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Institut
- Institut für Pharmakologie und Toxikologie (403) (entfernen)
Sonstige beteiligte Institutionen
- Institut für Biopsychologie, Universität Dresden (1)
- Johns Hopkins School of Medicine (1)
- Johns Hopkins School of Medicine, Baltimore, MD, U.S. (1)
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V. (1)
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PA sind natürliche Pflanzeninhaltsstoffe, die wegen ihres genotoxischen Potentials bekannt sind. Nach Applikation mikromolarer Konzentrationen können bei in vitro Untersuchungen von Leberzellen chromosomale Schäden detektiert werden. PA stehen im Verdacht nach Aufnahme bei Menschen hepatotoxische und kanzerogene Wirkungen nach sich zu ziehen. In dieser Studie wurden Lasiocarpin und Riddelliin an der humanen Leberkarzinomzelllinie Huh6 auf Genotoxizität getestet. Die ausgewählten Methoden waren der MK-Test, der alkalische und der FPG Comet Assay und die γ-H2AX-Färbung. In den Vorversuchen mit BaP und CPA wurde gezeigt, dass die Zellen durch Prodrugs genotoxisch geschädigt werden. Zusammenfassend kann gesagt werden, dass Riddelliin und Lasiocarpin im MK-Test eine dosisabhängige, genotoxische Wirkung auf die Huh6 Zellen haben. Der Einfluss von Lasiocarpin war im MK-Test im Vergleich zum Einfluss von Riddelliin bei geringerer Konzentration detektierbar. Nach einer simultanen Behandlung der Huh6 Zellen mit verschiedenen PA kann konkludiert werden, dass keine signifikante Erhöhung an DNA-Schäden im Vergleich zu Behandlungen mit den Einzelsubstanzen festgestellt werden konnte, was möglicherweise auf eine Erschöpfung der metabolischen Kapazität der Zellen zurückzuführen ist. Insgesamt ist es den Ergebnissen zufolge wahrscheinlich, dass die Entstehung von Crosslinks durch Lasiocarpin und Riddelliin eher eine Rolle in der Genotoxizitätsinduktion auf Huh6 Zellen spielen als oxidativer Stress. Doppelstrangbrüche konnten nicht als sicherer Induktor von Genotoxizität identifiziert werden. Die Besonderheiten der Stoffwechselwege einzelner PA und die Spezifizierung einzelner, für die Metabolisierung relevanter Enzyme sollte in Zukunft Gegenstand der Forschung sein, um die kumulativen Wirkungen von PA besser nachzuvollziehen und die für den Menschen entstehenden Risiken durch die Aufnahme von PA konkretisieren zu können.
The receptor activity-modifying proteins (RAMPs) are ubiquitously expressed membrane proteins that interact with several G protein-coupled receptors (GPCRs), the largest and pharmacologically most important family of cell surface receptors. RAMPs can regulate GPCR function in terms of ligand-binding, G-protein coupling, downstream signaling, trafficking, and recycling. The integrity of their interactions translates to many physiological functions or pathological conditions.
Regardless of numerous reports on its essential importance for cell biology and pivotal role in (patho-)physiology, the molecular mechanism of how RAMPs modulate GPCR activation remained largely elusive.
This work presents new insights that add to the common understanding of the allosteric regulation of receptor activation and will help interpret how accessory proteins - RAMPs - modulate activation dynamics and how this affects the fundamental aspects of cellular signaling. Using a prototypical class B GPCR, the parathyroid hormone 1 receptor (PTH1R) in the form of advanced genetically encoded optical biosensors, I examined RAMP's impact on the PTH1R activation and signaling in intact cells. A panel of single-cell FRET and confocal microscopy experiments as well canonical and non-canonical functional assays were performed to get a holistic picture of the signaling initiation and transduction of that clinically and therapeutically relevant GPCR. Finally, structural modeling was performed to add molecular mechanistic details to that novel art of modulation.
I describe here that RAMP2 acts as a specific allosteric modulator of PTH1R, shifting PTH1R to a unique pre-activated state that permits faster activation in a ligand-specific manner. Moreover, RAMP2 modulates PTH1R downstream signaling in an agonist-dependent manner, most notably increasing the PTH-mediated Gi3 signaling sensitivity and kinetics of cAMP accumulation. Additionally, RAMP2 increases PTH- and PTHrP-triggered β-arrestin2 recruitment to PTH1R and modulates cytosolic ERK1/2 phosphorylation. Structural homology modeling shows that structural motifs governing GPCR-RAMP interaction originate in allosteric hotspots and rationalize functional modulation. Moreover, to interpret the broader role of RAMP's modulation in GPCRs pharmacology, different fluorescent tools to investigate RAMP's spatial organization were developed, and novel conformational biosensors for class B GPCRs were engineered. Lastly, a high throughput assay is proposed and prototyped to expand the repertoire of RAMPs or other membrane protein interactors.
These data uncover the critical role of RAMPs in GPCR activation and signaling and set up a novel platform for studying GPCR modulation. Furthermore, these insights may provide a new venue for precise modulation of GPCR
function and advanced drug design.
Die ERK2Thr188-Autophosphoylierung stellt einen regulatorischen Signalweg dar, der infolge einer hypertrophen Stimulation die kardiale Hypertrophie begünstigt. Eine Hemmung dieser Phosphorylierung in Kardiomyozyten verhindert die Ausbildung der kardialen Hypertrophie ohne Beeinflussung der kardioprotektiven Funktionen von ERK1/2. Demgegenüber führt die dauerhafte Simulation zu einem gain-of-function-Phänotypen mit ausgeprägter Hypertophie, Fibrose und einer reduzierten Herzfunktion. In dieser Arbeit wurde die dauerhafte Simulation ERK2Thr188-Phosphorylierung (T188D) in einem Mausmodell mit ubiquitärer Expression dieser Mutation untersucht. Dabei konnte gezeigt werden, dass sich nach Stimulation durch TAC in diesen Tieren ein etwas stärkerer hypertropher Phänotyp mit vergrößerten Kardiomyozyten, gesteigerter interstitieller Fibrosierung und reduzierter Herzfunktion ausbildet als in Mäusen mit kardiomyozyten-spezifischer Überexpression diese Mutante. In Fibroblasten- und VSMC-Zelllinien wurde eine gesteigerte Proliferation der T188D-überexprimierenden Zellen im Vergleich zu Kontrollen festgestellt. Somit scheint die ERK2Thr188-Phosphorylierung auch in kardialen Nicht-Myozyten einen maladaptiven Einfluss auf das Herz auszuüben.
Die Pyridoxal-5‘-Phosphat Phosphatase (PDXP), auch bekannt als Chronophin (CIN), ist eine HAD-Phosphatase, die beim Menschen ubiquitär exprimiert wird und eine entscheidende Rolle im zellulären Vitamin-B6-Metabolismus einnimmt. PDXP ist in der Lage Pyridoxal-5‘-Phosphat (PLP), die co-enzymatisch aktive Form von Vitamin B6, zu dephosphorylieren. In-vivo Studien mit Mäusen zeigten, dass die Abwesenheit von PDXP mit verbesserten kognitiven Leistungen und einem verringerten Wachstum von Hirntumoren assoziiert ist. Dies begründet die gezielte Suche nach einem pharmakologischen Inhibitor für PDXP. Ein Hochdurchsatz-Screen legte nahe, dass 7,8-Dihydroxyflavon (7,8-DHF) hierfür ein potenzieller Kandidat ist. Zahlreiche Studien beschreiben bereits vielfältige positive neurologische Effekte nach in-vivo Administration von 7,8-DHF, allerdings bleibt der genaue Wirkmechanismus umstritten und wird bis dato nicht mit PDXP in Zusammenhang gebracht. Ziel dieser Arbeit ist es, die Inhibition von PDXP durch 7,8-DHF näher zu charakterisieren und damit einen Beitrag zur Beantwortung der Frage zu leisten, ob PDXP an den 7,8-DHF-induzierten Effekten beteiligt ist.
Hierzu wurde der Effekt von 7,8-DHF auf die enzymatische Aktivität von rekombinant hergestelltem, gereinigtem PDXP in in-vitro Phosphatase-Assays charakterisiert. Um die Selektivität von 7,8-DHF gegenüber PDXP zu untersuchen, wurden fünf weitere HAD-Phosphatasen getestet. Unter den analysierten Phosphatasen zeigte einzig die dem PDXP nah verwandte Phosphoglykolat Phosphatase (PGP) eine geringer ausgeprägte Sensitivität gegen 7,8-DHF. Ein Vergleich von 7,8-DHF mit sechs strukturell verwandten, hydroxylierten Flavonen zeigte, dass 7,8-DHF unter den getesteten Substanzen die höchste Potenz und Effektivität aufwies. Außerdem wurde eine Co-Kristallisation von PDXP mit 7,8-DHF durchgeführt, deren Struktur bis zu einer Auflösung von 2,0 Å verfeinert werden konnte. Die in der Kristallstruktur identifizierte Bindungsstelle von 7,8-DHF an PDXP wurde mittels verschiedener, neu generierter PDXP-Mutanten enzymkinetisch bestätigt. Zusammenfassend zeigen die hier beschriebenen Ergebnisse, dass 7,8-DHF ein direkter, selektiver und vorwiegend kompetitiver Inhibitor der PDXP-Aktivität ist, mit einer IC50 im submikromolaren Bereich.
Die Ergebnisse dieser in-vitro Untersuchungen motivieren zu weiterer Forschung bezüglich der 7,8-DHF-vermittelten Inhibition der PDXP-Aktivität in Zellen, um die Frage beantworten zu können, ob PDXP auch in-vivo ein relevantes Target für 7,8-DHF darstellt.
Changes in sugar composition occur continuously in plant tissues at different developmental stages. Tuber dormancy induction, stability, and breaking are very critical developmental transitions in yam crop production. Prolonged tuber dormancy after physiological maturity has constituted a great challenge in yam genetic improvement and productivity. In the present study, biochemical profiling of non-structural sugar in yam tubers during dormancy was performed to determine the role of non-structural sugar in yam tuber dormancy regulation. Two genotypes of the white yam species, one local genotype (Obiaoturugo) and one improved genotype (TDr1100873), were used for this study. Tubers were sampled at 42, 56, 87, 101, 115, and 143 days after physiological maturity (DAPM). Obiaoturugo exhibited a short dormant phenotype and sprouted at 101-DAPM, whereas TDr1100873 exhibited a long dormant phenotype and sprouted at 143-DAPM. Significant metabolic changes were observed in non-structural sugar parameters, dry matter, and moisture content in Obiaoturugo from 56-DAPM, whereas in TDr1100873, significant metabolic changes were observed from 101-DAPM. It was observed that the onset of these metabolic changes occurred at a point when the tubers of both genotypes exhibited a dry matter content of 60%, indicating that a dry matter content of 60% might be a critical threshold for white yam tuber sprouting. Non-reducing sugars increased by 9–10-fold during sprouting in both genotypes, which indicates their key role in tuber dormancy regulation in white yam. This result implicates that some key sugar metabolites can be targeted for dormancy manipulation of the yam crop.
Pyrrolizidine alkaloids (PAs) are secondary plant metabolites, which can be found as contaminant in various foods and herbal products. Several PAs can cause hepatotoxicity and liver cancer via damaging hepatic sinusoidal endothelial cells (HSECs) after hepatic metabolization. HSECs themselves do not express the required metabolic enzymes for activation of PAs. Here we applied a co-culture model to mimic the in vivo hepatic environment and to study PA-induced effects on not metabolically active neighbour cells. In this co-culture model, bioactivation of PA was enabled by metabolically capable human hepatoma cells HepG2, which excrete the toxic and mutagenic pyrrole metabolites. The human cervical epithelial HeLa cells tagged with H2B-GFP were utilized as non-metabolically active neighbours because they can be identified easily based on their green fluorescence in the co-culture. The PAs europine, riddelliine and lasiocarpine induced micronuclei in HepG2 cells, and in HeLa H2B-GFP cells co-cultured with HepG2 cells, but not in HeLa H2B-GFP cells cultured alone. Metabolic inhibition of cytochrome P450 enzymes with ketoconazole abrogated micronucleus formation. The efflux transporter inhibitors verapamil and benzbromarone reduced micronucleus formation in the co-culture model. Furthermore, mitotic disturbances as an additional genotoxic mechanism of action were observed in HepG2 cells and in HeLa H2B-GFP cells co-cultured with HepG2 cells, but not in HeLa H2B-GFP cells cultured alone. Overall, we were able to show that PAs were activated by HepG2 cells and the metabolites induced genomic damage in co-cultured HeLa cells.
Complement 1q/tumor necrosis factor-related proteins (CTRPs): structure, receptors and signaling
(2023)
Adiponectin and the other 15 members of the complement 1q (C1q)/tumor necrosis factor (TNF)-related protein (CTRP) family are secreted proteins composed of an N-terminal variable domain followed by a stalk region and a characteristic C-terminal trimerizing globular C1q (gC1q) domain originally identified in the subunits of the complement protein C1q. We performed a basic PubMed literature search for articles mentioning the various CTRPs or their receptors in the abstract or title. In this narrative review, we briefly summarize the biology of CTRPs and focus then on the structure, receptors and major signaling pathways of CTRPs. Analyses of CTRP knockout mice and CTRP transgenic mice gave overwhelming evidence for the relevance of the anti-inflammatory and insulin-sensitizing effects of CTRPs in autoimmune diseases, obesity, atherosclerosis and cardiac dysfunction. CTRPs form homo- and heterotypic trimers and oligomers which can have different activities. The receptors of some CTRPs are unknown and some receptors are redundantly targeted by several CTRPs. The way in which CTRPs activate their receptors to trigger downstream signaling pathways is largely unknown. CTRPs and their receptors are considered as promising therapeutic targets but their translational usage is still hampered by the limited knowledge of CTRP redundancy and CTRP signal transduction.
Mutations in the mitochondrial-DNA or mitochondria related nuclear-encoded-DNA lead to various multisystemic disorders collectively termed mitochondrial diseases. One in three cases of mitochondrial disease affects the heart muscle, which is called mitochondrial cardiomyopathy (MCM) and is associated with hypertrophic, dilated, and noncompact cardiomyopathy. The heart is an organ with high energy demand, and mitochondria occupy 30%–40% of its cardiomyocyte-cell volume. Mitochondrial dysfunction leads to energy depletion and has detrimental effects on cardiac performance. However, disease development and progression in the context of mitochondrial and nuclear DNA mutations, remains incompletely understood. The system of induced pluripotent stem cell (iPSC)-derived cardiomyocytes (CM) is an excellent platform to study MCM since the unique genetic identity to their donors enables a robust recapitulation of the predicted phenotypes in a dish on a patient-specific level. Here, we focus on recent insights into MCM studied by patient-specific iPSC-CM and further discuss research gaps and advances in metabolic maturation of iPSC-CM, which is crucial for the study of mitochondrial dysfunction and to develop novel therapeutic strategies.
In heart failure and atrial fibrillation, a persistent Na\(^+\) current (I\(_{NaL}\)) exerts detrimental effects on cellular electrophysiology and can induce arrhythmias. We have recently shown that Na\(_V\)1.8 contributes to arrhythmogenesis by inducing a I\(_{NaL}\). Genome-wide association studies indicate that mutations in the SCN10A gene (Na\(_V\)1.8) are associated with increased risk for arrhythmias, Brugada syndrome, and sudden cardiac death. However, the mediation of these Na\(_V\)1.8-related effects, whether through cardiac ganglia or cardiomyocytes, is still a subject of controversial discussion. We used CRISPR/Cas9 technology to generate homozygous atrial SCN10A-KO-iPSC-CMs. Ruptured-patch whole-cell patch-clamp was used to measure the I\(_{NaL}\) and action potential duration. Ca\(^{2+}\) measurements (Fluo 4-AM) were performed to analyze proarrhythmogenic diastolic SR Ca\(^{2+}\) leak. The I\(_{NaL}\) was significantly reduced in atrial SCN10A KO CMs as well as after specific pharmacological inhibition of Na\(_V\)1.8. No effects on atrial APD\(_{90}\) were detected in any groups. Both SCN10A KO and specific blockers of Na\(_V\)1.8 led to decreased Ca\(^{2+}\) spark frequency and a significant reduction of arrhythmogenic Ca\(^{2+}\) waves. Our experiments demonstrate that Na\(_V\)1.8 contributes to I\(_{NaL}\) formation in human atrial CMs and that Na\(_V\)1.8 inhibition modulates proarrhythmogenic triggers in human atrial CMs and therefore Na\(_V\)1.8 could be a new target for antiarrhythmic strategies.
Die C1q/tumor necrosis factor-related proteins (CTRPs) sind eine Ligandenfamilie aus sezernierten Plasmaproteinen, welche sich in ihrem Grundbauplan ähneln.
Daten aus der Literatur deuten darauf hin, dass sie zum Teil positive Effekte auf den Stoffwechsel und das Herz-Kreislaufsystem besitzen und somit eine mögliche therapeutische Zielstruktur darstellen. Während für manche CTRPs bereits Rezeptoren identifiziert werden konnten, ist für andere immer noch nicht geklärt, an welche Rezeptoren sie binden oder über welche sie diese Wirkungen erzielen. Um die CTRPs zukünftig therapeutisch nutzen zu können, muss die Wirkung der CTRPs auf verschiedene Zellen weiter analysiert werden. Dafür wurden in dieser Arbeit Zellen, auf die Expression bereits bekannter CTRP-Rezeptoren hin, untersucht. Des Weiteren wurden die durch CTRP2, CTRP3, CTRP4, CTRP9A, CTRP10, CTRP11, CTRP13 und CTRP14 induzierten Änderungen in der ATP- und Laktatproduktion als Surrogatparameter für Kardiotoxizität in den Kardiomyozytenzelllinien H9c2 und AC16 getestet, um potenziell kardiotoxische Wirkungen frühzeitig erkennen zu können. Es konnte gezeigt werden, dass die CTRPs sicher für Kardiomyozyten zu sein scheinen, was eine wichtige Grundlage für die therapeutische Nutzbarkeit darstellt.