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Institute
- Institut für Pharmakologie und Toxikologie (407) (remove)
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Phosphatasen der HAD (haloacid dehalogenase)-Familie sind weit verbreitet in allen Domänen des Lebens und erfüllen die verschiedensten zellulären Aufgaben, beispielsweise in Metabolismus und Zellregulation. Die HAD-Phosphatase Chronophin zeigt Phosphataseaktivität unter anderem gegenüber Pyridoxal-5‘-Phosphat (PLP), einem essentiellen Kofaktor vieler biochemischer Prozesse, und Phosphocofilin, einem Regulator des Aktinzytoskeletts. Chronophin dimerisiert über die Interaktion zweier identischer Untereinheiten zu einem Homodimer. Ziel dieser Arbeit war, die Rolle dieser Dimerisierung, eines bei HAD-Phosphatasen weit verbreiteten Oligomerisierungszustandes, näher zu untersuchen.
Hierzu wurde die Dimerisierung erfolgreich durch den Austausch der Aminosäuren Alanin 194 und 195 zu Lysinen (Mutation A194K/A195K) gestört. Der Nachweis einer konstitutiv monomeren Chronophin-Mutante mittels Größenausschlusschromatographie, Rasterkraftmikroskopie, analytischer Ultra¬zentrifugation und Zellexperimenten wurde schließlich über die Struktur¬auflösung mittels Röntgenstrukturanalyse bestätigt. Aktivitätsmessungen der monomeren Mutante gegenüber dem Substrat PLP zeigten eine deutliche Verminderung der Phosphataseaktivität. Die Röntgenstrukturanalyse von Chronophin A194K/A195K im Vergleich mit Wildtyp-Chronophin enthüllte einen Mechanismus, wie die sogenannte Substratspezifitätsschleife, die für die korrekte Positionierung des PLP sorgt, im Homodimer des Wildtyps durch Interaktionen mit dem zweiten Protomer stabilisiert wird. Diese Stabilisierung fehlt bei der monomeren Mutante und äußert sich in einer veränderten Stellung der Substratspezifitätsschliefe. Der Strukturvergleich von Chronophin mit weiteren HAD-Phosphatasen der selben strukturellen Untergruppe vom C2a-Typ lässt eine allgemeine Gültigkeit der hier beschriebenen allosterischen Kontrolle von Substratspezifität über Homodimerisierung bei HAD-Phosphatasen vermuten und könnte so neue Ansatzpunkte für möglicherweise auch therapeutisch nutzbare Aktivitätshemmungen liefern.
In den letzten Jahrzehnten ist die Akzeptanz stetig größer geworden, dass oxidativer Stress eine bedeutende Rolle bei der Entstehung von chronischen Erkrankungen, malignen Neoplasien sowie der Beschleunigung des Alterungsprozesses spielt. Als eine der häufigsten chronischen Erkrankungen ist Hypertonie oft mit einem fehlregulierten Renin-Angiotensin-Aldosteron-System assoziiert, welches chronisch oxidativen Stress verursacht. Bluthochdruck ist ein Risikofaktor für neurologische Erkrankungen wie der vaskulären Demenz (VaD) und viele neurologischen Störungen, einschließlich der VaD, haben eine ROS-assoziierte beziehungsweise inflammatorische Komponente in ihrer Entstehung.
Unsere Arbeitsgruppe konnte bereits eine AT-II-induzierte Genotoxizität in Nieren- und Myokardzellen bzw. -Gewebe nachweisen. Ziel dieser Dissertation war es, einen möglichen Zusammenhang zwischen AT-II und Neurodegeneration zu untersuchen, welche durch eine neuronale Genotoxizität von AT-II ausgelöst wird.
Zunächst zeigten wir in zwei neuronalen Zelllinien, dass AT-II eine Dosis-abhängige Genomschädigung verursacht. Nachfolgende Experimente konnten diese Toxizität auf NOX-produziertes Superoxid zurückführen, das nach Bindung von AT-II an den AT1R generiert wird. Zudem konnte ein AT-II-induzierter Verbrauch des wichtigsten intrazellulären Antioxidans – Glutathion - nachgewiesen werden.
In vivo konnten wir zeigen, dass AT1aR-Knockout-Mäuse nach AT-II-Behandlung signifikant mehr Genomschäden im Subfornikalorgan (SFO) aufwiesen als Wildtypmäuse. Das SFO hat als eine der wenigen Strukturen im Gehirn eine unterbrochene Blut-Hirn-Schranke, was es für zirkulierendes AT-II zugänglich und besonders empfindlich macht. Diese Genomschäden wurden in der neueren Literatur auch in Nieren- und Herzgewebe beschrieben und belegen eine zusätzliche, AT1aR- und damit Blutdruck-unabhängige Genotoxizität von AT-II.
Zusammenfassend zeigt diese Arbeit, dass erhöhte AT-II-Konzentrationen in Nervenzellen Genomschäden durch NOX-produziertes Superoxid verursachen. Die Hoffnung ist, dass diese Ergebnisse dabei helfen, eines Tages die vollständige Entstehung der VaD zu entschlüsseln.
Some chromosomes in transformed rat cells and somatic cell hybrids fail to display the presence of kinetochore proteins as detected by antikinetochore antibodies. Suchchromosomes (K- Chromosomes) may constitute a novel mechanism for the genesis of aneuploidy. Wehave analyzed primary~ immortalized and malignant marnmalian cells for the presence of kinetochore proteins and micronuclei. Our resuJts suggest a correlation of the K- chromosome and micronucleus frequency with the variability in chromosome number. Upon in situ hybridization with the minor satellite and alpha satellite sequences some Kchromosomes showed a signal. This indicates that the observed lack of kinetocbores is not necessarily due to a lack of centromeric DNA. We conclude that dislocated K- chromosomes may become incorporated into micronuclei which are prone to loss. Such events would be associated with the generation of aneuploidy.
Decamethylcyclopentasiloxane (D5) is a cyclic siloxane used in the production and formulation of consumer products with potential exposure to manufacturing workers, consumer, and the general public. Following a combined 2-year inhalation chronic bioassay performed in Fischer 344 (F344) rats, an increase in uterine endometrial adenocarcinomas was noted at the highest concentration to which animals were exposed. No other neoplasms were detected. In this study, a dose of 160 ppm produced an incidence of 8% endometrial adenocarcinomas. Based on a number of experimental studies with D5, the current manuscript examines the biological relevance and possible modes of action for the uterine endometrial adenocarcinomas observed in the rat following chronic exposure to D5. Variable rates of spontaneous uterine endometrial adenocarcinomas have been reported for untreated F344 CrIBr rats. As such, we concluded that the slight increase in uterine endometrial adenocarcinomas observed in the D5 chronic bioassay might not be the result of D5 exposure but may be related to variability of the spontaneous tumor incidence in this strain of rat. However, if the uterine endometrial adenocarcinomas are related to D5-exposure, alteration in the estrous cycle in the aging F344 rat is the most likely mode of action. D5 is not genotoxic or estrogenic. The alteration in the estrous cycle is caused by a decrease in progesterone with an increase in the estrogen:progesterone ratio most likely induced by a decrease in prolactin concentration. Available data support that exposure to D5 influences prolactin concentration. Although the effects on prolactin concentrations in a number of experiments were not always consistent, the available data support the conclusion that D5 is acting via a dopamine receptor agonist-like mechanism to alter the pituitary control of the estrous cycle. In further support of this mode of action, studies in F344 aged animals showed that the effects of D5 on estrous cyclicity produced a response consistent with a dopamine-like effect and further suggest that D5 is accelerating the aging of the reproductive endocrine system in the F344 rat utilized in this study. This mode of action for uterine endometrial adenocarcinoma tumorigenesis is not relevant for humans.
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.
Der Parathormonrezeptor Typ 1 (PTHR) ist ein G-Protein-gekoppelter Rezeptor der Gruppe 2 und wichtigster Regulator des Kalziumstoffwechsels. Im ersten Teil der Arbeit wurde eine neuartige posttranslationale Modifikation des PTHR in Form einer proteolytischen Spaltung der Ektodomäne identifiziert, charakterisiert und deren Regulation beschrieben. Nach langanhaltender Stimulation des Rezeptors mit Agonisten – aber nicht mit Antagonisten – wurde eine Massen- und Mengenzunahme des Rezeptorproteins beobachtet. Es konnte gezeigt werden, dass der Rezeptor unter basalen Bedingungen einer Spaltung unterliegt. Der Massenunterschied entsteht durch die proteolytische Spaltung der Ektodomäne des PTHR, was nachfolgend die Stabilität des Rezeptors beeinträchtigt. Die Spaltung erfolgte innerhalb einer unstrukturierten Schleife der Ektodomäne, welche die Bereiche für die Ligandenbindung miteinander verbindet. Hierbei handelt es sich um eine Region, die im Vergleich zu anderen Gruppe 2-Rezeptoren spezifisch für den PTHR ist. Das durch die Spaltung entstandene N-terminale Fragment bleibt durch eine Disulfidbrücke mit dem Transmembranteil des Rezeptors verbunden. Durch Versuche mit verschiedenen Proteaseinhibitoren konnte die verantwortliche Protease der Familie der zinkabhängigen extrazellulären Proteasen zugeordnet werden. Diese Ergebnisse beschreiben einen Mechanismus wie die Homoöstase des PTHR reguliert sein könnte. In einem zweiten Abschnitt wurde die Interaktion der Adapterproteine NHERF1 und beta-Arrestin2 mit dem PTHR untersucht. Beide Proteine interagierten unabhängig mit dem Rezeptor, wobei NHERF1 über eine PDZ-Domäne konstitutiv an den C-Terminus des Rezeptors bindet. beta-Arrestin2 hingegen bindet nach Aktivierung des Rezeptors und führt zur Desensitisierung des Rezeptors. Mittels biochemischer und mikroskopischer Methoden konnte gezeigt werden, dass beide Proteine gemeinsam einen ternären Komplex mit dem PTHR bilden, welcher durch die direkte Interaktion zwischen NHERF1 und beta-Arrestin2 vermittelt wird. Dies hat zur Folge, dass beta-Arrestin im basalen Zustand durch NHERF1 an den Rezeptor gekoppelt wird. Durch Analyse der Assoziationskinetik mittels Fluoreszenz-Resonanz-Energietransfer-Messungen zeigte sich, dass diese Kopplung zu einer zweifach erhöhten Rekrutierungsgeschwindigkeit von beta-Arrestin2 an den PTHR führt. Somit stellt unterstützt NHERF1 die beta-Arrestin2-vermittelte Desensitisierung des PTHR.
Posttranslationale Modifikation von Phosducin durch den small ubiquitin-related modifier "SUMO"
(2006)
Die Rezeptor vermittelte Aktivierung heterotrimerer G-Proteine ist einer der bedeutendsten Signaltransduktionsmechanismen in vielen Organismen. Die Vielzahl unterschiedlicher Rezeptoren und Agonisten macht eine effektive Kontrolle des einzelnen Signals unumgänglich. Das zytosolische Protein Phosducin bindet beta-gamma-Untereinheiten aktivierter G-Proteine und hemmt damit sowohl Gbeta-gamma-vermittelte Effekte als auch Galpha-vermittelte Effekte. In der vorliegenden Arbeit wurde neben der bekannten 33 kDa Form von Phosducin eine weitere 47 kDa große Form in der Retina und im Herz identifiziert. Hierbei handelte es sich um Phosducin, welches mit dem small ubiquitin-related modifier, SUMO, modifiziert war. Weiterhin wurde sowohl in vitro als auch in zellulären Sytemen gezeigt, dass Phosducin mit einem Molekül SUMO an Lysin 33 modifiziert wird. Durch punktgerichtete Mutation dieser Modifikationsstelle wurde eine SUMOylierungs-defiziente Phosducin-Mutante generiert. Diese Mutante unterliegt einem gesteigerten Turnover im Vergleich zu Wildtyp-Phosducin, welcher auf die verstärke Ubiquitinierung und dem damit verbundenen proteasomalen Abbau der Mutante zurückzuführen war. Dies demonstriert, dass SUMOylierung von Phosducin protektive Wirkung auf dieses Protein hat. Darüberhinaus behindert die SUMOylierung von Phosducin dessen Bindung an Gbeta-gamma-Untereinheiten heterotrimerer G-Proteine. Diese Beobachtungen erlauben den Schluss, dass SUMOylierung neben der Phosphorylierung ein neuer und wichtiger Mechanismus ist, über den die Verfügbarkeit von Phosducin als G-Protein-Regulator kontrolliert wird.
1,25-dihydroxyvitamin D3 (1,25D3) was reported to induce premature organismal aging in fibroblast growth factor-23 (Fgf23) and klotho deficient mice, which is of main interest as 1,25D3 supplementation of its precursor cholecalciferol is used in basic osteoporosis treatment. We wanted to know if 1,25D3 is able to modulate aging processes on a cellular level in human mesenchymal stem cells (hMSC). Effects of 100 nM 1,25D3 on hMSC were analyzed by cell proliferation and apoptosis assay, beta-galactosidase staining, VDR and surface marker immunocytochemistry, RT-PCR of 1,25D3-responsive, quiescence-and replicative senescence-associated genes. 1,25D3 treatment significantly inhibited hMSC proliferation and apoptosis after 72 h and delayed the development of replicative senescence in long-term cultures according to beta-galactosidase staining and P16 expression. Cell morphology changed from a fibroblast like appearance to broad and rounded shapes. Long term treatment did not induce lineage commitment in terms of osteogenic pathways but maintained their clonogenic capacity, their surface marker characteristics (expression of CD73, CD90, CD105) and their multipotency to develop towards the chondrogenic, adipogenic and osteogenic pathways. In conclusion, 1,25D3 delays replicative senescence in primary hMSC while the pro-aging effects seen in mouse models might mainly be due to elevated systemic phosphate levels, which propagate organismal aging.
The ligand-binding subunit of the A\(_1\)-adenosine receptor has been identified by photoaffinity labeling. A photolabile derivative of R- \(N^6\)-phenylisopropyladenosine, R-2-azido-\(N^6\)-p-hydroxyphenylisopropyladenosine (R-AHPIA), has been synthesized as a covalent specific Iigand for A\(_1\)-adenosine receptors. In adenylate cyclase studies with membranes of rat fat cells and human platelets, R·AHPIA has adenosine receptor agonist activity with a more than 60-fold selectivity for the A\(_1\)-subtype. It competes for [\(^3\)H].\(N^6\)- phenylisopropyladenosine binding to Arreceptors of rat brain membranes with a Ki value of 1.6 nM. After UV irradiation, R-AHPIA binds irreversibly to the receptor, as indicated by a loss of [\(^3\)H)\(N^6\)-phenylisopropyladenosine binding afterextensive washing; the K; value for this photoinactivation is 1.3 nM. The p-hydroxyphenyl substituent of R-AHPIA can be directly radioiodinated to give a photoaffinity Iabel of high specific radioactivity (\(^{125}\)I-AHPIA). This compound has a KD value of about 1.5 nM as assessed from saturation and kinetic experiments. Adenosine analogues compete for \(^{125}\)I-AHPIA binding to rat brain membranes with an order of potency characteristic for A\(_1\)-adenosine receptors. Dissociation curves following UV irradiation at equilibrium demonstrate 30-40% irreversible specific binding. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis indicates that the probe is photoincorporated into a single peptide of M\(_r\) = 35,000. Labeling of this peptide can be blocked specifically and stereoselectively by adenosine receptor agonists and antagonists in a manner which is typical for the A\(_1\)-subtype. The results indicate that \(^{125}\)I-AHPIA identifies the ligand-binding subunit of the A\(_1\)-adenosine receptor, which is a peptide with M\(_r\) = 35,000.
Signal transduction via receptors for N-formylmethionyl peptide chemoattractants (FPR) on human neutrophils is a highly regulated process which involves participation of cytoskeletal elements. Evidence exists suggesting that the cytoskeleton and/or the membrane skeleton controls the distributJon of FPR in the plane of the plasma membrane, thus controlling the accessibility of FPR to different proteins in functionally distinct domains. In desensitized cells, FPR are restricted todomains which are depleted of G proteins but enriched in cytoskeletal proteins such as actin and fodrin. Thus, the G protein signal transduction partners of FPR become inaccessible to the agonist-occupied receptor, preventing cell activation. The mechanism of interaction of FPR with the membrane skeleton is poorly understood but evidence is accumulating that suggests a direct binding of FPR (and other receptors) to cytoskeletal proteins such as actin.