz sind vorhanden, wenn das Ruhe- und Bindungssystem dominiert im Gegensatz zur Kampf-, Flucht- und Erstarrungsreaktion. In seiner Hypothese zeigt Porges auf, wie das autonome Nervensystem Verhaltensweisen beeinflusst und wie diesen begegnet werden kann. Durch den sympathischen Zweig wird die An- und Verspannungsreaktion auf körperlicher Seite mit den auch auf der psychischen Seite verbundenen Reaktionen vermittelt. Diesem kann durch die parasympathisch vermittelte Oxytocin-Freisetzung begegnet werden. Durch eine Balance dieser beiden Waagschalen kann körperliche und seelische Gesundheit sowie Resilienzfähigkeit gefördert werden. Die Körperpsychotherapie bietet auch aus meiner Sicht eine noch unterschätzte Möglichkeit, die Balance wieder herzustellen. Eine Methode, die positive durch Oxytocin vermittelte heilsame Reaktionen in Gang zu setzt, stellt die berührende Körperarbeit dar wie sie beispielsweise nach der Rosen-Methode praktiziert wird. Körperpsychotherapie im Allgemeinen kann in der Behandlung von Depressionen, Angst- und psychosomatischen Störungen hilfreich sein. Sie ist empirisch in einer umfassenden Theorie begründet und fundiert auf neurobiologischen und neurowissenschaftlichen Erkenntnissen. Aus Sicht der Autorin handelt es sich bei der Körperpsychotherapie angesichts der vorliegenden Befunde und theoretischen Wirkkonzepte um einen therapeutischen Ansatz, der wesentlich dazu beitragen kann, die Behandlung psychischer Störungen kosteneffizienter und wirksamer zu gestalten. Um differenzierter zwischen theoretischem Potential und tatsächlich nachweisbaren Effekten körperpsychotherapeutischer Methoden unterscheiden zu können, ist es aus meiner Sicht dringend zu empfehlen, körperpsychotherapeutische Arbeitsansätze exakter zu erforschen. Beispielsweise wäre es lang- oder mittelfristig auch wünschenswert, Forschungsdaten für eine präzisere Indikationsstellung zur Verfügung zu haben. Dabei wäre beispielweise zu klären, welche Verfahren für welche Störungsbilder, in welchem Behandlungssetting und für welche Behandlungsdauer in Frage kommen. Auch fehlen hinsichtlich der Kontraindikationen belastbare Forschungsdaten zu den oben benannten Empfehlungen diverser Vertreter der Körperpsychotherapie. Aufgrund des hohen Erklärungspotentials für das individuelle Erleben psychisch beeinträchtigter Personen, das beispielsweise die Polyvagal-Theorie nach Porges oder die verkörperte Selbstwahrnehmung nach Fogel bieten, erscheint mir auch die Forderung nach einer Berücksichtigung körperpsychotherapeutischer Theorien und Methoden in der Ausbildung von Ärzten und Psychologen nachvollziehbar und sinnvoll. Aufgrund der in dieser Arbeit zusammengetragenen Ergebnisse halte ich es für dringend empfehlenswert, die Körperpsychotherapie als eigenständiges Behandlungselement in die fachgerechte Versorgung psychisch Erkrankter aufzunehmen, sofern keine der erwähnten Kontraindikationen dem widersprechen.
Despite accounting for only a small proportion of all skin cancers, malignant melanoma
displays a serious health risk with increasing incidence and high mortality rate. Fortunately,
advances in the treatment of malignant melanoma now prolong survival and enhance response
and treatment efficacy. Established biomarkers help evaluate disease progression and
facilitate choosing appropriate and individual treatment options. However, the need for easily
accessible and reliable biomarkers is rising to predict patient-specific clinical outcome.
Eosinophil infiltration into the tumor and high peripheral eosinophil counts prior and during
treatment have been associated with better response in patients for various cancer entities,
including melanoma. An analysis of a heterogeneous study cohort reported high serum ECP
levels in non-responders. Hence, eosinophil frequency and serum ECP as a soluble
eosinophil-secreted mediator were suggested as prognostic biomarkers in melanoma. We
examined whether melanoma patients treated with first-line targeted therapy could also benefit
from the effects of eosinophils. In total, 243 blood and serum samples from patients with
advanced melanoma were prospectively and retrospectively collected before and after drug
initiation. To link eosinophil function to improved clinical outcome, soluble serum markers and
peripheral blood counts were used for correlative studies using a homogeneous study cohort.
In addition, functional and phenotypical characterizations provided insights into the expression
profile and activity of freshly isolated eosinophils, including comparisons between patients and
healthy donors.
Our data showed a significant correlation between high pre-treatment blood eosinophil counts
and improved response to targeted therapy and by trend to combinatorial immunotherapy in
patients with metastatic melanoma. In accordance with previous studies our results links
eosinophil blood counts to better response in melanoma patients. High pre-treatment ECP
serum concentration correlated with response to immunotherapy but not to targeted therapy.
Eosinophils from healthy donors and patients showed functional and phenotypical similarities.
Functional assays revealed a strong cytotoxic potential of blood eosinophils towards
melanoma cells in vitro, inducing apoptosis and necrosis. In addition, in vitro cytotoxicity was
an active process of peripheral eosinophils and melanoma cells with bidirectional features and
required close cell-cell interaction. The extent of cytotoxicity was dose-dependent and showed
susceptibility to changes in physical factors like adherence. Importantly, we provide evidence
of an additive tumoricidal function of eosinophils and combinatorial targeted therapy in vitro. In
summary, we give valuable insights into the complex and treatment-dependent role of
eosinophils in melanoma. As a result, our data support the suggestion of eosinophils and their
secreted mediators as potential prognostic biomarkers. It will take additional studies to
examine the molecular mechanisms that underlie our findings.
Bei Patienten mit Erkrankungen des blutbildenden Systems ist die hämatopoetische Stammzelltransplantation (HSZT) eine häufig eingesetzte kurative Therapie. Im Rahmen dieser Transplantation werden nicht nur vom Spender gewonnene hämatopoetische Stammzellen auf den Empfänger übertragen, sondern immer auch im peripheren Blut vorhandene T-Zellen. Dies kann zum einen einen positiven Effekt zum anderen aber auch negative Folgen für den transplantierten Patienten mit sich bringen. Eine negative Auswirkung wäre die sogenannte Graft-vesus-Host Disease (GvHD), bei der die T-Zellen des Spenders Zellen des Empfängers als fremd erkennen und angreifen. Klinisch manifestiert sich dies vor allem an Leber, Haut und Darm mit Ikterus, Dermatitiden und Diarrhoen. Einen gewünschten Effekt, den die übertragenen T-Zellen vor allem bei Patienten mit akuter myeloischer Leukämie (AML) mit sich bringen können, ist der sogenannte Graft-versus-Leukemia (GvL) Effekt. Dabei richten sich vom Spender stammende Immunzellen gegen die Tumorzellen des Empfängers und senken damit das Rezidivrisiko der Leukämie.
In verschiedenen Studien konnte eine positive Korrelation von CMV-Reaktivierung nach HSZT und einem niedrigerem Rezidivrisiko der hämatopoetischen Grunderkrankung gezeigt werden. Diese Doktorarbeit widmet sich auf Grundlage dessen der Frage, ob Cytomegalievirus (CMV)-spezifische cytotoxische T-Zellen (CTL) direkt durch Kreuzreaktivität zum GvL-Effekt beitragen.
Zunächst wurden periphere mononukleäre Zellen (PBMC) aus dem Blut neun gesunder Spender isoliert, die als CMV-seropositiv ausgetestet wurden. Diese wurden mit dem CMVpp65-(NLVPMVATV)-Einzelpeptid stimuliert und in Kultur angereichert. Zusätzlich wurden die expandierten CMV-spezifischen CTL durch eine spezifische Selektion über den Aktivierungsmarker CD137 weiter angereichert. Nach Expansion und Anreicherung zeigten jeweils 75% (Spender 1), 67% (Spender 2), 74% (Spender 3), 86% (Spender 4), 81% (Spender5), 80% (Spender 6), 84% (Spender 7), 51% (Spender 8) und 69% (Spender 9) der CD3+/CD8+-T-Zellen eine IFN-γ-Produktion und CD107a-Expression nach Stimulation mit dem CMVpp65-Einzelpeptid. IFN-γ als Effektormolekül der zytotoxischen Granula der CTL und CD107a als Degranulationsmarker beweisen die spezifische Zytotoxizität. Somit konnte die erfolgreiche Anreicherung funktionsfähiger CMVpp65-spezifischer CTL gezeigt werden. Um zu untersuchen, ob diese nun kreuzreaktiv tumorassoziierte Antigene (TAA) erkennen, wurden sie ebenfalls mit folgenden TAA stimuliert: WT1, Proteinase 3, PRAME, NY-ESO, Muc1 und Bcl-2. Die Stimulation erfolgte entweder über die direkte Zugabe von Einzelpeptiden bzw. Peptidpools oder über die Beladung und Präsentation dieser Peptide bzw. Peptidpools über dendritische Zellen (DC). Die DC wurden aus Monozyten des jeweiligen Spenders generiert. Im Falle von drei Spendern zeigt sich ebenfalls eine deutliche zytotoxische Funktion nach Stimulation mit dem WT1-(DFKDCERRF)-Einzelpeptid durch IFN-γ-Produktion und CD107a-Expression bei 75% (Spender 1), 35% (Spender 4) und 33% (Spender 7) der CD3+/CD8+-T-Zellen. Wie zuvor erwähnt lag der Anteil der CD3+/CD8+-T-Zellen mit spezifischer Zytotoxizität nach Stimulation mit dem CMVpp65-(NLVPMVATV)-Einzelpeptid bei diesen drei besagten Spendern bei 74% (Spender1), 86% (Spender 4) und 84% (Spender7). So ergab sich für diese drei Spender eine gemeinsame Schnittmenge von 48,92% (Spender 1), 21,07% (Spender 4) und 17,45% (Spender 7) derjenigen Zellen, die sowohl nach Stimulation mit CMVpp65-(NLVPMVATV)-Einzelpeptid und WT-(DFKDCERRF)-Einzelpeptid eine zytotoxische Funktion zeigten, sodass von einer kreuzreaktiven Erkennung dieser beiden Peptide in diesen drei Spendern ausgegangen werden muss. Die für diese Spender gezeigte kreuzreaktive Erkennung könnte zum GvL-Effekt bei Leukämie/Myelom-Patienten nach HSZT beitragen.
Psychosocial factors affect mental health and health-related quality of life (HRQL) in a complex manner, yet gender differences in these interactions remain poorly understood. We investigated whether psychosocial factors such as social support and personal and work-related concerns impact mental health and HRQL differentially in women and men during the first year of the COVID-19 pandemic. Between June and October 2020, the first part of a COVID-19-specific program was conducted within the “Characteristics and Course of Heart Failure Stages A-B and Determinants of Progression (STAAB)” cohort study, a representative age- and gender-stratified sample of the general population of Würzburg, Germany. Using psychometric networks, we first established the complex relations between personal social support, personal and work-related concerns, and their interactions with anxiety, depression, and HRQL. Second, we tested for gender differences by comparing expected influence, edge weight differences, and stability of the networks. The network comparison revealed a significant difference in the overall network structure. The male (N = 1370) but not the female network (N = 1520) showed a positive link between work-related concern and anxiety. In both networks, anxiety was the most central variable. These findings provide further evidence that the complex interplay of psychosocial factors with mental health and HRQL decisively depends on gender. Our results are relevant for the development of gender-specific interventions to increase resilience in times of pandemic crisis.
Sepsis ist eine dysregulierte Reaktion des Organismus auf eine Infektion. Bei Sepsis werden oft Blutungs- und Thromboseereignisse beobachtet, welche in einer Disseminierten Intravasalen Gerinnung (DIG) gipfeln können. Thrombozyten sind die Schlüsselzellen von Thrombose und Hämostase. Bei Sepsis und DIG kommt es häufig zu einem Abfall der Thrombozytenzahl, doch Blutungs- und Thromboseereignisse können unabhängig von der Thrombozytenzahl auftreten, was zusätzlich eine Veränderung der Thrombozytenfunktion nahelegt.
In dieser Arbeit wurde deshalb die Thrombozytenfunktion bei 15 Patienten mit Sepsis zu drei Zeitpunkten im Krankheitsverlauf untersucht. Es konnte bei unauffälliger Rezeptorexpression keine Voraktivierung der Thrombozyten mittels Durchflusszytometrie festgestellt werden. Jedoch war die Aktivierung nach Stimulation mit multiplen Agonisten signifikant reduziert. Besonders ausgeprägt war die Hyporeaktivität bei Stimulation des Kollagen-Rezeptors GPVI mit dem Agonisten CRP-XL. Es wurde gezeigt, dass nach GPVI-Stimulation eine reduzierte Phosphorylierung der nachgeschalteten Proteine Syk und LAT im Vergleich zum Gesundspender induziert wird. In Kreuzinkubationsexperimenten hatte die (Co )Inkubation von Thrombozyten in Plasma von Sepsispatienten oder mit Bakterienisolaten aus Sepsis-Blutkulturen keinen Effekt auf die Thrombozytenreaktivität. Allerdings konnte durch Sepsis-Vollblut eine signifikante GPVI-Hyporeaktivität in Thrombozyten von gesunden Probanden induziert werden, was einen zellulären Mediator als Ursache des Defekts nahelegt. In dieser Arbeit wurde gezeigt, dass insbesondere die GPVI-Signalkaskade bei Sepsis massiv beeinträchtigt ist. Der Immunorezeptor GPVI ist ein vielversprechendes Zielmolekül, um die Pathogenese der Sepsis, des Capillary Leak und die immunregulatorische Rolle von Thrombozyten besser zu verstehen. Die GPVI-Hyporeaktivität könnte als zukünftiger Biomarker für die Sepsis-Frühdiagnose genutzt werden.
Ziel der vorliegenden Arbeit war die erstmalige systematische Untersuchung von Vokalisationssequenzen im Längsschnitt der ersten drei Lebensmonate bei Säuglingen ohne orofaziale Spaltbildungen und nachfolgend unauffälligem Spracherwerb. Es wurden Schreisequenzen von 20 gesunden Säuglingen bezüglich einfacher Rhythmuskomponenten analysiert und verschiedene temporalen Eigenschaften untersucht. Perspektivisch dient dies einer vorsprachlichen Diagnostik, die in Zukunft nicht-invasiv prognostische Aussagen für ein Risiko von Säuglingen mit und ohne orofaziale Spaltbildungen für Sprachentwicklungsverzögerungen treffen könnte. Dies würde eine frühzeitige logopädische und sprachtherapeutische Unterstützung prädisponierter Säuglinge ermöglichen.
Es wurden 20 Säuglinge von der ersten bis zur zwölften Lebenswoche untersucht. Dabei wurden insgesamt 3,22 Stunden Säuglingsschreie interaktiv segmentiert.
Als rhythmische Komponenten wurden die Strophen, Substrophen sowie das Inter-onset Intervall (IOI) untersucht. Während für die Strophenlänge knapp keine signifikante Altersabhängigkeit nachgewiesen werden konnte, zeigten sich die Länge von Substrophen sowie IOIs als signifikant mit dem Säuglingsalter zunehmend. Dies kann als Hinweis einer sich im Altersverlauf steigernden neurophysiologischen Fähigkeit zur Produktion längerer rhythmischer Vokalisationsmuster gedeutet werden.
Signifikante geschlechtsspezifische Unterschiede konnten dabei nur auf Ebene der Strophen gefunden wurden. Die Rhythmuskomponenten Substrophe und IOI lieferten hingegen insgesamt keine Hinweise auf signifikante Entwicklungsunterschiede zwischen weiblichen und männlichen Säuglingen.
Die vorliegende Arbeit liefert damit Analyseergebnisse für rhythmische Komponenten von Säuglingsvokalisationen im Verlauf der ersten drei Lebensmonate. Diese können als Ausgangswerte für künftige Studien mit Einschluss von Säuglingen mit orofazialen Malformationen dienen und dabei helfen, diagnostisch relevante Messgrößen zur frühzeitigen Identifikation von Risikokindern zu definieren.
Der adenovirale SOX9-Gentransfer induziert nach 3-wöchiger in vitro Pelletkultur die chondrogene Differenzierung humaner mesenchymaler Stammzellen in Pelletkultur wirksamer als der TGFB1 Gentransfer mit geringerer Chondrozytenhypertrophie. Eine solche Technologie könnte zukünftig in vivo die Bildung von stabilerem hyalinem Knorpelregeneratgewebe ermöglichen.
Air pollution is associated with morbidity and mortality worldwide. We investigated the impact of improved air quality during the economic lockdown during the SARS-Cov2 pandemic on emergency room (ER) admissions in Germany. Weekly aggregated clinical data from 33 hospitals were collected in 2019 and 2020. Hourly concentrations of nitrogen and sulfur dioxide (NO2, SO2), carbon and nitrogen monoxide (CO, NO), ozone (O3) and particulate matter (PM10, PM2.5) measured by ground stations and meteorological data (ERA5) were selected from a 30 km radius around the corresponding ED. Mobility was assessed using aggregated cell phone data. A linear stepwise multiple regression model was used to predict ER admissions. The average weekly emergency numbers vary from 200 to over 1600 cases (total n = 2,216,217). The mean maximum decrease in caseload was 5 standard deviations. With the enforcement of the shutdown in March, the mobility index dropped by almost 40%. Of all air pollutants, NO2 has the strongest correlation with ER visits when averaged across all departments. Using a linear stepwise multiple regression model, 63% of the variation in ER visits is explained by the mobility index, but still 6% of the variation is explained by air quality and climate change.