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Institute
- Institut für Pharmakologie und Toxikologie (407) (remove)
Sonstige beteiligte Institutionen
- Institut für Biopsychologie, Universität Dresden (1)
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- Johns Hopkins School of Medicine, Baltimore, MD, U.S. (1)
- Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V. (1)
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Seit langem werden auf das β-adrenerge System wirkende Pharmaka, v.a. β1-Antagonisten und β2-Agonisten, therapeutisch eingesetzt, allerdings sind die pharmakologischen Eigenschaften dieser Stoffe an den drei bekannten β-adrenergen Subtypen teilweise nur unzureichend untersucht. Ein Ziel dieser Arbeit war es daher, vergleichbare pharmakologische Daten für Agonisten (Adrenalin, Noradrenalin, Isoprenalin, Fenoterol, Salbutamol, Salmeterol, Terbutalin, Formoterol, Broxaterol) und Neutrale und Inverse Antagonisten (Propranolol, Alprenolol, Atenolol, Metoprolol, Bisoprolol, Carvedilol, Pindolol, BRL 37344, CGP 20712, SR 59230A, CGP 12177, ICI 118551) an allen drei Subtypen von adrenergen Rezeptoren in einem zellbiologisch identischen Hintergrund zu gewinnen. Dazu stellten wir stabil transfizierte CHO-Zelllinien her, die die einzelnen humanen β-adrenergen Subtypen in vergleichbarer Menge exprimierten. Nach der pharmakologischen Charakterisierung der einzelnen Rezeptorsubtypen erfolgte die Affinitätsmessung von klinisch häufig eingesetzten wie auch experimentell verwendeten Substanzen mit dem unselektiven β-adrenergen Antagonisten 125I-CYP als Radioligand. Darüber hinaus untersuchten wir die β-adrenerg vermittelte Stimulation der Adenylylcyclase in isolierten Membranen dieser Zelllinien. Alle untersuchten Substanzen zeigten charakteristische Bindungs- und funktionale Eigenschaften. Wir konnten nachweisen, dass einige β2- bzw. β3-Agonisten an den anderen Subtypen inversen Agonismus zeigen. Zusätzlich konnten β1-Antagonisten mit agonistischer Aktivität an β2- und β3-AR gefunden werden. Die gewonnenen Daten können somit helfen, klinisch beobachtete Effekte, wie z.B. die unerwünschten Wirkungen der entsprechenden Medikamente, besser zu verstehen. Insbesondere die Ergebnisse am β3-AR sind als Referenz und Ausgangspunkt weiterer Studien an diesem noch relativ wenig untersuchten Rezeptor wertvoll.
Insulin ist ein essentielles Hormon im menschlichen Körper, welches für die Senkung der Blutglukosekonzentration, die Bildung von Energiespeichern und das Zellwachstum verantwortlich ist. Eine mit der Fehlregulation der Insulinproduktion einhergehenden Krankheit ist der Diabetes mellitus. Für diese Arbeit spielt der Typ 2 dieser Erkrankung eine wichtige Rolle. Es entwickelt sich bei Patienten mit diesem Typ des Diabetes mellitus langsam eine Insulinresistenz, die zunächst durch eine kompensatorische Überproduktion von Insulin charakterisiert ist. Dieser Zustand der Hyperinsulinämie kann Jahre bis Jahrzehnte andauern, ehe es zu einem Versagen der ß-Zellen des Pankreas und somit zu einer Hypoinsulinämie kommt. In dieser Arbeit war es Ziel herauszufinden, ob diese lange Zeit herrschende Hyperinsulinämie einen Einfluss auf die menschliche DNA hat. Die Genotoxizität von hohen Insulinkonzentrationen wurde in Hep-G2 Zellen, HT29 Zellen, sowie primären humanen peripheren Lymphozyten mithilfe des Comet Assays und des Mikrokerntests nachgewiesen. Oxidativer Stress bzw. dessen Reduzierung durch Antioxidantien und Inhibitoren wurde in HT29 Zellen mithilfe der DHE-Färbung detektiert. Diese Arbeit belegt dass sich Insulin schädigend auf das menschliche Genom in vitro auswirken kann. Eine besondere Relevanz haben die durchgeführten Experimente mit primären menschlichen Lymphozyten. Denn bei ihnen handelt es sich um Zellen, die im Gegensatz zu der auch genutzten humanen Leberkarzinomzelllinie Hep-G2 und der humanen Kolonkarzinomzelllinie HT29 nicht transformiert sind. Eine weitere wesentliche Erkenntnis dieser Arbeit ist, dass schon pathophysiologisch vorliegende Insulinkonzentrationen in der Lage sind Genomschädigungen in vitro zu induzieren. HT29 Zellen zeigten bei Kurzzeitbehandlung mit nur 1nM Insulin eine signifikante Erhöhung der DNA-Schädigung. Bei Langzeitexposition von 6 Tagen konnten schon 0,5nM signifikante DNA-Schäden hervorrufen. Diese durch Insulin hervorgerufenen Schäden könnten, falls sie so auch in vivo entstehen, bei Versagen von Reparaturmechanismen zur Entstehung von Mutationen und sich daraus entwickelnden Karzinomen beitragen. Aus diesem Grund war ein weiteres Ziel dieser Arbeit herauszufinden, ob bestimmte Antioxidantien oder Inhibitoren in der Lage sind die Insulin-induzierten Genomschädigungen zu verringern. Hierfür wurde Tempol, Apocynin, Plumbagin, VAS2870, Rotenone, PPP, HNMPA-(AM)3 und Wortmannin genutzt. Tatsächlich sind diese Substanzen in der Lage die durch Insulin hervorgerufene Schädigung zu reduzieren. Die positiven Ergebnisse dieser Arbeit könnten einen ersten Hinweis auf eine mögliche pharmakologische Intervention bei Hyperinsulinämie mit dem Ziel der Senkung des erhöhten Krebsrisikos geben. Eine wichtige Erkenntnis aus den Ergebnissen meiner Arbeit ist, dass die Reduzierung des oxidativen Stresses eine Reduzierung der Genomschädigung bewirkt. Die genutzten Substanzen Apocynin, Tempol, VAS2870 und Rotenone bewirkten in HT29 Zellen eine signifikante Reduzierung des durch Insulin ausgelösten oxidativen Stresses. Um aber genauere Aussagen über Möglichkeiten der Therapie bei Hyperinsulinämie zu treffen, sollten Folgestudien auch in vivo folgen, welche die in dieser Arbeit beschriebenen Effekte bestätigen.
Patienten mit erhöhten Aldosteronspiegeln zeigen eine gesteigerte Inzidenz für Malignome, insbesondere von Nierenzellkarzinomen. Das Ziel dieser Arbeit war es, die Aldosteron-vermittelte oxidative Nierenschädigung näher zu analysieren sowie die auf Zellebene gezeigte Beeinflussung der antioxidativen Schutzmechanismen im lebenden Organismus nachzuweisen und mögliche therapeutische Ansatzpunkte zu identifizieren. Dazu wurde ein Interventions-versuch über 28 Tage durchgeführt. Neben einer Aldosterongabe wurden folgende Interventionen verwendet: Spironolacton zur Blockade des Mineralkortikoid-Rezeptors (MR), Apocynin als Hemmstoff der NADPH-Oxidasen (Nox), L-NAME zur Blockade der NO-Synthasen (NOS), PDTC, einen Hemmstoff des Transkriptionsfaktors NF-kB sowie Sulforaphan, ein natürlicher Nrf2-Induktor. Eine weitere Gruppe erhielt Sulforaphan ohne additive Aldosterongabe. Die Nierenschäden wurden mittels histopathologischer Schädigungsscores und der Anzahl an DNA-Doppelstrangbrüche analysiert. Die Beeinflussung der antioxidativen Abwehr wurde durch die Aktivierung des Transkriptionsfaktors Nrf2 und durch die Quantifizierung antioxidativer Enzyme bestimmt.
Im Nierengewebe führte Aldosteron zu einer Zunahme von oxidativem Stress. Histologisch zeigte sich ein Anstieg von glomerulären Schäden. Auch kam es zu einer deutlichen Zunahme von Doppelstrangbrüchen der DNA. Des Weiteren konnten wir zeigen, dass Aldosteron auch in vivo zu einer Zunahme der Nrf2-Aktivität führte, wobei sich dies auf Proteinebene nicht in einer (dauerhaften) Synthesesteigerung von antioxidativen Enzymen wiederspiegelte und keinen ausreichenden Schutz des Nierengewebes bot. Für die Interventionsgruppen konnte keine signifikante Auswirkung auf das Vorliegen von oxidativem Stress gezeigt werden. Dies könnte an der Versuchsdauer bzw. an der gewählten Nachweismethode gelegen haben. Nichtsdestotrotz zeigte die Blockade der Nox durch Apocynin bzw. der NOS durch L-NAME eine effektive Reduktion der histologischen und genomischen Schäden. Die L-NAME-Gruppe wies dabei die höchsten Blutdruckwerte auf, diese waren auch zur Aldosterongruppe signifikant gesteigert. Die beobachteten Effekte waren folglich nicht durch den in der Aldosterongruppe erfolgten Blutdruckanstieg, sondern vielmehr durch den Anstieg von oxidativem Stress zu erklären. Ebenfalls blieb die Nrf2-Aktivität bei der Gabe von Apocynin und L-NAME weitgehend auf Kontrollniveau, was dafürspricht, dass der in der Aldosterongruppe messbare Nrf2-Anstieg am ehesten als Reaktion auf chronisch erhöhten oxidativen Stress erfolgte, welcher durch die Interventionen ausblieb. Die Blockade von NF-κB mittels PDTC führte zu vergleichbaren Effekten wie Apocynin und L-NAME. Das deutet darauf hin, dass Aldosteron über die Aktivierung von NF-κB die vermehrte Synthese von pro-oxidativen Enzymen wie Nox und NOS anregt. Die Gabe von Spironolacton hatte den stärksten protektiven Effekt, sowohl auf histologische Veränderungen als auch auf das Entstehen von DNA-Doppelstrangbrüchen, wobei die Nrf2-Aktivität in dieser Gruppe ebenfalls auf Kontrollniveau blieb. Die Aldosteroneffekte wurden folglich über den MR vermittelt. Eine additive Nrf2-Induktion mittels Sulforaphan konnte auch keinen (dauerhaften) Effekt auf die Synthese antioxidativer Enzyme zeigen. Dennoch zeigte diese Gruppe einen ähnlich effektiven Schutz vor den oxidativen Nierenschäden wie die Gabe von Spironolacton. Vieles spricht dafür, dass die Wirkung von Sulforaphan dabei über seine Wirkung als direktes Antioxidans bzw. Radikalfänger und nicht über den Nrf2-Weg zu erklären ist.
Aldosteron führt in der Niere über oxidativen Stress zu glomerulärer Fibrose und DNA-Schäden. Das könnte eine Erklärung für die gesteigerte Inzidenz von Nierenzellkarzinomen in Patienten mit erhöhten Aldosteronspiegeln darstellen. Unsere Ergebnisse sprechen dafür, dass Aldosteron über eine Signalkaskade über den MR zu einer Aktivierung von Nox und NOS führt. Der Aktivierung des Transkriptionsfaktors NF-κB scheint dabei durch die Synthese pro-oxidativer Enzyme eine Art Verstärker-Effekt zuzukommen. Als Reaktion auf den durch Aldosteron gesteigerten oxidativen Stress kommt es zu einer Aktivierung des antioxidativen Transkriptionsfaktors Nrf2, jedoch ohne dass dies zu einem ausreichenden Schutz des Nierengewebes führt. Mögliche therapeutische Ansatzpunkte für einen Schutz vor den durch Aldosteron vermittelten oxidativen Nierenschäden scheinen eher innerhalb der Aldosteronsignalkaskade, insbesondere in der Blockade des MR, als in der antioxidativen Abwehr zu liegen.
In their role as second messengers, cyclic nucleotides such as cAMP have a variety of intracellular effects. These complex tasks demand a highly organized orchestration of spatially and temporally confined cAMP action which should be best achieved by compartmentalization of the latter. A great body of evidence suggests that cAMP compartments may be established and maintained by cAMP degrading enzymes, e.g. phosphodiesterases (PDEs). However, the molecular and biophysical details of how PDEs can orchestrate cAMP gradients are entirely unclear. In this paper, using fusion proteins of cAMP FRET-sensors and PDEs in living cells, we provide direct experimental evidence that the cAMP concentration in the vicinity of an individual PDE molecule is below the detection limit of our FRET sensors (<100nM). This cAMP gradient persists in crude cytosol preparations. We developed mathematical models based on diffusion-reaction equations which describe the creation of nanocompartments around a single PDE molecule and more complex spatial PDE arrangements. The analytically solvable equations derived here explicitly determine how the capability of a single PDE, or PDE complexes, to create a nanocompartment depend on the cAMP degradation rate, the diffusive mobility of cAMP, and geometrical and topological parameters. We apply these generic models to our experimental data and determine the diffusive mobility and degradation rate of cAMP. The results obtained for these parameters differ by far from data in literature for free soluble cAMP interacting with PDE. Hence, restricted cAMP diffusion in the vincinity of PDE is necessary to create cAMP nanocompartments in cells.
The effects of barbiturates on the GABA·receptor complex and the A\(_1\) adenosine receptor were studied. At the GABA-receptor complex the barbiturates inhibited the binding of [\(^{35}\)S]t-butylbicyclophosphorothionate [\(^{35}\)S]TBPT) and enhanced the binding of [\(^3\)H]diazepam. Kinetic and saturation experiments showed that both effects were allosteric. Whereas all barbiturates caused complete inhibition of [\(^{35}\)S]TBPT binding, they showed varying degrees of maximal enhancement of [\(^3\)H]diazepam binding; (±)methohexital was idenafied as the most efficacious compound for this enhancement. At the A\(_1\) adenosine receptor all barbiturates inhibited the binding of [\(^3\)H]N\(^6\)-phenylisopropyladenosine (\(^3\)H]PIA) in a competitive manner. The comparison of the effects on [\(^3\)H]diazepam and [\(^3\)H]PIA binding showed that excitatory barbiturates interact preferentially with the A\(_1\) adenosine receptor, and sedative/anaesthetic barbiturates with the GABA-receptor complex. It is speculated that the interaction with these two receptors might be the basis of the excitatory versus sedative/ anaesthetic properties of barbiturates.
Human platelet membranes were solubilized with the zwitterionic detergent CHAPS (3-[3-(cholamidopropyl)dimethylammonio]- 1-propanesulfonate) and the solubilized extract subjected to gel ftltration. Binding of the adenosine receptor agonist [\(^3\)H]NECA (5'-N-ethylcarboxamidoadenosine) was measured to the eluted fractions. Two [\(^3\)H]NECA binding peaks were eluted, the first of them with the void volume. This first peak represented between 10% and 25% of the [\(^3\)H]NECA binding activity eluted from the column. It bound [\(^3\)H]NECA in a reversible, saturable and GTPdependent manner with an affinity of 46 nmol/1 and a binding capacity of 510 fmol/mg protein. Various adenosine receptor ligands competed for the binding of [\(^3\)H]NECA to the frrst peak with a pharmacological proftle characteristic for the A\(_2\) adenosine receptor as determined from adenylate cyclase experiments. In contrast, most adenosine receptor ligands did not compete for [\(^3\)H]NECA binding to the second, major peak. These results suggest that a solubilized A\(_2\) receptor-Gs protein complex of human platelets can be separated from other [\(^3\)H]NECA binding sites by gel filtration. This allows reliable radioligand binding studies of the A2 adenosine receptor of human plate1ets.
Adenosine modulates a variety of physiological functions via membrane-bound receptors. These receptors couple via G proteins to adenylate cyclase and K+channels. The A1 subtype mediates an inhibition of adenylate cyclase and an opening of K+-channels, and the A2 subtype a Stimulation of adenylate cyclase. Both subtypes have been characterized by radioligand binding. This has facilitated the development of agonists and antagonists with more than 1000-fold A1 selectivity. A1-selective photoaffinity labels have been used for the biochemical characterization of A1 receptors and the study of their coupling to adenylate cyclase. Such selective ligands allow the analysis of the involvement of adenosine receptors in physiological functions. Selective interference with adenosine receptors provides new pharmacological tools and eventually new therapeutic approaches to a number of pathophysiological states.
The binding of \([^3H]\)phenobarbital to rat brain membranes was studied in order to determine its characteristics and specificity. The binding reaction was rapid and occurred at sites of low affinity. \((K_d = 700 μM)\) and very high density \((B_{max} = 2.7 nmoll/mg protein)\). It was unaffected by temperature changes from O°C to 95°C and was maximal at pH 5. Detergents in low concentrations markedly decreased the binding, apparently without solubilizing the binding sites. It is concluded that the binding of \([^3H]\) phenobarbital is a rather non-specific interaction with the plasma membrane.
Tbe 2',3'-dideoxy analogue of the potent A\(_1\) receptor agonist, N\(^6\)-cyclohexyladenosine (CHA), was synthesized as a potential antagonist for the A\(_1\) adenosine receptor. In sturlies on adenylate cyclase 2',3'-dideoxy-N\(^6\)-cyclohexyladenosine (ddCHA) did not show agonist properties at A\(_1\) or at A\(_2\) receptors. However, it antagonized the inhibition by R-PIA of adenylate cyclase activity of fat cell membranes via A\(_1\) receptors with a K\(_i\) value of 13 \(\mu\)M. ddCHA competed for the binding of the selective A1 receptor antagonist, [\(^3\) HJ8-cyclopentyl-1,3-dipropylxantbine ([\(^3\)H]DPCPX), to rat brain membranes with a K\(_i\) value of 4.8 \(\mu\)M; GTP did not affect the competition curve. In contrast to the marked stereoselectivity of the A\(_1\) receptor for the cx- and the natural ß-anomer of adenosine, the cx-anomer of ddCHA showed a comparable affinity for the A\(_1\) receptor (K\(_i\) value 13.9 \8\mu\)M). These data indicate that the 2'- and 3'-hydroxy groups of adenosine and its derivatives are required foragonist activity at and high affinity binding to A\(_1\) adenosine receptors and for the distinction between the cx- and ß-forms.
Barbiturates in pharmacologically relevant . concentrations inhibit binding of (R)-\(N^6\)-phenylisopropyl[\(^3\)H]adenosine ([\(^3\)H]PIA) to solubilized A\(_1\) adenosine receptors in a concentration-dependent, stereospecific, and competitive manner. K\(_i\) values are similar to those obtained for membrane-bound receptors and are 31 \(\mu\)M for ( ± )-5-(1 ,3-dimethyl)-5-ethylbarbituric acid [( ± )DMBB] and 89 \(\mu\)M for ( ± )-pentobarbital. Kinetic experiments demoostrate that barbiturates compete directly for the binding site of the receptor. The inhibition of rat striatal adenylate cyclase by unlabelled (R)-\(N^6\)-phenylisopropyladenosine [(R)-PIA] is antagonized by barbiturates in the same concentrations that inhibit radioligand binding. The Stimulation of adenylate cyclase via A\(_2\) adenosine receptors in membranes from NIE 115 neuroblastoma cells is antagonized only by 10-30 times higher concentrations of barbiturates. lt is concluded that barbiturates are selective antagonists at the A1 receptor subtype. In analogy to the excitatory effects of methylxanthines it is suggested that A\(_1\) adenosine receptor antagonism may convey excitatory properties to barbiturates. Key Words: Adenosine receptors-Barbiturates - Adenylate cyclase-Receptor solubilization-[3H]PIA binding-N1E 115 cells. Lohse M. J. et al. Barbiturates are selective antagonists at A1 adenosine receptors.