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Author

  • Lutz, Werner K. (80)
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  • Shephard, S. E. (9)
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  • Institut für Pharmakologie und Toxikologie (363) (remove)

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363 search hits

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Proteolytic cleavage of the extracellular domain affects signaling of parathyroid hormone 1 receptor (2022)
Klenk, Christoph ; Hommers, Leif ; Lohse, Martin J.
Parathyroid hormone 1 receptor (PTH1R) is a member of the class B family of G protein-coupled receptors, which are characterized by a large extracellular domain required for ligand binding. We have previously shown that the extracellular domain of PTH1R is subject to metalloproteinase cleavage in vivo that is regulated by ligand-induced receptor trafficking and leads to impaired stability of PTH1R. In this work, we localize the cleavage site in the first loop of the extracellular domain using amino-terminal protein sequencing of purified receptor and by mutagenesis studies. We further show, that a receptor mutant not susceptible to proteolytic cleavage exhibits reduced signaling to G\(_s\) and increased activation of G\(_q\) compared to wild-type PTH1R. These findings indicate that the extracellular domain modulates PTH1R signaling specificity, and that its cleavage affects receptor signaling.
Localization and Trafficking of CXCR4 and CXCR7 (2022)
İşbilir, Ali
G protein-coupled receptors (GPCRs) constitute the largest class of membrane proteins, and are the master components that translate extracellular stimulus into intracellular signaling, which in turn modulates key physiological and pathophysiological processes. Research within the last three decades suggests that many GPCRs can form complexes with each other via mechanisms that are yet unexplored. Despite a number of functional evidence in favor of GPCR dimers and oligomers, the existence of such complexes remains controversial, as different methods suggest diverse quaternary organizations for individual receptors. Among various methods, high resolution fluorescence microscopy and imagebased fluorescence spectroscopy are state-of-the-art tools to quantify membrane protein oligomerization with high precision. This thesis work describes the use of single molecule fluorescence microscopy and implementation of two confocal microscopy based fluorescence fluctuation spectroscopy based methods for characterizing the quaternary organization of two class A GPCRs that are important clinical targets: the C-X-C type chemokine receptor 4 (CXCR4) and 7 (CXCR7), or recently named as the atypical chemokine receptor 3 (ACKR3). The first part of the results describe that CXCR4 protomers are mainly organized as monomeric entities that can form transient dimers at very low expression levels allowing single molecule resolution. The second part describes the establishment and use of spatial and temporal brightness methods that are based on fluorescence fluctuation spectroscopy. Results from this part suggests that ACKR3 forms clusters and surface localized monomers, while CXCR4 forms increasing amount of dimers as a function of receptor density in cells. Moreover, CXCR4 dimerization can be modulated by its ligands as well as receptor conformations in distinct manners. Further results suggest that antagonists of CXCR4 display distinct binding modes, and the binding mode influences the oligomerization and the basal activity of the receptor: While the ligands that bind to a “minor” subpocket suppress both dimerization and constitutive activity, ligands that bind to a distinct, “major” subpocket only act as neutral antagonists on the receptor, and do not modulate neither the quaternary organization nor the basal signaling of CXCR4. Together, these results link CXCR4 dimerization to its density and to its activity, which may represent a new strategy to target CXCR4.
Einfluss des Gewichtsverlusts auf den oxidativen Stress und den DNS-Schaden in adipösen Patient*innen nach bariatrischer Chirurgie (2022)
Soliman, Alexander
Adipositas ist eine Erkrankung, die durch ein erhöhtes Krebsrisiko neben zahlreichen anderen Komorbiditäten mit weitreichenden Folgen für die Gesundheit adipöser Patient*innen einhergeht. In der Pathogenese der adipositas-assoziierten Krebsarten sind dabei ein erhöhter oxidativer Stress sowie die damit einhergehende Schädigung der DNS maßgeblich beteiligt. Im Umkehrschluss wurde in der vorliegenden Arbeit der Einfluss eines durch bariatrische Chirurgie induzierten Gewichtsverlusts auf den oxidativen Stress und DNS-Schaden in adipösen Patient*innen anhand von Blutproben präoperativ sowie 6 und 12 Monate postoperativ untersucht. In einer Subpopulation der Patient*innen konnte eine tendenzielle Verringerung des DNS-Schadens anhand des Comet-Assays in peripheren Lymphozyten beobachtet werden. Im Hinblick auf den oxidativen Stress wurde im Plasma die Eisenreduktionsfähigkeit als Maß für die antioxidative Kapazität sowie Malondialdehyd als Surrogatmarker für das Ausmaß an Lipidperoxidation bestimmt. Weiterhin wurde in Erythrozyten das Gesamtglutathion und das oxidierte Glutathion bestimmt. Die oxidativen Stressparameter zeigten insgesamt nach einer initialen Zunahme im oxidativen Stress 6 Monate postoperativ eine rückläufige Tendenz im oxidativen Stress am Studienende. Somit geben die Beobachtungen dieser Arbeit Anlass zur Hoffnung, dass adipöse Patient*innen durch einen bariatrisch induzierten Gewichtsverlust von einer Verringerung des Krebsrisikos profitieren könnten.
The Dioscorea genus (yam) — an appraisal of nutritional and therapeutic potentials (2020)
Obidiegwu, Jude E. ; Lyons, Jessica B. ; Chilaka, Cynthia A.
The quest for a food secure and safe world has led to continuous effort toward improvements of global food and health systems. While the developed countries seem to have these systems stabilized, some parts of the world still face enormous challenges. Yam (Dioscorea species) is an orphan crop, widely distributed globally; and has contributed enormously to food security especially in sub-Saharan Africa because of its role in providing nutritional benefits and income. Additionally, yam has non-nutritional components called bioactive compounds, which offer numerous health benefits ranging from prevention to treatment of degenerative diseases. Pharmaceutical application of diosgenin and dioscorin, among other compounds isolated from yam, has shown more prospects recently. Despite the benefits embedded in yam, reports on the nutritional and therapeutic potentials of yam have been fragmented and the diversity within the genus has led to much confusion. An overview of the nutritional and health importance of yam will harness the crop to meet its potential towards combating hunger and malnutrition, while improving global health. This review makes a conscious attempt to provide an overview regarding the nutritional, bioactive compositions and therapeutic potentials of yam diversity. Insights on how to increase its utilization for a greater impact are elucidated.
Adenosine receptor ligands: coumarin−chalcone hybrids as modulating agents on the activity of hARs (2020)
Vazquez-Rodriguez, Saleta ; Vilar, Santiago ; Kachler, Sonja ; Klotz, Karl-Norbert ; Uriarte, Eugenio ; Borges, Fernanda ; Matos, Maria João
Adenosine receptors (ARs) play an important role in neurological and psychiatric disorders such as Alzheimer's disease, Parkinson's disease, epilepsy and schizophrenia. The different subtypes of ARs and the knowledge on their densities and status are important for understanding the mechanisms underlying the pathogenesis of diseases and for developing new therapeutics. Looking for new scaffolds for selective AR ligands, coumarin–chalcone hybrids were synthesized (compounds 1–8) and screened in radioligand binding (hA\(_1\), hA\(_{2A}\) and hA\(_3\)) and adenylyl cyclase (hA\(_{2B}\)) assays in order to evaluate their affinity for the four human AR subtypes (hARs). Coumarin–chalcone hybrid has been established as a new scaffold suitable for the development of potent and selective ligands for hA\(_1\) or hA\(_3\) subtypes. In general, hydroxy-substituted hybrids showed some affinity for the hA\(_1\), while the methoxy counterparts were selective for the hA\(_3\). The most potent hA\(_1\) ligand was compound 7 (K\(_i\) = 17.7 µM), whereas compound 4 was the most potent ligand for hA\(_3\) (K\(_i\) = 2.49 µM). In addition, docking studies with hA\(_1\) and hA\(_3\) homology models were established to analyze the structure–function relationships. Results showed that the different residues located on the protein binding pocket could play an important role in ligand selectivity.
PKA Cα subunit mutation triggers caspase-dependent RIIβ subunit degradation via Ser\(^{114}\) phosphorylation (2021)
Weigand, Isabel ; Ronchi, Cristina L. ; Vanselow, Jens T. ; Bathon, Kerstin ; Lenz, Kerstin ; Herterich, Sabine ; Schlosser, Andreas ; Kroiss, Matthias ; Fassnacht, Martin ; Calebiro, Davide ; Sbiera, Silviu
Mutations in the PRKACA gene are the most frequent cause of cortisol-producing adrenocortical adenomas leading to Cushing’s syndrome. PRKACA encodes for the catalytic subunit α of protein kinase A (PKA). We already showed that PRKACA mutations lead to impairment of regulatory (R) subunit binding. Furthermore, PRKACA mutations are associated with reduced RIIβ protein levels; however, the mechanisms leading to reduced RIIβ levels are presently unknown. Here, we investigate the effects of the most frequent PRKACA mutation, L206R, on regulatory subunit stability. We find that Ser\(^{114}\) phosphorylation of RIIβ is required for its degradation, mediated by caspase 16. Last, we show that the resulting reduction in RIIβ protein levels leads to increased cortisol secretion in adrenocortical cells. These findings reveal the molecular mechanisms and pathophysiological relevance of the R subunit degradation caused by PRKACA mutations, adding another dimension to the deregulation of PKA signaling caused by PRKACA mutations in adrenal Cushing’s syndrome.
Cell survival after DNA damage in the comet assay (2021)
Bankoglu, Ezgi Eyluel ; Schuele, Carolin ; Stopper, Helga
The comet assay is widely used in basic research, genotoxicity testing, and human biomonitoring. However, interpretation of the comet assay data might benefit from a better understanding of the future fate of a cell with DNA damage. DNA damage is in principle repairable, or if extensive, can lead to cell death. Here, we have correlated the maximally induced DNA damage with three test substances in TK6 cells with the survival of the cells. For this, we selected hydrogen peroxide (H\(_{2}\)O\(_{2}\)) as an oxidizing agent, methyl methanesulfonate (MMS) as an alkylating agent and etoposide as a topoisomerase II inhibitor. We measured cell viability, cell proliferation, apoptosis, and micronucleus frequency on the following day, in the same cell culture, which had been analyzed in the comet assay. After treatment, a concentration dependent increase in DNA damage and in the percentage of non-vital and apoptotic cells was found for each substance. Values greater than 20-30% DNA in tail caused the death of more than 50% of the cells, with etoposide causing slightly more cell death than H\(_{2}\)O\(_{2}\) or MMS. Despite that, cells seemed to repair of at least some DNA damage within few hours after substance removal. Overall, the reduction of DNA damage over time is due to both DNA repair and death of heavily damaged cells. We recommend that in experiments with induction of DNA damage of more than 20% DNA in tail, survival data for the cells are provided.
Effect of cryopreservation on DNA damage and DNA repair activity in human blood samples in the comet assay (2021)
Bankoglu, Ezgi Eyluel ; Stipp, Franzisca ; Gerber, Johanna ; Seyfried, Florian ; Heidland, August ; Bahner, Udo ; Stopper, Helga
The comet assay is a commonly used method to determine DNA damage and repair activity in many types of samples. In recent years, the use of the comet assay in human biomonitoring became highly attractive due to its various modified versions, which may be useful to determine individual susceptibility in blood samples. However, in human biomonitoring studies, working with large sample numbers that are acquired over an extended time period requires some additional considerations. One of the most important issues is the storage of samples and its effect on the outcome of the comet assay. Another important question is the suitability of different blood preparations. In this study, we analysed the effect of cryopreservation on DNA damage and repair activity in human blood samples. In addition, we investigated the suitability of different blood preparations. The alkaline and FPG as well as two different types of repair comet assay and an in vitro hydrogen peroxide challenge were applied. Our results confirmed that cryopreserved blood preparations are suitable for investigating DNA damage in the alkaline and FPG comet assay in whole blood, buffy coat and PBMCs. Ex vivo hydrogen peroxide challenge yielded its optimal effect in isolated PBMCs. The utilised repair comet assay with either UVC or hydrogen peroxide-induced lesions and an aphidicolin block worked well in fresh PBMCs. Cryopreserved PBMCs could not be used immediately after thawing. However, a 16-h recovery with or without mitotic stimulation enabled the application of the repair comet assay, albeit only in a surviving cell fraction.
Assessment of systemic toxicity in vitro using the Adverse Outcome Pathway (AOP) concept: nephrotoxicity due to receptor-mediated endocytosis and lysosomal overload and inhibition of mtDNA polymerase-ɣ as case studies (2022)
Jarzina, Sebastian Oskar
The US National Research Council (NRC) report "Toxicity Testing in the 21st Century: A Vision and a strategy (Tox21)", published in 2007, calls for a complete paradigm shift in tox-icity testing. A central aspect of the proposed strategy includes the transition from apical end-points in in vivo studies to more mechanistically based in vitro tests. To support and facilitate the transition and paradigm shift in toxicity testing, the Adverse Outcome Pathway (AOP) concept is widely recognized as a pragmatic tool. As case studies, the AOP concept was ap-plied in this work to develop AOPs for proximal tubule injuries initiated by Receptor-mediated endocytosis and lysosomal overload and Inhibition of mtDNA polymerase-. These AOPs were used as a mechanistic basis for the development of in vitro assays for each key event (KE). To experimentally support the developed in vitro assays, proximal tubule cells from rat (NRK-52E) and human (RPTEC/TERT1) were treated with model compounds. To measure the dis-turbance of lysosomal function in the AOP – Receptor-mediated endocytosis and lysosomal overload, polymyxin antibiotics (polymyxin B, colistin, polymyxin B nonapeptide) were used as model compounds. Altered expression of lysosomal associated membrane protein 1/2 (LAMP-1/2) (KE1) and cathepsin D release from lysosomes (KE2) were determined by im-munofluorescence, while cytotoxicity (KE3) was measured using the CellTiter-Glo® cell via-bility assay. Importantly, significant differences in polymyxin uptake and susceptibility be-tween cell lines were observed, underlining the importance of in vitro biokinetics to determine an appropriate in vitro point of departure (PoD) for risk assessment. Compared to the in vivo situation, distinct expression of relevant transporters such as megalin and cubilin on mRNA and protein level in the used cell lines (RPTEC/TERT1 and NRK-52E) could not be con-firmed, making integration of quantitative in vitro to in vivo extrapolations (QIVIVE) neces-sary. Integration of QIVIVE by project partners of the University of Utrecht showed an im-provement in the modelled biokinetic data for polymyxin B. To assess the first key event, (KE1) Depletion of mitochondrial DNA, in the AOP – Inhibition of mtDNA polymerase-, a RT-qPCR method was used to determine the mtDNA copy number in cells treated with mod-el compounds (adefovir, cidofovir, tenofovir, adefovir dipivoxil, tenofovir disoproxil fumarate). Mitochondrial toxicity (KE2) was measured by project partners using the high-content imaging technique and MitoTracker® whereas cytotoxicity (KE3) was determined by CellTiter-Glo® cell viability assay. In contrast to the mechanistic hypothesis underlying the AOP – Inhibition of mtDNA polymerase-, treatment with model compounds for 24 h resulted in an increase rather than a decrease in mtDNA copy number (KE1). Only minor effects on mitochondrial toxicity (KE2) and cytotoxicity (KE3) were observed. Treatment of RPT-EC/TERT1 cells for 14 days showed only a slight decrease in mtDNA copy number after treatment with adefovir dipivoxil and tenofovir disoproxil fumarate, underscoring some of the limitations of short-term in vitro systems. To obtain a first estimation for risk assessment based on in vitro data, potential points of departure (PoD) for each KE were calculated from the obtained in vitro data. The most common PoDs were calculated such as the effect concentra-tion at which 10 % or 20_% effect was measured (EC10, EC20), the highest no observed effect concentration (NOEC), the lowest observed effect concentration (LOEC), the benchmark 10 % (lower / upper) concentrations (BMC10, BMCL10, BMCU10) and a modelled non-toxic con-centration (NtC). These PoDs were then compared with serum and tissue concentrations de-termined from in vivo studies after treatment with therapeutic / supratherapeutic doses of the respective drugs in order to obtain a first estimate of risk based on in vitro data. In addition, AOPs were used to test whether the quantitative key event relationships between key events allow prediction of downstream effects and effects on the adverse outcome (AO) based on measurements of an early key event. Predictions of cytotoxicity from the mathematical rela-tionships showed good concordance with measured cytotoxicity after treatment with colistin and polymyxin b nonapeptide. The work also revealed uncertainties and limitations of the ap-plied strategy, which have a significant impact on the prediction and on a risk assessment based on in vitro results.
Spectroscopic approaches for the localization and dynamics of β\(_1\)- and β\(_2\)-adrenergic receptors in cardiomyocytes (2022)
Bathe-Peters, Marc
In the heart the β\(_1\)-adrenergic receptor (AR) and the β\(_2\)-AR, two prototypical G protein-coupled receptors (GPCRs), are both activated by the same hormones, namely adrenaline and noradrenaline. Both receptors couple to stimulatory G\(_s\) proteins, mediate an increase in cyclic adenosine monophosphate (cAMP) and influence the contractility and frequency of the heart upon stimulation. However, activation of the β\(_1\)-AR, not the β\(_2\)-AR, lead to other additional effects, such as changes in gene transcription resulting in cardiac hypertrophy, leading to speculations on how distinct effects can arise from receptors coupled to the same downstream signaling pathway. In this thesis the question of whether this distinct behavior may originate from a differential localization of these two receptors in adult cardiomyocytes is addressed. Therefore, fluorescence spectroscopy tools are developed and implemented in order to elucidate the presence and dynamics of these endogenous receptors at the outer plasma membrane as well as on the T-tubular network of intact adult cardiomyocytes. This allows the visualization of confined localization and diffusion of the β\(_2\)-AR to the T-tubular network at endogenous expression. In contrast, the β\(_1\)-AR is found diffusing at both the outer plasma membrane and the T-tubules. Upon overexpression of the β\(_2\)-AR in adult transgenic cardiomyocytes, the receptors experience a loss of this compartmentalization and are also found at the cell surface. These data suggest that distinct signaling and functional effects can be controlled by specific cell surface targeting of the receptor subtypes. The tools at the basis of this thesis work are a fluorescent adrenergic antagonist in combination of fluorescence fluctuation spectroscopy to monitor the localization and dynamics of the lowly expressed adrenergic receptors. Along the way to optimizing these approaches, I worked on combining widefield and confocal imaging in one setup, as well as implementing a stable autofocus mechanism using electrically tunable lenses.
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