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In line with recent OECD activities on the use of AOPs in developing Integrated Approaches to Testing and Assessment (IATAs), it is expected that systematic mapping of AOPs leading to systemic toxicity may provide a mechanistic framework for the development and implementation of mechanism-based in vitro endpoints. These may form part of an integrated testing strategy to reduce the need for repeated dose toxicity studies. Focusing on kidney and in particular the proximal tubule epithelium as a key target site of chemical-induced injury, the overall aim of this work is to contribute to building a network of AOPs leading to nephrotoxicity. Current mechanistic understanding of kidney injury initiated by 1) inhibition of mitochondrial DNA polymerase γ (mtDNA Polγ), 2) receptor mediated endocytosis and lysosomal overload, and 3) covalent protein binding, which all present fairly well established, common mechanisms by which certain chemicals or drugs may cause nephrotoxicity, is presented and systematically captured in a formal description of AOPs in line with the OECD AOP development programme and in accordance with the harmonized terminology provided by the Collaborative Adverse Outcome Pathway Wiki. The relative level of confidence in the established AOPs is assessed based on evolved Bradford-Hill weight of evidence considerations of biological plausibility, essentiality and empirical support (temporal and dose-response concordance).
The sodium channel Na\(_{v}\)1.8, encoded by SCN10A, is reported to contribute to arrhythmogenesis by inducing the late I\(_{Na}\) and thereby enhanced persistent Na\(^{+}\) current. However, its exact electrophysiological role in cardiomyocytes remains unclear. Here, we generated induced pluripotent stem cells (iPSCs) with a homozygous SCN10A knock-out from a healthy iPSC line by CRISPR Cas9 genome editing. The edited iPSCs maintained full pluripotency, genomic integrity, and spontaneous in vitro differentiation capacity. The iPSCs are able to differentiate into iPSC-cardiomyocytes, hence making it possible to investigate the role of Na\(_{v}\)1.8 in the heart.
Targeting the intrinsic metabolism of immune or tumor cells is a therapeutic strategy in autoimmunity, chronic inflammation or cancer. Metabolite repair enzymes may represent an alternative target class for selective metabolic inhibition, but pharmacological tools to test this concept are needed. Here, we demonstrate that phosphoglycolate phosphatase (PGP), a prototypical metabolite repair enzyme in glycolysis, is a pharmacologically actionable target. Using a combination of small molecule screening, protein crystallography, molecular dynamics simulations and NMR metabolomics, we discover and analyze a compound (CP1) that inhibits PGP with high selectivity and submicromolar potency. CP1 locks the phosphatase in a catalytically inactive conformation, dampens glycolytic flux, and phenocopies effects of cellular PGP-deficiency. This study provides key insights into effective and precise PGP targeting, at the same time validating an allosteric approach to control glycolysis that could advance discoveries of innovative therapeutic candidates.
Proteolytic cleavage of the extracellular domain affects signaling of parathyroid hormone 1 receptor
(2022)
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.
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.
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 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)
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.
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.
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.