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Institute
- Rudolf-Virchow-Zentrum (290) (remove)
Sonstige beteiligte Institutionen
- Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg (2)
- Center for Nanosystems Chemistry (CNC), University of Würzburg (1)
- Eberhard Karls Universität Tübingen (1)
- Genelux Corporation, San Diego Science Center, 3030 Bunker Hill Street, Suite 310, San Diego, California 92109, USA (1)
- MRB Forschungszentrum für Magnet-Resonanz-Bayern e.V., Am Hubland, D-97074 Würzburg (1)
- Research Center for Infectious Diseases, University of Wuerzburg, Wuerzburg 97080, Germany (1)
- Rudolf-Virchow-Zentrum für Experimentelle Biomedizin der Universität Würzburg (1)
Scaffold proteins are ubiquitous chaperones that promote efficient interactions between partners of multi-enzymatic protein complexes; although they are well studied in eukaryotes, their role in prokaryotic systems is poorly understood. Bacterial membranes have functional membrane microdomains (FMM), a structure homologous to eukaryotic lipid rafts. Similar to their eukaryotic counterparts, bacterial FMM harbor a scaffold protein termed flotillin that is thought to promote interactions between proteins spatially confined to the FMM. Here we used biochemical approaches to define the scaffold activity of the flotillin homolog FloA of the human pathogen Staphylococcus aureus, using assembly of interacting protein partners of the type VII secretion system (T7SS) as a case study. Staphylococcus aureus cells that lacked FloA showed reduced T7SS function, and thus reduced secretion of T7SS-related effectors, probably due to the supporting scaffold activity of flotillin. We found that the presence of flotillin mediates intermolecular interactions of T7SS proteins. We tested several small molecules that interfere with flotillin scaffold activity, which perturbed T7SS activity in vitro and in vivo. Our results suggest that flotillin assists in the assembly of S. aureus membrane components that participate in infection and influences the infective potential of this pathogen.
In most vertebrates, including zebrafish, the hypothalamic serotonergic cerebrospinal fluid-contacting (CSF-c) cells constitute a prominent population. In contrast to the hindbrain serotonergic neurons, little is known about the development and function of these cells. Here, we identify fibroblast growth factor (Fgf)3 as the main Fgf ligand controlling the ontogeny of serotonergic CSF-c cells. We show that fgf3 positively regulates the number of serotonergic CSF-c cells, as well as a subset of dopaminergic and neuroendocrine cells in the posterior hypothalamus via control of proliferation and cell survival. Further, expression of the ETS-domain transcription factor etv5b is downregulated after fgf3 impairment. Previous findings identified etv5b as critical for the proliferation of serotonergic progenitors in the hypothalamus, and therefore we now suggest that Fgf3 acts via etv5b during early development to ultimately control the number of mature serotonergic CSF-c cells. Moreover, our analysis of the developing hypothalamic transcriptome shows that the expression of fgf3 is upregulated upon fgf3 loss-of-function, suggesting activation of a self-compensatory mechanism. Together, these results highlight Fgf3 in a novel context as part of a signalling pathway of critical importance for hypothalamic development.
G-protein- coupled receptors (GPCRs) are the largest family of membrane confined receptors and they transduce ligand binding to downstream effects. Almost 40% of the drugs in the world target GPCRs due to their function, albeit knowing less about their activation. Understanding their dynamic behaviour in basal and activated state could prove key to drug development in the future. GPCRs are known to exhibit complex molecular mobility patterns. A plethora of studies have been and are being conducted to understand the mobility of GPCRs. Due to limitations of imaging and spectroscopic techniques commonly used, the relevant timescales are hard to access. The most commonly used techniques are electron paramagnetic resonance or double electronelectron resonance, nuclear magnetic resonance, time-resolved fluorescence, single particle tracking and fluorescence recovery after photobleaching. Among these techniques only fluorescence has the potential to probe live cells. In this thesis, I use different time-resolved fluorescence spectroscopic techniques to quantify diffusion dynamics / molecular mobility of β2-adrenergic receptor (β2-AR) in live cells. The thesis shows that β2-AR exhibits mobility over an exceptionally broad temporal range (nanosecond to second) that can be linked to its respective physiological scenario. I explain how β2-AR possesses surprisingly fast lateral mobility (~10 μm²/s) associated with vesicular transport in contrast to the prior reports of it originating from fluorophore photophysics and free fluorophores in the cytosol. In addition, β2-AR has rotational mobility (~100 μs) that makes it conform to the Saffman-Delbrück model of membrane diffusion unlike earlier studies. These contrasts are due to the limitations of the methodologies used. The limitations are overcome in this thesis by using different time-resolved fluorescence techniques of fluorescence correlation spectroscopy (FCS), time-resolved anisotropy (TRA) and polarisation resolved fullFCS (fullFCS). FCS is limited to microsecond to the second range and TRA is limited to the nanosecond range. fullFCS complements the two techniques by covering the blind spot of FCS and TRA in the microsecond range. Finally, I show how ligand stimulation causes a decrease in lateral mobility which could be a hint at cluster formation due to internalisation and how β2-AR possesses a basal oligomerisation that does not change on activation. Thus, through this thesis, I show how different complementary fluorescence techniques are necessary to overcome limitations of each technique and to thereby elucidate functional dynamics of GPCR activation and how it orchestrates downstream signalling.
FANCM is a highly conserved DNA remodeling enzyme that promotes the activation of the Fanconi anemia DNA repair pathway and facilitates replication traverse of DNA interstrand crosslinks. However, how FANCM interacts with the replication machinery to promote traverse remains unclear. Here, we show that FANCM and its archaeal homolog Hef from Thermoplasma acidophilum interact with proliferating cell nuclear antigen (PCNA), an essential co-factor for DNA polymerases in both replication and repair. The interaction is mediated through a conserved PIP-box; and in human FANCM, it is strongly stimulated by replication stress. A FANCM variant carrying a mutation in the PIP-box is defective in promoting replication traverse of interstrand crosslinks and is also inefficient in promoting FANCD2 monoubiquitination, a key step of the Fanconi anemia pathway. Our data reveal a conserved interaction mode between FANCM and PCNA during replication stress, and suggest that this interaction is essential for FANCM to aid replication machines to traverse DNA interstrand crosslinks prior to post-replication repair.
Background
Streptococcus pneumoniae causes serious diseases such as pneumonia and meningitis. Its major pathogenic factor is the cholesterol-dependent cytolysin pneumolysin, which produces lytic pores at high concentrations. At low concentrations, it has other effects, including induction of apoptosis. Many cellular effects of pneumolysin appear to be calcium dependent.
Methods
Live imaging of primary mouse astroglia exposed to sublytic amounts of pneumolysin at various concentrations of extracellular calcium was used to measure changes in cellular permeability (as judged by lactate dehydrogenase release and propidium iodide chromatin staining). Individual pore properties were analyzed by conductance across artificial lipid bilayer. Tissue toxicity was studied in continuously oxygenated acute brain slices.
Results
The reduction of extracellular calcium increased the lytic capacity of the toxin due to increased membrane binding. Reduction of calcium did not influence the conductance properties of individual toxin pores. In acute cortical brain slices, the reduction of extracellular calcium from 2 to 1 mM conferred lytic activity to pathophysiologically relevant nonlytic concentrations of pneumolysin.
Conclusions
Reduction of extracellular calcium strongly enhanced the lytic capacity of pneumolysin due to increased membrane binding. Thus, extracellular calcium concentration should be considered as a factor of primary importance for the course of pneumococcal meningitis. "
Platelets play an important role in the body, since they are part of the hemostasis
system, preventing and stopping blood loss. Nevertheless, when platelet or
coagulation system function are impaired, uncontrolled bleedings but also irreversible
vessel occlusion followed by ischemic tissue damage can occur. Therefore,
understanding platelet function and activation, mechanisms which are controlled by a
variety of platelet membrane receptors and other factors is important to advance out
knowledge of hemostasis and platelet malfunction. For a complete picture of platelet
function and their modulating behavior it is desired to be able to quantify receptor
distributions and interactions of these densely packed molecular ensembles in the
membrane. This challenges scientists for several reasons. Most importantly, platelets
are microscopically small objects, challenging the spatial resolution of conventional
light microscopy. Moreover, platelet receptors are highly abundant on the membrane
so even super-resolution microscopy struggles with quantitative receptor imaging on
platelets.
With Expansion microscopy (ExM), a new super-resolution technique was introduced,
allowing resolutions to achieve super-resolution without using a super-resolution
microscope, but by combining a conventional confocal microscopy with a highly
processed sample that has been expanded physically. In this doctoral thesis, I
evaluated the potential of this technique for super-resolution platelet imaging by
optimizing the sample preparation process and establishing an imaging and image
processing pipeline for dual-color 3D images of different membrane receptors. The
analysis of receptor colocalization using ExM demonstrated a clear superiority
compared to conventional microscopy. Furthermore, I identified a library of
fluorescently labeled antibodies against different platelet receptors compatible with
ExM and showed the possibility of staining membrane receptors and parts of the
cytoskeleton at the same time.
Ischemic disorders are the leading cause of death worldwide. The extracellular signal-regulated kinases 1 and 2 (ERK1/2) are thought to affect the outcome of ischemic stroke. However, it is under debate whether activation or inhibition of ERK1/2 is beneficial. In this study, we report that the ubiquitous overexpression of wild-type ERK2 in mice (ERK2\(^{wt}\)) is detrimental after transient occlusion of the middle cerebral artery (tMCAO), as it led to a massive increase in infarct volume and neurological deficits by increasing blood–brain barrier (BBB) leakiness, inflammation, and the number of apoptotic neurons. To compare ERK1/2 activation and inhibition side-by-side, we also used mice with ubiquitous overexpression of the Raf-kinase inhibitor protein (RKIP\(^{wt}\)) and its phosphorylation-deficient mutant RKIP\(^{S153A}\), known inhibitors of the ERK1/2 signaling cascade. RKIP\(^{wt}\) and RKIP\(^{S153A}\) attenuated ischemia-induced damages, in particular via anti-inflammatory signaling. Taken together, our data suggest that stimulation of the Raf/MEK/ERK1/2-cascade is severely detrimental and its inhibition is rather protective. Thus, a tight control of the ERK1/2 signaling is essential for the outcome in response to ischemic stroke.
Bei der Teilung einer Zelle werden das Genom und die Zellbestandteile zwischen zwei Tochterzellen aufgeteilt. Dies erfordert verschiedene fein aufeinander abgestimmte Vorgänge. Unter anderem ist eine proteinreiche Struktur beteiligt, die 1891 entdeckt wurde: der Mittelkörper. In vorliegender Arbeit wurden gezielt gekennzeichnete Mittelkörperproteine analysiert und verschiedene Phasen des Transports unterschieden. Es erfolgten erstmals Messungen unter Nutzung der ZF1-Methode. Zudem wird anhand der ZF1-Technik nachgewiesen, dass im Rahmen der Zellteilung die Trennung der interzellulären Brücke zu beiden Seiten des Mittelkörpers stattfindet, woraufhin dieser nach extrazellulär abgegeben wird und über einen der Phagozytose ähnlichen und von Aktin abhängigen Mechanismus von einer Tochterzelle oder unverwandten Nachbarzelle aufgenommen wird.
Epithelial magnesium transport by TRPM6 is essential for prenatal development and adult survival
(2016)
Mg2+ regulates many physiological processes and signalling pathways. However, little is known about the mechanisms underlying the organismal balance of Mg2+. Capitalizing on a set of newly generated mouse models, we provide an integrated mechanistic model of the regulation of organismal Mg2+ balance during prenatal development and in adult mice by the ion channel TRPM6. We show that TRPM6 activity in the placenta and yolk sac is essential for embryonic development. In adult mice, TRPM6 is required in the intestine to maintain organismal Mg2+ balance, but is dispensable in the kidney. Trpm6 inactivation in adult mice leads to a shortened lifespan, growth deficit and metabolic alterations indicative of impaired energy balance. Dietary Mg2+ supplementation not only rescues all phenotypes displayed by Trpm6-deficient adult mice, but also may extend the lifespan of wildtype mice. Hence, maintenance of organismal Mg2+ balance by TRPM6 is crucial for prenatal development and survival to adulthood.
Background: All three nitric oxide synthase (NOS) isoforms are expressed in atherosclerotic plaques. NOS enzymes in general catalyse NO production. However, under conditions of substrate and cofactor deficiency, the enzyme directly catalyse superoxide formation. Considering this alternative chemistry, the effects of NOS on key events in spontaneous hyperlipidemia driven atherosclerosis have not been investigated yet. Here, we evaluate how endothelial nitric oxide synthase (eNOS) modulates leukocyte/endothelial-(L/E) and platelet/endothelial-(P/E) interactions in atherosclerosis and the production of nitric oxide (NO) and superoxide by the enzyme.
Principal Findings: Intravital microscopy (IVM) of carotid arteries revealed significantly increased L/E-interactions in apolipoproteinE/eNOS double knockout mice (apoE\(^{-/-}\)/eNOS\(^{-/-}\)), while P/E-interactions did not differ, compared to apoE\(^{-/-}\). eNOS deficiency increased macrophage infiltration in carotid arteries and vascular cell adhesion molecule-1 (VCAM-1) expression, both in endothelial and smooth muscle cells. Despite the expression of other NOS isoforms (inducible NOS, iNOS and neuronal NOS, nNOS) in plaques, Electron Spin Resonance (ESR) measurements of NO showed significant contribution of eNOS to total circulating and vascular wall NO production. Pharmacological inhibition and genetic deletion of eNOS reduced vascular superoxide production, indicating uncoupling of the enzyme in apoE\(^{-/-}\) vessels.
Conclusion: Overt plaque formation, increased vascular inflammation and L/E-interactions are associated with significant reduction of superoxide production in apoE\(^{-/-}\)/eNOS\(^{-/-}\) vessels. Therefore, lack of eNOS does not cause an automatic increase in oxidative stress. Uncoupling of eNOS occurs in apoE\(^{-/-}\) atherosclerosis but does not negate the enzyme's strong protective effects.