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Institute
- Graduate School of Life Sciences (1017) (remove)
Sonstige beteiligte Institutionen
- Helmholtz Institute for RNA-based Infection Research (HIRI) (7)
- Universitätsklinikum Münster (3)
- Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg (2)
- Zentrum für Infektionsforschung (ZINF) Würzburg (2)
- Bio-Imaging Center Würzburg (1)
- Biomedical Center Munich, Department of Physiological Chemistry, Ludwig-Maximilians-Universität München (1)
- CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - the development agency of the Brazilian Federal Government (1)
- CBIO, University of Cape Town, South Africa (1)
- Carl-Ludwig-Institut für Physiologie, Universität Leipzig (1)
- Chair of Experimental Biomedicine I (1)
Adjuvants are compounds added to an agrochemical spray formulation to improve or modify the action of an active ingredient (AI) or the physico-chemical characteristics of the spray liquid. Adjuvants can have more than only one distinct mode of action (MoA) during the foliar spray application process and they are generally known to be the best tools to improve agrochemical formulations. The main objective for this work was to elucidate the basic MoA of adjuvants by uncoupling different aspects of the spray application. Laboratory experiments, beginning from retention and spreading characteristics, followed by humectant effects concerning the spray deposit on the leaf surface and ultimately the cuticular penetration of an AI, were figured out to evaluate overall in vivo effects of adjuvants which were also obtained in a greenhouse spray test. For this comprehensive study, the surfactant classes of non-ionic sorbitan esters (Span), polysorbates (Tween) and oleyl alcohol polyglycol ether (Genapol O) were generally considered because of their common promoting potential in agrochemical formulations and their structural diversity.
The reduction of interfacial tension is one of the most crucial physico-chemical properties of surfactants. The dynamic surface tension (DST) was monitored to characterise the surface tension lowering behaviour which is known to influence the droplet formation and retention characteristics. The DST is a function of time and the critical time frame of droplet impact might be at about 100 ms. None of the selected surfactants were found to lower the surface tension sufficiently during this short timeframe (chapter I). At ca. 100 ms, Tween 20 resulted in the lowest DST value. When surfactant monomers are fully saturated at the droplet-air-interface, an equilibrium surface tension (STeq) value can be determined which may be used to predict spreading or run-off effects. The majority of selected surfactants resulted in a narrow distribution of STeq values, ranging between 30 and 45 mN m- 1. Nevertheless, all surfactants were able to decrease the surface tension considerably compared to pure water (72 mN m- 1). The influence of different surfactants on the wetting process was evaluated by studying time-dependent static contact angles on different surfaces and the droplet spread area on Triticum aestivum leaves after water evaporation. The spreading potential was observed to be better for Spans than for Tweens. Especially Span 20 showed maximum spreading results. To transfer laboratory findings to spray application, related to field conditions, retention and leaf coverage was measured quantitatively on wheat leaves by using a variable track sprayer. Since the retention process involves short time dynamics, it is well-known that the spray retention on a plant surface is not correlated to STeq but to DST values. The relationship between DST at ca. 100 ms and results from the track sprayer showed increasing retention results with decreasing DST, whereas at DST values below ca. 60 mN m- 1 no further retention improvement could be observed.
Under field conditions, water evaporates from the droplet within a few seconds to minutes after droplet deposition on the leaf surface. Since precipitation of the AI must essentially being avoided by holding the AI in solution, so-called humectants are used as tank-mix adjuvants. The ability of pure surfactants to absorb water from the surrounding atmosphere was investigated comprehensively by analysing water sorption isotherms (chapter II). These isotherms showed an exponential shape with a steep water sorption increase starting at 60% to 70% RH. Water sorption was low for Spans and much more distinct for the polyethoxylated surfactants (Tweens and Genapol O series). The relationship between the water sorption behaviour and the molecular structure of surfactants was considered as the so-called humectant activity. With an increasing ethylene oxide (EO) content, the humectant activity increased concerning the particular class of Genapol O. However, it could be shown that the moisture absorption across all classes of selected surfactants correlates rather better with their hydrophilic-lipophilic balance values with the EO content.
All aboveground organs of plants are covered by the cuticular membrane which is therefore the first rate limiting barrier for AI uptake. In vitro penetration experiments through an astomatous model cuticle were performed to study the effects of adjuvants on the penetration of the lipophilic herbicide Pinoxaden (PXD) (chapter III). In order to understand the influence of different adjuvant MoA like humectancy, experiments were performed under three different humidity levels. No explicit relationship could be found between humidity levels and the PXD penetration which might be explained by the fact that humidity effects would rather affect hydrophilic AIs than lipophilic ones. Especially for Tween 20, it became obvious that a complex balance between multiple MoA like spreading, humectancy and plasticising effects have to be considered.
Greenhouse trials, focussing the adjuvant impact on in vivo action of PXD, were evaluated on five different grass-weed species (chapter III). Since agrochemical spray application and its following action on living plants also includes translocation processes in planta and species dependent physiological effects, this investigation may help to simulate the situation on the field. Even though the absolute weed damage was different, depending both on plant species and also on PXD rates, adjuvant effects in greenhouse experiments displayed the same ranking as in cuticular penetration studies: Tween 20 > Tween 80 > Span 20 ≥ Span 80.
Thus, the present work shows for the first time that findings obtained in laboratory experiments can be successfully transferred to spray application studies on living plants concerning adjuvant MoA. A comparative analysis, using radar charts, could demonstrate systematic derivations from structural similarities of adjuvants to their MoA (summarising discussion and outlook). Exemplarily, Tween 20 and Tween 80 cover a wide range of selected variables by having no outstanding MoA improving one distinct process during foliar application, compared to non-ethoxylated Span 20 and Span 80 which primarily revealed a surface active action. Most adjuvants used in this study represent polydisperse mixtures bearing a complex distribution of EO and aliphatic chains. From this study it seems alike that adjuvants having a wide EO distribution offer broader potential than adjuvants with a small EO distribution. It might be a speculation that due to this broad distribution of single molecules, all bearing their individual specific physico-chemical nature, a wide range of properties concerning their MoA is covered.
Kinetics and timing of IL-12 production by dendritic cells for Th1 polarization \(in\) \(vivo\)
(2020)
Dendritic cell (DC) based vaccines rely on the quality of DC maturation to induce antigen presentation, co-stimulation, lymph node migration and the release of heterodimeric IL-12p70 in case of T helper type-1 cell (Th1) polarization. In contrast, DCs that cannot secrete IL-12p70 (e.g. after cytokine cocktail maturation) readily induce Th1 cells when injected into mice and humans. Since it was also previously suggested that DCs are capable of activating other DCs in a bystander fashion, we tested here for the DC source of IL-12p70 for Th1 polarization in a murine DC vaccination model. Migration of the injected murine bone marrow-derived DCs (BM-DCs) was essential for antigen delivery to the lymph node. However, they contributed only partially to antigen presentation, and induced a non-polarized Th0 state of the cognate T cells producing IL-2 but no IFN-. Instead, endogenous dermal migratory XCR1+ cDC1s underwent re-programming by the injected BM-DCs to acquire bystander antigen presentation and IL-12 release for Th1 polarization in the lymph node. Genetic deficiency of migratory DCs and specifically of XCR1+ migratory DCs completely abolished Th1 priming. The kinetic of cell interactions in the draining lymph nodes appeared step-wise as i) injected DCs with cognate T cells, ii) injected DCs with bystander XCR1+ DCs, and iii) bystander XCR1+ DCs with T cells. The transcriptome of the bystander DCs showed a down-regulation of Treg and Th2/Th9 inducing genes, and up-regulation of genes required for Th1 instruction. Together, these data show that injected mature lymph node migratory BM-DCs direct T cell priming and bystander DC activation, but not Th1 polarization which is mediated by endogenous IL-12p70+ XCR1+ migratory bystander DCs. Our results are of importance for clinical DC-based vaccinations against tumors where endogenous DCs may be functionally impaired by chemotherapy.
Desmogleine (Dsg1-4) sind transmembranäre Adhäsionsproteine aus der Gruppe der desmosomalen Cadherine, die Zell-Zell-Kontakte zwischen benachbarten Keratinozyten der Epidermis in und außerhalb von Desmosomen vermitteln. Eine durch Autoantikörper induzierte Störung dieser Haftstrukturen (hauptsächlich Dsg1 und Dsg3) resultiert im klinischen Bild der Pemphigus-Erkrankung. Dieses ist makroskopisch durch eine Blasenbildung der Haut gekennzeichnet. Auf zellulärer und molekularbiologischer Ebene lassen sich im Falle von Pemphigus vulgaris (PV) eine Retraktion des Zytoskeletts, eine Reduzierung der Dsg3-Proteinmenge und eine Aktivierung verschiedener Signalwege u.a. der p38MAPK nachweisen. PV eignet sich daher als Modellerkrankung zur Untersuchung der Bedeutung desmosomaler Cadherine für die interzelluläre Adhäsion in Keratinozyten. Durch zahlreiche Studien wurde die wichtige Funktion von Dsg3 als Adhäsionsprotein bestätigt und eine Beteiligung an der Modulation zahlreicher Signalwege, die in Zusammenhang mit der Pemphigus-Pathogenese stehen, untersucht. Im Gegensatz dazu konnte bisher keine spezifische Funktion des desmosomalen Cadherins Dsg2 in der Epidermis identifiziert werden. Dsg2 kommt als einziges Desmoglein in allen Geweben vor, die Desmosomen enthalten, und ist auch an den Zell-Zell-Kontakten im Myokard und Darmepithel vorhanden, wo kein Dsg1 und Dsg3 exprimiert werden. Hier nimmt Dsg2 eine wichtige Rolle als Adhäsionsmolekül und als Regulator interzellulärer Prozesse ein.
In dieser Arbeit wurde daher vergleichend die Bedeutung von Dsg2 und Dsg3 für die interzelluläre Adhäsion in Keratinozyten im Hinblick auf ihre Funktion als Adhäsionsmolekül und als Rezeptormolekül, speziell im p38MAPK-Signalweg, untersucht. Wesentliche Unterschiede zeigten sich zunächst in der Lokalisation beider Proteine. Während sich die in der Literatur beschriebene Lokalisation von Dsg3 im Stratum basale und spinosum der Epidermis bestätigte, konnte Dsg2 nur am Haarfollikel nachgewiesen werden. In differenzierten HaCaT-Zellen, einer Keratinozyten-Zelllinie war Dsg2 eher punktförmig und Dsg3 nahezu linear an der Zellmembran lokalisiert. Dementsprechend ließ sich Dsg2 nach Triton-vermittelter Zellfraktionierung in ähnlicher Verteilung zwischen der Zytoskelett-gebunden und -ungebundenen Fraktion nachweisen wie Desmoplakin, das an der Zellemembran ausschließlich in Desmosomen vorkommt. Durch Dsg-spezifische Antikörper, deren inhibitorische Eigenschaft in zellfreien AFM-Studien nachgewiesen wurde, konnte nur eine Inhibierung der Dsg3- und nicht der Dsg2-vermittelten Adhäsion in HaCaT-Zellen erzielt werden. Im Gegensatz dazu induzierte derselbe Dsg2-spezifische Antikörper einen signifikanten Haftungsverlust in einer Darmepithelzelllinie. Die mittels siRNA induzierte Reduzierung der Dsg2-Proteinmenge führte jedoch nur unter erhöhter mechanischer Belastung der Zellen zu einem Adhäsionsverlust. Die simultane Modulation der Funktion von Dsg2 und Dsg3 mittels siRNA bzw. der Inkubation Dsg2-depletierter Zellen mit AK23, einem inhibitorischen Dsg3-spezifischen Antikörper, resultierte in einem drastischen, teilweise p38MAPK-abhängigen, Adhäsionsverlust. Dieser Befund lieferte erste Hinweise auf eine kompensatorische Funktion von Dsg2 bei eingeschränkter Dsg3-vermittelter Haftung in Keratinozyten. Um dies näher zu untersuchen, wurde die Verteilung von Dsg2 an der Zellemembran Dsg3-depletierter HaCaT-Zellen untersucht. Der Verlust von Dsg3 resultierte hierbei in einer Zunahme und Linearisierung der Dsg2-Membranfärbung, was die Hypothese einer kompensatorischen Funktion im Falle einer Beeinträchtigung der Dsg3-Funktion bekräftigt. Um die Funktion von Dsg2 unter dieser Bedingung gezielter zu untersuchen, wurde das transgene Dsg3-Mausmodell eingesetzt und primäre Keratinozyten aus neonatalen Dsg3-defizienten und nicht-Dsg3-defizienten Geschwistertieren isoliert. Entsprechend der vorhergehenden Befunde zeigten die Dsg3-defizienten Zellen eine deutliche Zunahme der Dsg2-Membranlokalisation sowie zusätzlich eine erhöhte DSG2-mRNA-Expression, allerdings bei unveränderten Dsg2-Proteinmengen.
Weiterhin wurde die Funktion von Dsg2 und Dsg3 als Modulator des p38MAPK-Signalweges näher untersucht. Der für Dsg3 identifizierte Komplex mit der phosphorylierten Form der p38MAPK (p-p38MAPK) konnte für Dsg2 nicht nachgewiesen werden. Ebenso führte eine Reduzierung der Dsg2-Proteinmenge, im Gegensatz zur Reduzierung der Dsg3-Proteinmenge, nicht zur Aktivierung der p38MAPK und einer Retraktion des Zytoskeletts. Der direkte Zusammenhang zwischen einem Dsg3-Funktionsverlust und der p38MAPK-Aktivität ließ sich dadurch bestätigen, dass sowohl die Keratinretraktion als auch der Haftungsverlust nach Dsg3-Depletion durch den Einsatz eines p38MAPK-spezifischen Inhibitors partiell inhibierbar waren. Auch in primären Keratinozyten mit vollständiger Dsg3-Defizienz verbesserte eine p38MAPK-Inhibierung die Zelladhäsion. Ebenso wurde in Dsg3-defizienten Zellen im Vergleich zu Zellen mit endogener Dsg3-Expression eine deutliche Lokalisation der p-p38MAPK an der Zellmembran nachgewiesen, was darauf schließen lässt, dass möglicherweise in Abwesenheit von Dsg3 andere Membranproteine an der Regulation dieses Signalweges beteiligt sind. Zusammenfassend wurde in dieser Arbeit eine bisher nicht beschriebene Funktion von Dsg2 als Kompensationspartner für Dsg3 in Keratinozyten identifiziert und die Rolle von Dsg3 als Modulator des p38MAPK-Signalweges näher charakterisiert.
Serotonin (5-HT) has been implicated in the regulation of emotions as well as in its pathological states, such as anxiety disorders and depression. Mice with targeted deletion of genes encoding various mediators of central serotonergic neurotransmission therefore provides a powerful tool in understanding contributions of such mediators to homeostatic mechanisms as well as to the development of human emotional disorders. Within this thesis a battery of electrophysiological recordings were conducted in the dorsal raphe nucleus (DRN) and the hippocampus of two murine knockout lines with deficient serotonergic systems. Serotonin transporter knockout mice (5-Htt KO), which lack protein responsible for reuptake of 5-HT from the extracellular space and tryptophan hydroxylase 2 knockout (Tph2 KO) mice, which lack the gene encoding the neuronal 5-HT-synthesising enzyme. First, 5-HT1A receptor-mediated autoinhibition of serotonergic neuron firing in the DRN was assessed using the loose-seal cell-attached configuration. Stimulation of 5-HT1A receptors by a selective agonist, R-8-hydroxy-2-(di-n-propylamino)tetralin (R-8-OH-DPAT), showed a mild sensitisation and a marked desensitisation of these receptors in Tph2 KO and 5-Htt KO mice, respectively. While application of tryptophan, a precursor of 5-HT and a substrate of Tph2, did not cause autoinhibition in Tph2 KO mice due to the lack of endogenously produced 5-HT, data from 5-Htt KO mice as well as heterozygous mice of both KO mice lines demonstrated the presence of autoinhibitory mechanisms as normal as seen in wildtype (WT) controls. When the Tph2-dependent step in the 5-HT synthesis pathway was bypassed by application of 5-hydroxytryptophan (5-HTP), serotonergic neurons of both Tph2 KO and 5-Htt KO mice showed decrease in firing rates at lower concentrations of 5-HTP than in WT controls. Elevated responsiveness of serotonergic neurons from Tph2 KO mice correspond to mild sensitisation of 5-HT1A receptors, while responses from 5-Htt KO mice suggest that excess levels of extracellular 5-HT, created by the lack of 5-Htt, stimulates 5-HT1A receptors strong enough to overcome desensitisation of these receptors. Second, the whole-cell patch clamp recording data from serotonergic neurons in the DRN showed no differences in basic electrophysiological properties between Tph2 KO and WT mice, except lower membrane resistances of neurons from KO mice. Moreover, the whole-cell patch clamp recording from CA1 pyramidal neurons in the hippocampus of 5-Htt KO mice showed increased conductance both at a steady state and at action potential generation. Lastly, magnitude of long-term potentiation (LTP) induced by the Schaffer collateral/commissural pathway stimulation in the ventral hippocampus showed no differences among Tph2 KO, 5-Htt KO, and WT counterparts. Taken together, lack and excess of extracellular 5-HT caused sensitisation and desensitisation of autoinhibitory 5-HT1A receptors, respectively. However, this may not directly translate to the level of autoinhibitory regulation of serotonergic neuron firing when these receptors are stimulated by endogenously synthesised 5-HT. In general, KO mice studied here showed an astonishing level of resilience to genetic manipulations of the central serotonergic system, maintaining overall electrophysiological properties and normal LTP inducibility. This may further suggest existence of as-yet-unknown compensatory mechanisms buffering potential alterations induced by genetic manipulations.
Kürzlich wurden bei immunvermittelten Neuropathien Autoantikörper gegen Proteine
des paranodalen axoglialen Komplexes beschrieben. Deren Charakteristika,
Prävalenzen, pathophysiologische Relevanz sowie Bedeutung für Diagnostik
und Therapie sind jedoch noch nicht abschließend erforscht.
In dieser Studie wurden daher Seren und Plasmapheresematerial (PE-Material)
von 150 Patienten mit inflammatorischen Neuropathien, nämlich 105 mit chronisch
inflammatorischer demyelinisierender Polyneuropathie (CIDP), 21 mit Guillain-
Barré-Syndrom (GBS) und 24 mit multifokaler motorischer Neuropathie
(MMN), welche etablierte diagnostische Kriterien der jeweiligen Krankheit erfüllen,
sowie 74 Kontrollen mittels immunhistochemischen Färbungen an murinen
Zupfnervenpräparaten und/oder ELISA (Enzyme-linked Immunosorbent Assay)
auf Autoantikörper gegen die paranodalen Proteine Caspr, Contactin-1 und Neurofascin-
155 untersucht. Bei positivem Ergebnis wurde deren Spezifität mittels
immunhistochemischen Färbungen an transfizierten HEK (Human embryonic kidney)-
293-Zellen und Präinkubationsversuchen bestätigt. Es wurden die IgG-Subklassen
und die Antikörpertiter bestimmt und das Komplementbindungsverhalten
unter Zugabe von intravenösen Immunglobulinen (IVIG) mit zellbasierten und
ELISA-basierten Methoden analysiert. Klinische Merkmale und das Therapieansprechen
Antikörper-positiver Patienten wurden ermittelt und mit den experimentellen
Ergebnissen in Zusammenhang gesetzt.
IgG-Autoantikörper gegen Contactin-1 konnten bei vier Patienten mit CIDP nachgewiesen
werden, IgG-Autoantikörper gegen Caspr bei einem Patienten mit
CIDP und einer Patientin mit GBS. Es konnten keine weiteren Autoantikörper bei
CIDP-Patienten, GBS-Patienten, MMN-Patienten oder bei den Kontrollen detektiert
werden. Die Prävalenz von Autoantikörpern gegen axogliale paranodale Proteine
liegt somit in dieser Studie bei jeweils 4,76% bei CIDP und GBS und 0%
bei MMN. Die Antikörper gehörten bei Patienten in der akuten Erkrankungsphase
(zwei der CIDP-Patienten mit Anti-Contactin-1-Autoantikörpern und eine GBS-Patientin mit Anti-Caspr-Autoantikörpern) hauptsächlich den Subklassen IgG1
und IgG3 an, bei Patienten in der chronischen Phase (zwei der CIDP-Patienten
mit Anti-Contactin-1-Autoantikörpern, ein CIDP-Patient mit Anti-Caspr-Autoantikörpern)
überwog die Subklasse IgG4. Experimentell kam es zur Komplementbindung
und -aktivierung abhängig vom Gehalt der Subklassen IgG1-3, nicht
aber IgG4; diese konnte durch die Zugabe von IVIG dosisabhängig gemindert
werden. Alle Autoantikörper-positiven CIDP-Patienten zeigten einen GBS-artigen
Beginn mit einer schweren motorischen Beteiligung. Anti-Contactin-1-positive
Patienten kennzeichnete klinisch zusätzlich das Vorkommen einer Ataxie und eines
Tremors, Anti-Caspr-positive Patienten das Vorkommen starker neuropathischer
Schmerzen. Elektrophysiologisch standen neben Hinweisen auf eine Leitungsstörung
Zeichen einer axonalen Schädigung im Vordergrund. Als histopathologisches
Korrelat lagen eine nodale Architekturstörung und ein Axonverlust
vor. Die Patienten zeigten nur in der Anfangsphase der Erkrankung ein Ansprechen
auf IVIG. Bei drei CIDP-Patienten mit IgG4-Autoantikörpern (zwei Patienten
mit Anti-Contactin-1-Antikörpern und ein Patient mit Anti-Caspr-Antikörpern)
wurde eine Therapie mit Rituximab durchgeführt. Diese führte zu einer Titerreduktion
und zur zeitgleichen klinischen und elektrophysiologischen Befundbesserung
bei zwei Patienten.
Die in dieser Arbeit angewandten Screeningmethoden führten zum erfolgreichen
Nachweis von Autoantikörpern gegen paranodale axogliale Proteine. Die Patienten
mit positivem Autoantikörpernachweis definieren eine kleine Untergruppe mit
ähnlichen klinischen Merkmalen im Kollektiv der Patienten mit inflammatorischen
Polyneuropathien. Histopathologische Merkmale sowie das Therapieansprechen
auf antikörperdepletierende Therapie sprechen in Kombination mit den Ergebnissen
weiterer Studien zu paranodalen Autoantikörpern für eine pathogenetische
Relevanz der Autoantikörper. Mit einem charakteristischen, am Schnürring ansetzenden
Pathomechanismus könnten Neuropathien mit Nachweis von paranodalen
Autoantikörpern der kürzlich eingeführten Entität der Nodo-Paranodopathien
angehören. Die Komplementaktivierung und das Therapieansprechen der Patienten auf IVIG stehen möglicherweise in Zusammenhang mit der prädominanten
IgG-Subklasse. Diese könnte auch in Bezug auf die Chronifizierung eine
Rolle spielen. Der Nachweis von Autoantikörpern gegen paranodale Proteine hat
wohlmöglich in Zukunft direkte Konsequenzen auf das diagnostische und therapeutische
Prozedere bei Patienten mit CIDP und GBS; weitere klinische und experimentelle
Daten aus größeren, prospektiven Studien sind jedoch zum weiteren
Verständnis und zur Charakterisierung dieser Entität notwendig.
Cyclic adenosine monophosphate (cAMP), the ubiquitous second messenger produced upon stimulation of GPCRs which couple to the stimulatory GS protein, orchestrates an array of physiological processes including cardiac function, neuronal plasticity, immune responses, cellular proliferation and apoptosis. By interacting with various effector proteins, among others protein kinase A (PKA) and exchange proteins directly activated by cAMP (Epac), it triggers signaling cascades for the cellular response. Although the functional outcomes of GSPCR-activation are very diverse depending on the extracellular stimulus, they are all mediated exclusively by this single second messenger. Thus, the question arises how specificity in such responses may be attained. A hypothesis to explain signaling specificity is that cellular signaling architecture, and thus precise operation of cAMP in space and time would appear to be essential to achieve signaling specificity. Compartments with elevated cAMP levels would allow specific signal relay from receptors to effectors within a micro- or nanometer range, setting the molecular basis for signaling specificity. Although the paradigm of signaling compartmentation gains continuous recognition and is thoroughly being investigated, the molecular composition of such compartments and how they are maintained remains to be elucidated. In addition, such compartments would require very restricted diffusion of cAMP, but all direct measurements have indicated that it can diffuse in cells almost freely.
In this work, we present the identification and characterize of a cAMP signaling compartment at a GSPCR. We created a Förster resonance energy transfer (FRET)-based receptor-sensor conjugate, allowing us to study cAMP dynamics in direct vicinity of the human glucagone-like peptide 1 receptor (hGLP1R). Additional targeting of analogous sensors to the plasma membrane and the cytosol enables assessment of cAMP dynamics in different subcellular regions. We compare both basal and stimulated cAMP levels and study cAMP crosstalk of different receptors. With the design of novel receptor nanorulers up to 60nm in length, which allow mapping cAMP levels in nanometer distance from the hGLP1R, we identify a cAMP nanodomain surrounding it. Further, we show that phosphodiesterases (PDEs), the only enzymes known to degrade cAMP, are decisive in constraining cAMP diffusion into the cytosol thereby maintaining a cAMP gradient. Following the discovery of this nanodomain, we sought to investigate whether downstream effectors such as PKA are present and active within the domain, additionally studying the role of A-kinase anchoring proteins (AKAPs) in targeting PKA to the receptor compartment. We demonstrate that GLP1-produced cAMP signals translate into local nanodomain-restricted PKA phosphorylation and determine that AKAP-tethering is essential for nanodomain PKA.
Taken together, our results provide evidence for the existence of a dynamic, receptor associated cAMP nanodomain and give prospect for which key proteins are likely to be involved in its formation. These conditions would allow cAMP to exert its function in a spatially and temporally restricted manner, setting the basis for a cell to achieve signaling specificity. Understanding the molecular mechanism of cAMP signaling would allow modulation and thus regulation of GPCR signaling, taking advantage of it for pharmacological treatment.
New experimental methods have drastically accelerated the pace and quantity at which biological data is generated. High-throughput DNA sequencing is one of the pivotal new technologies. It offers a number of novel applications in various fields of biology, including ecology, evolution, and genomics. However, together with those opportunities many new challenges arise. Specialized algorithms and software are required to cope with the amount of data, often requiring substantial training in bioinformatic methods. Another way to make those data accessible to non-bioinformaticians is the development of programs with intuitive user interfaces.
In my thesis I developed analyses and programs to tackle current problems with high-throughput data in biology. In the field of ecology this covers the establishment of the bioinformatic workflow for pollen DNA meta-barcoding. Furthermore, I developed an application that facilitates the analysis of ecological communities in the context of their traits. Information from multiple public databases have been aggregated and can now be mapped automatically to existing community tables for interactive inspection. In evolution the new data are used to reconstruct phylogenetic trees from multiple genes. I developed the tool bcgTree to automate this process for bacteria. Many plant genomes have been sequenced in current years. Sequencing reads of those projects also contain data from the chloroplasts. The tool chloroExtractor supports the targeted extraction and analysis of the chloroplast genome. To compare the structure of multiple genomes specialized software is required for calculation and visualization of the relationships. I developed AliTV to address this. In contrast to existing programs for this task it allows interactive adjustments of produced graphics. Thus, facilitating the discovery of biologically relevant information. Another application I developed helps to analyze transcriptomes even if no reference genome is present. This is achieved by aggregating the different pieces of information, like functional annotation and expression level, for each transcript in a web platform. Scientists can then search, filter, subset, and visualize the transcriptome.
Together the methods and tools expedite insights into biological systems that were not possible before.
LIM and SH3 protein 1 (LASP1) is a nucleocytoplasmic scaffolding protein. LASP1 interacts with various cytoskeletal proteins via its domain structure and is known to participate in physiological processes of cells. In the present study, a detailed investigation of the expression pattern of LASP1 protein in normal skin, melanocytic nevi and melanoma was carried out and the melanocyte–specific function of LASP1 was analyzed. LASP1 protein was identified in stratum basale of skin epidermis and a very high level was detected in nevi, the benign tumor of melanocyte. In the highly proliferative basal cells, an additional distinct nuclear localization of the protein was noted. In different tumor entities, an elevated LASP1 expression and nuclear localization, correlated positively with malignancy and tumor grade. However, LASP1 level was determined to be very low in melanoma and even reduced in metastases. Melanoma is distinguished as the first tumor tested to date – that displayed an absence of elevated LASP1 expression. In addition no significant relation was observed between LASP1 protein expression and clinicopathological parameters in melanoma.
The epidermal melanin unit of skin comprises of melanocytes and keratinocytes. Melanocytes are specialized cells that synthesize the photo protective coloring pigment, melanin inside unique organelles called melanosomes. The presence of LASP1 in melanocytes is reported for the first time through this study and the existence was confirmed by immunoblotting analysis in cultured normal human epidermal melanocyte (NHEM) and in melanoma cell lines, along with the immunohistostaining imaging in normal skin and in melanocytic nevi. LASP1 depletion in MaMel2 cells revealed a moderate increase in the intracellular melanin level independently of de novo melanogenesis, pointing to a partial hindrance in melanin release. Immunofluorescence images of NHEM and MaMel2 cells visualized co-localization of LASP1 with dynamin and tyrosinase concomitant with melanosomes at the dendrite tips of the cells. Melanosome isolation experiments by sucrose density gradient centrifugation clearly demonstrated the presence of LASP1 and the melanosome specific markers tyrosinase and TRP1 in late stage melanosomes.
The study identified LASP1 and dynamin as novel binding partners in melanocytes and provides first evidence for the existence of LASP1 and dynamin (a protein well–known for its involvement in vesicle formation and budding) in melanosomes. Co-localization of LASP1 and dynamin along the dendrites and at the tips of the melanocytes indicates a potential participation of the two proteins in the membrane vesicle fission at the plasma membrane.
In summary, a possible involvement of LASP1 in the actin–dynamin mediated membrane fission and exocytosis of melanin laden melanosome vesicles into the extracellular matrix is suggested.
While beneficial sponge-microbe associations have received much attention in recent years, less effort has been undertaken to investigate the interactions of sponges with potentially pathogenic microorganisms. Thus, the aim of this study was to examine two selected Caribbean disease conditions, termed “Sponge Orange Band” and “Sponge White Patch”, via ecological and molecular methods. Sponge Orange Band (SOB) disease affects the prominent Caribbean barrel sponge Xestospongia muta that is counted among the high-microbial-abundance (HMA) sponges, whereas Sponge White Patch (SWP) disease affects the abundant rope sponge Amphimedon compressa that belongs to the low-microbial-abundance (LMA) sponges. I have documented for both Caribbean sponge diseases a disease progression going along with massive tissue destruction as well as loss of the characteristic microbial signatures. Even though new bacteria were shown to colonize the bleached areas, the infection trials revealed in both cases no indication for the involvement of a microbial pathogen as an etiologic agent of disease leaving us still in the dark about the cause of Sponge Orange Band as well as Sponge White Patch disease.
Effects of dopamine on BDNF / TrkB mediated signaling and plasticity on cortico-striatal synapses
(2021)
Progressive loss of voluntary movement control is the central symptom of Parkinson's disease (PD). Even today, we are not yet able to cure PD. This is mainly due to a lack of understanding the mechanisms of movement control, network activity and plasticity in motor circuits, in particular between the cerebral cortex and the striatum. Brain-derived neurotrophic factor (BDNF) has emerged as one of the most important factors for the development and survival of neurons, as well as for synaptic plasticity. It is thus an important target for the development of new therapeutic strategies against neurodegenerative diseases. Together with its receptor, the Tropomyosin receptor kinase B (TrkB), it is critically involved in development and function of the striatum. Nevertheless, little is known about the localization of BDNF within presynaptic terminals in the striatum, as well as the types of neurons that produce BDNF in the cerebral cortex. Furthermore, the influence of midbrain derived dopamine on the control of BDNF / TrkB interaction in striatal medium spiny neurons (MSNs) remains elusive so far. Dopamine, however, appears to play an important role, as its absence leads to drastic changes in striatal synaptic plasticity. This suggests that dopamine could regulate synaptic activity in the striatum via modulation of BDNF / TrkB function. To answer these questions, we have developed a sensitive and reliable protocol for the immunohistochemical detection of endogenous BDNF. We find that the majority of striatal BDNF is provided by glutamatergic, cortex derived afferents and not dopaminergic inputs from the midbrain. In fact, we found BDNF in cell bodies of neurons in layers II-III and V of the primary and secondary motor cortex as well as layer V of the somatosensory cortex. These are the brain areas that send dense projections to the dorsolateral striatum for control of voluntary movement. Furthermore, we could show that these projection neurons significantly downregulate the expression of BDNF during the juvenile development of mice between 3 and 12 weeks.
In parallel, we found a modulatory effect of dopamine on the translocation of TrkB to the cell surface in postsynaptic striatal Medium Spiny Neurons (MSNs). In MSNs of the direct pathway (dMSNs), which express dopamine receptor 1 (DRD1), we observed the formation of TrkB aggregates in the 6-hydroxydopamine (6-OHDA) model of PD. This suggests that DRD1 activity controls TrkB surface expression in these neurons. In contrast, we found that DRD2 activation has opposite effects in MSNs of the indirect pathway (iMSNs). Activation of DRD2 promotes a rapid decrease in TrkB surface expression which was reversible and depended on cAMP. In parallel, stimulation of DRD2 led to induction of phospho-TrkB (pTrkB). This effect was significantly slower than the effect on TrkB surface expression and indicates that TrkB is transactivated by DRD2. Together, our data provide evidence that dopamine triggers dual modes of plasticity on striatal MSNs by acting on TrkB surface expression in DRD1 and DRD2 expressing MSNs. This surface expression of the receptor is crucial for the binding of BDNF, which is released from corticostriatal afferents. This leads to the induction of TrkB-mediated downstream signal transduction cascades and long-term potentiation (LTP). Therefore, the dopamine-mediated translocation of TrkB could be a mediator that modulates the balance between dopaminergic and glutamatergic signaling to allow synaptic plasticity in a spatiotemporal manner. This information and the fact that TrkB is segregated to persistent aggregates in PD could help to improve our understanding of voluntary movement control and to develop new therapeutic strategies beyond those focusing on dopaminergic supply.
Within this thesis, three main approaches for the assessment and investigation of altered hemodynamics like wall shear stress, oscillatory shear index and the arterial pulse wave velocity in atherosclerosis development and progression were conducted:
1. The establishment of a fast method for the simultaneous assessment of 3D WSS and PWV in the complete murine aortic arch via high-resolution 4D-flow MRI
2. The utilization of serial in vivo measurements in atherosclerotic mouse models using high-resolution 4D-flow MRI, which were divided into studies describing altered hemodynamics in late and early atherosclerosis
3. The development of tissue-engineered artery models for the controllable application and variation of hemodynamic and biologic parameters, divided in native artery models and biofabricated artery models, aiming for the investigation of the relationship between atherogenesis and hemodynamics
Chapter 2 describes the establishment of a method for the simultaneous measurement of 3D WSS and PWV in the murine aortic arch at, using ultra high-field MRI at 17.6T [16], based on the previously published method for fast, self-navigated wall shear stress measurements in the murine aortic arch using radial 4D-phase contrast MRI at 17.6 T [4]. This work is based on the collective work of Dr. Patrick Winter, who developed the method and the author of this thesis, Kristina Andelovic, who performed the experiments and statistical analyses. As the method described in this chapter is basis for the following in vivo studies and undividable into the sub-parts of the contributors without losing important information, this chapter was not split into the single parts to provide fundamental information about the measurement and analysis methods and therefore better understandability for the following studies. The main challenge in this chapter was to overcome the issue of the need for a high spatial resolution to determine the velocity gradients at the vascular wall for the WSS quantification and a high temporal resolution for the assessment of the PWV without prolonging the acquisition time due to the need for two separate measurements. Moreover, for a full coverage of the hemodynamics in the murine aortic arch, a 3D measurement is needed, which was achieved by utilization of retrospective navigation and radial trajectories, enabling a highly flexible reconstruction framework to either reconstruct images at lower spatial resolution and higher frame rates for the acquisition of the PWV or higher spatial resolution and lower frame rates for the acquisition of the 3D WSS in a reasonable measurement time of only 35 minutes. This enabled the in vivo assessment of all relevant hemodynamic parameters related to atherosclerosis development and progression in one experimental session. This method was validated in healthy wild type and atherosclerotic Apoe-/- mice, indicating no differences in robustness between pathological and healthy mice.
The heterogeneous distribution of plaque development and arterial stiffening in atherosclerosis [10, 12], however, points out the importance of local PWV measurements. Therefore, future studies should focus on the 3D acquisition of the local PWV in the murine aortic arch based on the presented method, in order to enable spatially resolved correlations of local arterial stiffness with other hemodynamic parameters and plaque composition.
In Chapter 3, the previously established methods were used for the investigation of changing aortic hemodynamics during ageing and atherosclerosis in healthy wild type and atherosclerotic Apoe-/- mice using the previously established methods [4, 16] based on high-resolution 4D-flow MRI. In this work, serial measurements of healthy and atherosclerotic mice were conducted to track all changes in hemodynamics in the complete aortic arch over time. Moreover, spatially resolved 2D projection maps of WSS and OSI of the complete aortic arch were generated. This important feature allowed for the pixel-wise statistical analysis of inter- and intragroup hemodynamic changes over time and most importantly – at a glance. The study revealed converse differences of local hemodynamic profiles in healthy WT and atherosclerotic Apoe−/− mice, with decreasing longWSS and increasing OSI, while showing constant PWV in healthy mice and increasing longWSS and decreasing OSI, while showing increased PWV in diseased mice. Moreover, spatially resolved correlations between WSS, PWV, plaque and vessel wall characteristics were enabled, giving detailed insights into coherences between hemodynamics and plaque composition. Here, the circWSS was identified as a potential marker of plaque size and composition in advanced atherosclerosis. Moreover, correlations with PWV values identified the maximum radStrain could serve as a potential marker for vascular elasticity. This study demonstrated the feasibility and utility of high-resolution 4D flow MRI to spatially resolve, visualize and analyze statistical differences in all relevant hemodynamic parameters over time and between healthy and diseased mice, which could significantly improve our understanding of plaque progression towards vulnerability. In future studies the relation of vascular elasticity and radial strain should be further investigated and validated with local PWV measurements and CFD.
Moreover, the 2D histological datasets were not reflecting the 3D properties and regional characteristics of the atherosclerotic plaques. Therefore, future studies will include 3D plaque volume and composition analysis like morphological measurements with MRI or light-sheet microscopy to further improve the analysis of the relationship between hemodynamics and atherosclerosis.
Chapter 4 aimed at the description and investigation of hemodynamics in early stages of atherosclerosis. Moreover, this study included measurements of hemodynamics at baseline levels in healthy WT and atherosclerotic mouse models. Due to the lack of hemodynamic-related studies in Ldlr-/- mice, which are the most used mouse models in atherosclerosis research together with the Apoe-/- mouse model, this model was included in this study to describe changing hemodynamics in the aortic arch at baseline levels and during early atherosclerosis development and progression for the first time. In this study, distinct differences in aortic geometries of these mouse models at baseline levels were described for the first time, which result in significantly different flow- and WSS profiles in the Ldlr-/- mouse model. Further basal characterization of different parameters revealed only characteristic differences in lipid profiles, proving that the geometry is highly influencing the local WSS in these models. Most interestingly, calculation of the atherogenic index of plasma revealed a significantly higher risk in Ldlr-/- mice with ongoing atherosclerosis development, but significantly greater plaque areas in the aortic arch of Apoe-/- mice. Due to the given basal WSS and OSI profile in these two mouse models – two parameters highly influencing plaque development and progression – there is evidence that the regional plaque development differs between these mouse models during very early atherogenesis.
Therefore, future studies should focus on the spatiotemporal evaluation of plaque development and composition in the three defined aortic regions using morphological measurements with MRI or 3D histological analyses like LSFM. Moreover, this study offers an excellent basis for future studies incorporating CFD simulations, analyzing the different measured parameter combinations (e.g., aortic geometry of the Ldlr-/- mouse with the lipid profile of the Apoe-/- mouse), simulating the resulting plaque development and composition. This could help to understand the complex interplay between altered hemodynamics, serum lipids and atherosclerosis and significantly improve our basic understanding of key factors initiating atherosclerosis development.
Chapter 5 describes the establishment of a tissue-engineered artery model, which is based on native, decellularized porcine carotid artery scaffolds, cultured in a MRI-suitable bioreactor-system [23] for the investigation of hemodynamic-related atherosclerosis development in a controllable manner, using the previously established methods for WSS and PWV assessment [4, 16]. This in vitro artery model aimed for the reduction of animal experiments, while simultaneously offering a simplified, but completely controllable physical and biological environment. For this, a very fast and gentle decellularization protocol was established in a first step, which resulted in porcine carotid artery scaffolds showing complete acellularity while maintaining the extracellular matrix composition, overall ultrastructure and mechanical strength of native arteries. Moreover, a good cellular adhesion and proliferation was achieved, which was evaluated with isolated human blood outgrowth endothelial cells. Most importantly, an MRI-suitable artery chamber was designed for the simultaneous cultivation and assessment of high-resolution 4D hemodynamics in the described artery models. Using high-resolution 4D-flow MRI, the bioreactor system was proven to be suitable to quantify the volume flow, the two components of the WSS and the radStrain as well as the PWV in artery models, with obtained values being comparable to values found in literature for in vivo measurements. Moreover, the identification of first atherosclerotic processes like intimal thickening is achievable by three-dimensional assessment of the vessel wall morphology in the in vitro models. However, one limitation is the lack of a medial smooth muscle cell layer due to the dense ECM. Here, the utilization of the laser-cutting technology for the generation of holes and / or pits on a microscale, eventually enabling seeding of the media with SMCs showed promising results in a first try and should be further investigated in future studies. Therefore, the proposed artery model possesses all relevant components for the extension to an atherosclerosis model which may pave the way towards a significant improvement of our understanding of the key mechanisms in atherogenesis.
Chapter 6 describes the development of an easy-to-prepare, low cost and fully customizable artery model based on biomaterials. Here, thermoresponsive sacrificial scaffolds, processed with the technique of MEW were used for the creation of variable, biomimetic shapes to mimic the geometric properties of the aortic arch, consisting of both, bifurcations and curvatures. After embedding the sacrificial scaffold into a gelatin-hydrogel containing SMCs, it was crosslinked with bacterial transglutaminase before dissolution and flushing of the sacrificial scaffold. The hereby generated channel was subsequently seeded with ECs, resulting in an easy-to-prepare, fast and low-cost artery model. In contrast to the native artery model, this model is therefore more variable in size and shape and offers the possibility to include smooth muscle cells from the beginning. Moreover, a custom-built and highly adaptable perfusion chamber was designed specifically for the scaffold structure, which enabled a one-step creation and simultaneously offering the possibility for dynamic cultivation of the artery models, making it an excellent basis for the development of in vitro disease test systems for e.g., flow-related atherosclerosis research. Due to time constraints, the extension to an atherosclerosis model could not be achieved within the scope of this thesis. Therefore, future studies will focus on the development and validation of an in vitro atherosclerosis model based on the proposed bi- and three-layered artery models.
In conclusion, this thesis paved the way for a fast acquisition and detailed analyses of changing hemodynamics during atherosclerosis development and progression, including spatially resolved analyses of all relevant hemodynamic parameters over time and in between different groups. Moreover, to reduce animal experiments, while gaining control over various parameters influencing atherosclerosis development, promising artery models were established, which have the potential to serve as a new platform for basic atherosclerosis research.
Tumor necrosis factor (TNF)-like weak inducer of apoptosis (TWEAK) is a member of the TNF superfamily (TNFSF) and is as such initially expressed as type II class transmembrane glycoprotein from which a soluble ligand form can be released by proteolytic processing. While the expression of TWEAK has been detected at the mRNA level in various cell lines and cell types, its cell surface expression has so far only been documented for dendritic cells, monocytes and interferon-γ stimulated NK cells. The fibroblast growth factor-inducible-14 (Fn14) is a TRAF2-interacting receptor of the TNF receptor superfamily (TNFRSF) and is the only receptor for TWEAK. The expression of Fn14 is strongly induced in a variety of non-hematopoietic cell types after tissue injury. The TWEAK/Fn14 system induces pleiotropic cellular activities such as induction of proinflammatory genes, stimulation of cellular angiogenesis, proliferation, differentiation, migration and in rare cases induction of apoptosis. On the other side, Toll-like receptor3 (TLR3) is one of DNA- and RNA-sensing pattern recognition receptors (PRRs), plays a crucial role in the first line of defense against virus and invading foreign pathogens and cancer cells. Polyinosinic-polycytidylic acid poly(I:C) is a synthetic analog of dsRNA, binds to TLR3 which acts through the adapter TRIF/TICAM1, leading to cytokine secretion, NF-B activation, IRF3 nuclear translocation, inflammatory response and may also elicit the cell death. TWEAK sensitizes cells for TNFR1-induced apoptosis and necroptosis by limiting the availability of protective TRAF2-cIAP1 and TRAF2-cIAP2 complexes, which interact with the TNFR1-binding proteins TRADD and RIPK1. In accordance with the fact that poly(I:C)-induced signaling also involves these proteins, we found enhanced necroptosis-induction in HaCaT and HeLa-RIPK3 by poly(I:C) in the presence of TWEAK (Figure 24). Analysis of a panel of TRADD, FADD, RIPK1 and caspase-8 knockout cells revealed furthermore similarities and differences in the way how these molecules act in cell death signaling by poly(I:C)/TWEAK and TNF and TRAIL. RIPK1 turned out to be essential for poly(I:C)/TWEAK-induced caspase-8-mediated apoptosis but was dispensable for these responses in TNF and TRAIL signaling. Lack of FADD protein abrogated TRAIL- but not TNF- and poly(I:C)-induced necroptosis. Moreover, we observed that both long and short FLIP rescued HaCaT and HeLa-RIPK3 cells from poly(I:C)-induced apoptosis or necroptosis.
To sum up, our results demonstrate that TWEAK, which is produced by interferon stimulated myeloid cells, controls the induction of apoptosis and necroptosis by the TLR3 ligand poly(I:C) and may thus contribute to cancer or anti-viral immunity treatment.
To grow larger, insects must shed their old rigid exoskeleton and replace it with a new one. This process is called molting and the motor behavior that sheds the old cuticle is called ecdysis. Holometabolic insects have pupal stages in between their larval and adult forms, during which they perform metamorphosis. The pupal stage ends with eclosion, i.e., the emergence of the adult from the pupal shell. Insects typically eclose at a specific time during the day, likely when abiotic conditions are at their optimum. A newly eclosed insect is fragile and needs time to harden its exoskeleton. Hence, eclosion is regulated by sophisticated developmental and circadian timing mechanisms.
In Drosophila melanogaster, eclosion is limited to a daily time window in the morning, regarded as the “eclosion gate”. In a population of laboratory flies entrained by light/dark cycles, most of the flies eclose around lights on. This rhythmic eclosion pattern is controlled by the circadian clock and persists even under constant conditions.
Developmental timing is under the control of complex hormonal signaling, including the steroid ecdysone, insulin-like peptides, and prothoracicotropic hormone (PTTH). The interactions of the central circadian clock in the brain and a peripheral clock in the prothoracic gland (PG) that produces ecdysone are important for the circadian timing of eclosion. These two clocks are connected by a bilateral pair of peptidergic PTTH neurons (PTTHn) that project to the PG. Before each molt, the ecdysone level rises and then falls shortly before ecdysis. The falling ecdysone level must fall below a certain threshold value for the eclosion gate to open. The activity of PTTHn is inhibited by short neuropeptide F (sNPF) from the small ventrolateral neurons (sLNvs) and inhibition is thought to lead to a decrease in ecdysone production.
The general aim of this thesis is to further the understanding of how the circadian clock and neuroendocrinal pathways are coordinated to drive eclosion rhythmicity and to identify when these endocrinal signaling pathways are active. In Chapter I, a series of conditional PTTHn silencing-based behavioral assays, combined with neuronal activity imaging techniques such as non-invasive ARG-Luc show that PTTH signaling is active and required shortly before eclosion and may serve to phase-adjust the activity of the PG at the end of pupal development. Trans-synaptic anatomical stainings identified the sLNvs, dorsal neurons 1 (DN1), dorsal neurons 2 (DN2), and lateral posterior neurons (LPNs) clock neurons as directly upstream of the PTTHn.
Eclosion motor behavior is initiated by Ecdysis triggering hormone (ETH) which activates a pair of ventromedial (Vm) neurons to release eclosion hormone (EH) which positively feeds back to the source of ETH, the endocrine Inka cells. In Chapter II trans-synaptic tracing showed that most clock neurons provide input to the Vm and non-canonical EH neurons. Hence, clock can potentially influence the ETH/EH feedback loop. The activity profile of the Inka cells and Vm neurons before eclosion is described. Vm and Inka cells are active around seven hours before eclosion. Interestingly, all EH neurons appear to be exclusively peptidergic.
In Chapter III, using chemoconnectomics, PTTHns were found to express receptors for sNPF, allatostatin A (AstA), allatostatin C (AstC), and myosuppressin (Ms), while EH neurons expressed only Ms and AstA receptors. Eclosion assays of flies with impaired AstA, AstC, or Ms signaling do not show arrhythmicity under constant conditions. However, optogenetic activation of the AstA neurons strongly suppresses eclosion.
Chapter IV focuses on peripheral ventral’ Tracheal dendrite (v’Td) and class IV dendritic arborization (C4da) neurons. The C4da neurons mediate larval light avoidance through endocrine PTTH signaling. The v’Td neurons mainly receive O2/CO2 input from the trachea and are upstream of Vm neurons but are not required for eclosion rhythmicity. Conditional ablation of the C4da neurons or torso (receptor of PTTH) knock-out in the C4da neurons impaired eclosion rhythmicity. Six to seven hours before eclosion, PTTHn, C4da, and Vm neurons are active based on ARG-Luc imaging. Thus, C4da neurons may indirectly connect the PTTHn to the Vm neurons.
In summary, this thesis advances our knowledge of the temporal activity and role of PTTH signaling during pupal development and rhythmic eclosion. It further provides a comprehensive characterization of the synaptic and peptidergic inputs from clock neurons to PTTHn and EH neurons. AstA, AstC, and Ms are identified as potential modulators of eclosion circuits and suggest an indirect effect of PTTH signaling on EH signaling via the peripheral sensory C4da neurons.
Malaria and HIV are among the most important global health problems of our time and together are responsible for approximately 3 million deaths annually. These two diseases overlap in many regions of the world including sub-Saharan Africa, Southeast Asia and South America, leading to a higher risk of co-infection. In this study, we generated and characterized hybrid molecules to target P. falciparum and HIV simultaneously for a potential HIV/malaria combination therapy. Hybrid molecules were synthesized by covalent fusion between azidothymidine (AZT) and dihydroartemisinin (DHA), tetraoxane or chloroquine (CQ); and a small library was generated and tested for antiviral and antimalarial activity. Our data suggest that dihyate is the most potent molecule in vitro, with antiplasmodial activity comparable to that of DHA (IC50 = 26 nM, SI > 3000), a moderate activity against HIV (IC50 = 2.9 µM; SI > 35) and safe to HeLa cells at concentrations used in the assay (CC50 > 100 µM). Pharmacokinetic studies further revealed that dihyate is metabolically unstable and is cleaved following an O-dealkylation once in contact with cytochrome P450 enzymes. The later further explains the uneffectiveness of dihyate against the CQ-sensitive P. berghei N strain in mice when administered by oral route at 20 mg/kg. Here, we report on a first approach to develop antimalarial/anti-HIV hybrid molecules and future optimization efforts will aim at producing second generation hybrid molecules to improve activity against HIV as well as compound bioavailability. With the emergence of resistant parasites against all the counterpart drugs of artemisinin derivatives used in artemisinin based combination therapies (ACTs), the introduction of antibiotics in the treatment of malaria has renewed interest on the identification of antibiotics with potent antimalarial properties. In this study we also investigated the antiplasmodial potential of thiostrepton and derivatives, synthesized using combinations of tail truncation, oxidation, and addition of lipophilic thiols to the terminal dehydroamino acid. We showed that derivatives SS231 and SS234 exhibit a better antiplasmodial activity (IC50 = 1 µM SI > 59 and SI > 77 respectively) than thiostrepton (IC50 = 8.95 µM, SI = 1.7). The antiplasmodial activity of these derivatives was observed at concentrations which are not hemolytic and non-toxic to human cell lines. Thiostrepton and derivatives appeared to exhibit transmission blocking properties when administered at their IC50 or IC90 concentrations and our data also showed that they attenuate proteasome activity of Plasmodium, which resulted in an accumulation of ubiquitinated proteins after incubation with their IC80 concentrations. Our results indicate that the parasite’s proteasome could be an attractive target for therapeutic intervention. In this regard, thiostrepton derivatives are promising candidates by dually acting on two independent targets, the proteasome and the apicoplast, with the capacity to eliminate both intraerythrocytic asexual and transmission stages of the parasite. To further support our findings, we evaluated the activity of a new class of antimalarial and proteasome inhibitors namely peptidyl sulfonyl fluorides on gametocyte maturation and analogues AJ34 and AJ38 were able to completely suppress gametocytogenesis at IC50 concentrations (0.23 µM and 0.17 µM respectively) suggesting a strong transmission blocking potential. The proteasome, a major proteolytic complex, responsible for the degradation and re-cycling of non-functional proteins has been studied only indirectly in P. falciparum. In addition, an apparent proteasome-like protein with similarity to bacterial ClpQ/hslV threonine-peptidases was predicted in the parasite. Antibodies were generated against the proteasome subunits alpha type 5 (α5-SU), beta type 5 (β5-SU) and pfhslV in mice and we showed that the proteasome is expressed in both sexual and asexual blood stages of P. falciparum, where they localize in the nucleus and in the cytoplasm. However, expression of PfhslV was only observed in trophozoites and shizonts. The trafficking of the studied proteasome subunits was further investigated by generating parasites expressing GFP tagged proteins. The expression of α5-SU-GFP in transgenic parasite appeared to localize abundantly in the cytoplasm of all blood stages, and no additional information was obtained from this parasite line. In conclusion, our data highlight two new tools towards combination therapy. Hybrid molecules represent promising tools for the cure of co-infected individuals, while very potent antibiotics with a wide scope of activities could be useful in ACTs by eliminating resistant parasites and limiting transmission of both, resistances and disease.
The interaction between circadian clocks and metabolism is of increasing interest, since clock dysfunction often correlates with metabolic pathologies. Many research articles have been published analysing the impact of factors such as circadian clock, light, feeding time and diet-type on energy homeostasis in various tissues/organs of organisms with most of the findings done in mammals. Little is known about the impact of circadian clock and the above-mentioned factors on circulating lipids, especially the transport form of lipids - diacylglycerol (DG) and membrane lipids such as phosphatidylethanolamine (PE) and phosphatidylcholine (PC) in the Drosophila hemolymph. The fruit fly Drosophila is a prime model organism in circadian, behaviour and metabolism research.
To study the role of circadian clock and behaviour in metabolism, we performed an extensive comparative hemolymph lipid (diacylglycerol: DG, phosphatidylethanolamine: PE, phosphatidylcholine: PC) analysis using ultra performance liquid chromatography coupled to time-of-flight mass spectrometry (UPLC-MS) between wild-type flies (WTCS) and clock disrupted mutants (per01). In addition, clock controlled food intake– feeding behaviour was investigated. Time-dependent variation of transport (DG) and membrane lipids (PE and PC) were not rhythmic in WTCS under constant darkness and in per01 under LD, suggesting an impact of light and clock genes on daily lipid oscillations. Day-time and night-time restriction of food led to comparable lipid profiles, suggesting that lipid oscillations are not exclusively entrained by feeding but rather are endogenously regulated. Ultradian oscillations in lipid levels in WTCS under LD were masked by digested fatty acids since lipid levels peaked more robustly at the beginning and end of light phase when flies were fed a lipid- and protein-free diet. These results suggest that metabolite (DG, PE and PC) oscillation is influenced by complex interactions between nutrient-type, photic conditions, circadian clock and feeding time.
In conclusion, the results of this thesis suggest that circadian clocks determine transport and membrane lipid oscillation in Drosophila hemolymph in complex interactions between nutrient-type, photic conditions and feeding behaviour.
Infectious diseases caused by pathogenic microorganisms are one of the largest socioeconomic burdens today. Although infectious diseases have been studied for decades, in numerous cases, the precise mechanisms involved in the multifaceted interaction between pathogen and host continue to be elusive. Thus, it still remains a challenge for researchers worldwide to develop novel strategies to investigate the molecular context of infectious diseases in order to devise preventive or at least anti-infective measures. One of the major drawbacks in trying to obtain in-depth knowledge of how bacterial pathogens elicit disease is the lack of suitable infection models to authentically mimic the disease progression in humans. Numerous studies rely on animal models to emulate the complex temporal interactions between host and pathogen occurring in humans. While they have greatly contributed to shed light on these interactions, they require high maintenance costs, are afflicted with ethical drawbacks, and are not always predictive for the infection outcome in human patients. Alternatively, in-vitro two-dimensional (2D) cell culture systems have served for decades as representatives of human host environments to study infectious diseases. These cell line-based models have been essential in uncovering virulence-determining factors of diverse pathogens as well as host defense mechanisms upon infection. However, they lack the morphological and cellular complexity of intact human tissues, limiting the insights than can be gained from studying host-pathogen interactions in these systems.
The focus of this thesis was to establish and innovate intestinal human cell culture models to obtain in-vitro reconstructed three-dimensional (3D) tissue that can faithfully mimic pathogenesis-determining processes of the zoonotic bacterium Campylobacter jejuni (C. jejuni). Generally employed for reconstructive medicine, the field of tissue engineering provides excellent tools to generate organ-specific cell culture models in vitro, realistically recapitulating the distinctive architecture of human tissues. The models employed in this thesis are based on decellularized extracellular matrix (ECM) scaffolds of porcine intestinal origin. Reseeded with intestinal human cells, application of dynamic culture conditions promoted the formation of a highly polarized mucosal epithelium maintained by functional tight and adherens junctions. While most other in-vitro infection systems are limited to a flat monolayer, the tissue models developed in this thesis can display the characteristic 3D villi and crypt structure of human small intestine.
First, experimental conditions were established for infection of a previously developed, statically cultivated intestinal tissue model with C. jejuni. This included successful isolation of bacterial colony forming units (CFUs), measurement of epithelial barrier function, as well as immunohistochemical and histological staining techniques. In this way, it became possible to follow the number of viable bacteria during the infection process as well as their translocation over the polarized epithelium of the tissue model. Upon infection with C. jejuni, disruption of tight and adherens junctions could be observed via confocal microscopy and permeability measurements of the epithelial barrier. Moreover, C. jejuni wildtype-specific colonization and barrier disruption became apparent in addition to niche-dependent bacterial localization within the 3D microarchitecture of the tissue model. Pathogenesis-related phenotypes of C. jejuni mutant strains in the 3D host environment deviated from those obtained with conventional in-vitro 2D monolayers but mimicked observations made in vivo. Furthermore, a genome-wide screen of a C. jejuni mutant library revealed significant differences for bacterial factors required or dispensable for interactions with unpolarized host cells or the highly prismatic epithelium provided by the intestinal tissue model. Elucidating the role of several previously uncharacterized factors specifically important for efficient colonization of a 3D human environment, promises to be an intriguing task for future research.
At the frontline of the defense against invading pathogens is the protective, viscoelastic mucus layer overlying mucosal surfaces along the human gastrointestinal tract (GIT). The development of a mucus-producing 3D tissue model in this thesis was a vital step towards gaining a deeper understanding of the interdependency between bacterial pathogens and host-site specific mucins. The presence of a mucus layer conferred C. jejuni wildtype-specific protection against epithelial barrier disruption by the pathogen and prevented a high bacterial burden during the course of infection. Moreover, results obtained in this thesis provide evidence in vitro that the characteristic corkscrew morphology of C. jejuni indeed grants a distinct advantage in colonizing mucous surfaces.
Overall, the results obtained within this thesis highlight the strength of the tissue models to combine crucial features of native human intestine into accessible in-vitro infection models. Translation of these systems into infection research demonstrated their ability to expose in-vivo like infection outcomes. While displaying complex organotypic architecture and highly prismatic cellular morphology, these tissue models still represent an imperfect reflection of human tissue. Future advancements towards inclusion of human primary and immune cells will strive for even more comprehensive model systems exhibiting intricate multicellular networks of in-vivo tissue. Nevertheless, the work presented in this thesis emphasizes the necessity to investigate host-pathogen interactions in infection models authentically mimicking the natural host environment, as they remain among the most vital parts in understanding and counteracting infectious diseases.
The superfamily of G protein-coupled receptors (GPCRs) comprises more than 800 members, which are divided into five families based on phylogenetic analyses (GRAFS classification): Glutamate, Rhodopsin, Adhesion, Frizzled/Taste2 and Secretin. The adhesion G protein-coupled receptor (aGPCR) family forms with 33 homologs in Mammalia the second largest and least investigated family of GPCRs. The general architecture of an aGPCR comprises the GPCR characteristics of an extracellular region (ECR), a seven transmembrane (7TM) domain and an intracellular region (ICR). A special feature of aGPCRs is the extraordinary size of the ECR through which they interact with cellular and matricellular ligands via adhesion motif folds. In addition, the ECR contains a so-called GPCR autoproteolysis-inducing (GAIN) domain, which catalyzes autoproteolytic cleavage of the protein during maturation. This cleavage leads to the formation of an N-terminal (NTF) and a C-terminal fragment (CTF), which build a unit by means of hydrophobic interactions and therefore appear as a heterodimeric receptor at the cell surface. In the past, it has been shown that the first few amino acids of the CTF act as a tethered agonist (TA) that mediates the activation of the receptor through the interaction with the 7TM domain. However, the molecular mechanism promoting the TA-7TM domain interaction remains elusive. This work reveals a novel molecular mechanism that does not require the dissociation of the NTF-CTF complex to promote release of the TA and thus activation of the aGPCR. The introduction of bioorthogonal labels into receptorsignaling- relevant regions of the TA of various aGPCRs demonstrated that the TA is freely accessible within the intact GAIN domain. This suggests a structural flexibility of the GAIN domain, which allows a receptor activation independent of the NTF-CTF dissociation, as found in cleavage-deficient aGPCR variants. Furthermore, the present study shows that the cellular localization and the conformation of the 7TM domain depends on the activity state of the aGPCR, which in turn indicates that the TA mediates conformational changes through the interaction with the 7TM domain, which ultimately regulates the receptor activity. In addition, biochemical analyses showed that the GAIN domain-mediated autoproteolysis of the human aGPCR CD97 (ADGRE5/E5) promotes further cleavage events within the receptor. This suggests that aGPCRs undergo cleavage cascades, which are initialized by the autoproteolytic reaction of the GAIN domain. Thus, it can be assumed that aGPCRs are subject to additional proteolytic events. Finally, the constitutive internalization of the NTF and the CTF of E5 was demonstrated by various labeling methods. It was possible to label both fragments independently and to follow their subcellular location in vitro. In summary, these obtained results contribute to a better understanding about the molecular mechanisms of activity and signaling of aGPCRs.
This work developed during the first funding period of the subproject B05 in the framework of the interdisciplinary research consortium TRR 225 ‘From the Fundamentals of Biofabrication toward functional Tissue Models’ and was part of a cooperation between the Orthopedic Department represented by Prof. Dr. Regina Ebert and the Institute of Organic Chemistry represented by Prof. Dr. Jürgen Seibel.
This project dealed with cellular behavior during the bioprinting process and how to influence it by modifying the cell glycocalyx with functional target molecules. The focus was on the impact of potential shear stress, that cells experience when they get processed in thermoresponsive bioinks, and a way to increase the cell stiffness via metabolic glycoengineering to attenuate shear forces. For the characterization of the metabolic glycoengineering, four different peracetylated and four non-acetylated modified monosaccharides (two mannose and two sialic acid sugars) were tested in primary human mesenchymal stromal cells (hMSC) and telomerase-immortalized hMSC (hMSC-TERT). Viability results demonstrated a dose-dependent correlation for all sugars, at which hMSC-TERT seemed to be more susceptible leading to lower viability rates. The assessment of the incorporation efficiencies was performed by click chemistry using fluorescent dyes and revealed also a dose-dependent correlation for all mannose and sialic acid sugars, while glucose and galactose variants were not detected in the glycocalyx. However, incorporation efficiencies were highest when using mannose sugars in the primary hMSC. A subsequent analysis of the temporal retention of the incorporated monosaccharides showed a constant declining fluorescence signal up to 6 d for azido mannose in hMSC-TERT, whereas no signal could be detected for alkyne mannose after 2 d. Investigation of the differentiation potential and expression of different target genes revealed no impairment after incubation with mannose sugars, indicating a normal phenotype for hMSC-TERT. Following the successful establishment of the method, either a coumarin derivative or an artificial galectin 1 ligand were incorporated into the cell glycocalyx of hMSC-TERT as functional target molecule. The biophysical analysis via shear flow deformation cytometry revealed a slightly increased cell stiffness and lowered fluidity for both molecules. A further part of this project aimed to control lectin-mediated cell adhesion by artificial galectin 1 ligands. As that hypothesis was settled in the work group of Prof. Dr. Jürgen Seibel, this work supported with an initial characterization of galectin 1 as part of the hMSC biology. A stable galectin 1 expression at gene and protein level in both hMSC and hMSC-TERT could be confirmed, at which immunocytochemical stainings could detect the protein only in the glycocalyx. The treatment of hMSC-TERT with a galectin 1 ligand in different concentrations did not show an altered gene expression of galectin 1. However, these first data in addition to the investigation of stiffness confirmed the applicability of specific and artificial
IV
galectin 1 ligands in biofabrication approaches to alter cell properties of hMSC. To conclude, metabolic glycoengineering has been successfully implemented in hMSC and hMSC-TERT to introduce glycocalyx modifications which reside there for several days. A proof of concept was carried out by the increase of cell stiffness and fluidity by the incorporation of a coumarin derivative or an artificial galectin 1 ligand.
For the characterization of shear stress impact on cells after printing in thermoresponsive bioinks, the processing of hMSC-TERT (mixing or additionally printing) with Pluronic F127 or Polyoxazoline-Polyoxazine (POx-POzi) polymer solution was investigated. While there were no changes in viability when using POx-POzi bioink, processing with Pluronic F127 indicated slightly lower viability and increased apoptosis activity. Assessment of cellular responses to potential shear stress showed no reorganization of the cytoskeleton independent of the bioink, but highly increased expression of the mechanoresponsive proto-oncogene c Fos which was more pronounced when using Pluronic F127 and just mixed with the bioinks. Interestingly, processing of the mechanoresponsive reporter cell line hMSC-TERT-AP1 revealed slightly elevated mechanotransduction activity when using POx-POzi polymer and just mixed with the bioinks as well. In conclusion, hMSC-TERT embedded in thermoresponsive bioinks might shortly experience shear stress during the printing process, but that did not lead to remarkable cell damage likely due to the rheological properties of the bioinks. Furthermore, the printing experiments also suggested that cells do not sense more shear stress when additionally printed.
In this work we wanted to investigate the role of NFATc1 in lymphocyte physiology and in pathological conditions (eg. psoriasis). NFATc1 is part of the signal transduction
pathways that regulates B cells activation and function. NFATc1 has different isoforms that are due to different promoters (P1 and P2), polyadenylation and alternative splicing. Moreover, we tried to elucidate the points of interactions between the NFAT and the NF-κB pathways in
activated B-cell fate. NFAT and NF-κB factors share several properties, such as a similar mode of induction and architecture in their DNA binding domain. We used mice which over-express a constitutive active version of NFATc1/α in their B cells with -or without- an ablated IRF4. IRF4 inhibits cell cycle progression of germinal center B cell-derived Burkitt’s lymphoma cells and
induces terminal differentiation toward plasma cells. Our experiments showed that a ‘double hit’ in factors affecting B cell activation (NFATc1 in this case) and late B cell Differentiation (IRF4 in this case) alter the development of the B cells, lead to increase in their numbers and increase in stimulation induced proliferation. Therefore, the overall picture indicates a link between these 2 genes and probable carcinogenic alterations that may occur in B cells.
We also show that in splenic B cells, c-Rel (of the NF-κB canonical pathway) Support the induction of NFATc1/αA through BCR signals. We also found evidence that the lack of NFATc1 affects the expression of Rel-B (of the NF-κB non-canonical pathway). These data suggest a tight interplay between NFATc1 and NF-κB in B cells, influencing the competence of B cells and their functions in peripheral tissues.
We also used IMQ-induced psoriasis-like inflammation on mice which either lack NFATc1 from B cell. Psoriasis is a systemic chronic immunological disease characterized
primarily by abnormal accelerated proliferation of the skin keratinocytes. In psoriasis, the precipitating event leads to immune cell activation. Our experiments showed that NFATc1 is needed for the development of psoriasis. It also showed that IL-10 is the link that enables NFAT
from altering the B cell compartment (eg Bregs) in order to affect inflammation. The important role of B cell in psoriasis is supported by the flared up psoriasis-like inflammation in mice that lack B cells. Bregs is a special type of B cells that regulate other B cells and T cells; tuning the immunological response through immunomodulatory cytokines.
Frizzled (FZD) are highly conserved receptors that belong to class F of the G protein-coupled receptor (GPCR) superfamily. They are involved in a great variety of processes during embryonic development, organogenesis, and adult tissue homeostasis. In particular, FZD5 is an important therapeutic target due to its involvement in several pathologies, such as tumorigenesis. Nevertheless, little is known regarding the activation of FZD receptors and the signal initiation, and their GPCR nature has been debated. In order to investigate the activation mechanism of these receptors, FRET (Förster Resonance Energy Transfer)-based biosensors for FZD5 have been developed and characterized. A cyan fluorescent protein (CFP) was fused to the C-terminus of the receptor and the specific FlAsH-binding sequence (CCPGCC) was inserted within the 2nd or the 3rd intracellular loop. Single-cell FRET experiments performed using one of these sensors, V5-mFZD5-FlAsH436-CFP, reported structural rearrangements in FZD5 upon stimulation with the endogenous ligand WNT-5A. These movements are similar to those observed in other GPCRs using the same technique, which suggests an activation mechanism for FZD reminiscent of GPCRs. Furthermore, stimulation of the FZD5 FRET-based sensor with various recombinant WNT proteins in a microplate FRET reader allowed to obtain concentration-response curves for several ligands, being possible to distinguish between full and partial agonists. This technology allowed to address the selectivity between WNTs and FZD5 using a full-length receptor in living cells. In addition, G protein FRET-based sensors revealed that WNT-5A specifically induced Gαq activation mediated by FZD5, but not Gαi activation. Other WNT proteins were also able to induce Gαq activation, but with lower efficacy than WNT-5A. In addition, a dual DAG/calcium sensor further showed that WNT-5A stimulation led to the activation of the Gαq-dependent signaling pathway mediated by FZD5, which outcome was the activation of Protein Kinase C (PKC) and the release of intracellular calcium. Altogether, these data provide evidence that the activation process of FZD5 resembles the general characteristics of class A and B GPCR activation, and this receptor also mediates the activation of the heterotrimeric Gαq protein and its downstream signaling pathway. In addition, the FZD5 receptor FRET-based sensor provides a valuable tool to characterize the pharmacological properties of WNTs and other potential ligands for this receptor.