Institut für Pharmakologie und Toxikologie
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Institute
- Institut für Pharmakologie und Toxikologie (407)
- Graduate School of Life Sciences (38)
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- Institut für Biopsychologie, Universität Dresden (1)
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G protein-coupled receptors (GPCRs) form the biggest receptor family that is encoded in the human genome and represent the most druggable target structure for modern therapeutics respectively future drug development. Belonging to aminergic class A GPCRs muscarinic Acetylcholine receptors (mAChRs) are already now of clinical relevance and are also seen as promising future drug targets for treating neurodegenerative diseases like Alzheimer or Parkinson. The mAChR family consist of five subtypes showing high sequence identity for the endogenous ligand binding region and thus it is challenging until now to selectively activate a single receptor subtype. A well accepted method to study ligand binding, dynamic receptor activation and downstream signaling is the fluorescence resonance energy transfer (FRET) application. Here, there relative distance between two fluorophores in close proximity (<10 nm) can be monitored in a dynamic manner. The perquisite for that is the spectral overlap of the emission spectrum of the first fluorophore with the excitation spectrum of the second fluorophore. By inserting two fluorophores into the molecular receptor structure receptor FRET sensors can serve as a powerful tool to study dynamic receptor pharmacology.
Dualsteric Ligands consist of two different pharmacophoric entities and are regarded as a promising ligand design for future drug development. The orthosteric part interacts with high affinity with the endogenous ligand binding region whereas the allosteric part binds to a different receptor region mostly located in the extracellular vestibule. Both moieties are covalently linked. Dualsteric ligands exhibit a dynamic ligand binding. The dualsteric binding position is characterized by a simultaneous binding of the orthosteric and allosteric moiety to the receptor and thus by receptor activation. In the purely allosteric binding position no receptor activation can be monitored.
In the present work the first receptor FRET sensor for the muscarinic subtype 1 (M1) was generated and characterized. The M1-I3N-CFP sensor showed an unaltered physiological behavior as well as ligand and concentration dependent responses. The sensor was used to characterize different sets of dualsteric ligands concerning their pharmacological properties like receptor activation. It was shown that the hybrids consisting of the synthetic full agonist iperoxo and the positive allosteric modulator of BQCA type is very promising. Furthermore, it was shown for orthosteric as well as dualsteric ligands that the degree of receptor activation is highly dependent on the length of and the chemical properties of the linker moiety. For dualsteric ligands a bell-shaped activation characteristic was reported for the first time, suggesting that there is an optimal linker length for dualsteric ligands. The gained knowledge about hybrid design was then used to generate and characterize the first photo-switchable dualsteric ligand. The resulting hybrids were characterized with the M1-I3N-CFP sensor and were described as photo-inactivatable and dimmable. In addition to the ligand characterization the ligand application methodology was further developed and improved. Thus, a fragment-based screening approach for dualsteric ligands was reported in this study for the first time. With this approach it is possible to investigate dualsteric ligands in greater detail by applying either single ligand fragments alone or in a mixture of building blocks. These studies revealed the insights that the effect of dualsteric ligands on a GPCR can be rebuild by applying the single building blocks simultaneously. The fragment-based screening provides high potential for the molecular understanding of dualsteric ligands and for future screening approaches. Next, a further development of the standard procedure for measuring FRET by sensitized emission was performed. Under normal conditions single cell FRET is measured on glass coverslips. After coating the coverslips surface with a 20 nm thick gold layer an increased FRET efficiency up to 60 % could be reported. This finding was validated in different approaches und in different configurations. This FRET enhancement by plasmonic surfaces was until yet unreported in the literature for physiological systems and make FRET for future projects even more powerful.
Currently, genotyping of patients for polymorphic enzymes responsible for metabolic elimination is considered a possibility to adjust drug dose levels. For a patient to profit from this procedure, the interindividual differences in drug metabolism within one genotype should be smaller than those between different genotypes. We studied a large cohort of healthy young adults (283 subjects), correlating their CYP2C9 genotype to a simple phenotyping metric, using flurbiprofen as probe drug. Genotyping was conducted for CYP2C9*1, *2, *3. The urinary metabolic ratio MR (concentration of CYP2C9-dependent metabolite divided by concentration of flurbiprofen) determined two hours after flurbiprofen (8.75 mg) administration served as phenotyping metric. Linear statistical models correlating genotype and phenotype provided highly significant allele-specific MR estimates of 0.596 for the wild type allele CYP2C9*1, 0.405 for CYP2C9*2 (68 % of wild type), and 0.113 for CYP2C9*3 (19 % of wild type). If these estimates were used for flurbiprofen dose adjustment, taking 100 % for genotype *1/*1, an average reduction to 84 %, 60 %, 68 %, 43 %, and 19% would result for genotype *1/*2, *1/*3, *2/*2, *2/*3, and *3/*3, respectively. Due to the large individual variation within genotypes with coefficients of variation >= 20% and supposing the normal distribution, one in three individuals would be out of the average optimum dose by more than 20 %, one in 20 would be 40% off. Whether this problem also applies to other CYPs and other drugs has to be investigated case by case. Our data for the given example, however, puts the benefit of individual drug dosing to question, if it is exclusively based on genotype.
Fluorescence Dequenching Makes Haem-Free Soluble Guanylate Cyclase Detectable in Living Cells
(2011)
In cardiovascular disease, the protective NO/sGC/cGMP signalling-pathway is impaired due to a decreased pool of NO-sensitive haem-containing sGC accompanied by a reciprocal increase in NO-insensitive haem-free sGC. However, no direct method to detect cellular haem-free sGC other than its activation by the new therapeutic class of haem mimetics, such as BAY 58-2667, is available. Here we show that fluorescence dequenching, based on the interaction of the optical active prosthetic haem group and the attached biarsenical fluorophor FlAsH can be used to detect changes in cellular sGC haem status. The partly overlap of the emission spectrum of haem and FlAsH allows energy transfer from the fluorophore to the haem which reduces the intensity of FlAsH fluorescence. Loss of the prosthetic group, e. g. by oxidative stress or by replacement with the haem mimetic BAY 58-2667, prevented the energy transfer resulting in increased fluorescence. Haem loss was corroborated by an observed decrease in NO-induced sGC activity, reduced sGC protein levels, and an increased effect of BAY 58-2667. The use of a haem-free sGC mutant and a biarsenical dye that was not quenched by haem as controls further validated that the increase in fluorescence was due to the loss of the prosthetic haem group. The present approach is based on the cellular expression of an engineered sGC variant limiting is applicability to recombinant expression systems. Nevertheless, it allows to monitor sGC's redox regulation in living cells and future enhancements might be able to extend this approach to in vivo conditions.
Aims: Although mortality rate is very high, diagnosis of acute myocarditis remains challenging with conventional tests. We aimed to elucidate the potential role of longitudinal 2-Deoxy-2-\(^{18}\)F-fluoro-D-glucose (\(^{18}\)F-FDG) positron emission tomography (PET) inflammation monitoring in a rat model of experimental autoimmune myocarditis.
Methods and results: Autoimmune myocarditis was induced in Lewis rats by immunizing with porcine cardiac myosin emulsified in complete Freund’s adjuvant. Time course of disease was assessed by longitudinal \(^{18}\)F-FDG PET imaging. A correlative analysis between in- and ex vivo \(^{18}\)F-FDG signalling and macrophage infiltration using CD68 staining was conducted. Finally, immunohistochemistry analysis of the cell-adhesion markers CD34 and CD44 was performed at different disease stages determined by longitudinal \(^{18}\)F-FDG PET imaging. After immunization, myocarditis rats revealed a temporal increase in 18F-FDG uptake (peaked at week 3), which was followed by a rapid decline thereafter. Localization of CD68 positive cells was well correlated with in vivo \(^{18}\)F-FDG PET signalling (R\(^2\) = 0.92) as well as with ex vivo 18F-FDG autoradiography (R\(^2\) = 0.9, P < 0.001, respectively). CD44 positivity was primarily observed at tissue samples obtained at acute phase (i.e. at peak 18F-FDG uptake), while CD34-positive staining areas were predominantly identified in samples harvested at both sub-acute and chronic phases (i.e. at \(^{18}\)F-FDG decrease).
Conclusion: \(^{18}\)F-FDG PET imaging can provide non-invasive serial monitoring of cardiac inflammation in a rat model of acute myocarditis.
Anxiety and depressive disorders result from a complex interplay of genetic and environmental factors and are common mutual comorbidities. On the level of cellular signaling, regulator of G protein signaling 2 (Rgs2) has been implicated in human and rodent anxiety as well as rodent depression. Rgs2 negatively regulates G protein-coupled receptor (GPCR) signaling by acting as a GTPase accelerating protein towards the Gα subunit.
The present study investigates, whether mice with a homozygous Rgs2 deletion (Rgs2-/-) show behavioral alterations as well as an increased susceptibility to stressful life events related to human anxiety and depressive disorders and tries to elucidate molecular underlying’s of these changes.
To this end, Rgs2-/- mice were characterized in an aversive-associative learning paradigm to evaluate learned fear as a model for the etiology of human anxiety disorders. Spatial learning and reward motivated spatial learning were evaluated to control for learning in non-aversive paradigms. Rgs2 deletion enhanced learning in all three paradigms, rendering increased learning upon deletion of Rgs2 not specific for aversive learning. These data support reports indicating increased long-term potentiation in Rgs2-/- mice and may predict treatment response to conditioning based behavior therapy in patients with polymorphisms associated with reduced RGS2 expression. Previous reports of increased innate anxiety were corroborated in three tests based on the approach-avoidance conflict. Interestingly, Rgs2-/- mice showed novelty-induced hypo-locomotion suggesting neophobia, which may translate to the clinical picture of agoraphobia in humans and reduced RGS2 expression in humans was associated with a higher incidence of panic disorder with agoraphobia. Depression-like behavior was more distinctive in female Rgs2-/- mice. Stress resilience, tested in an acute and a chronic stress paradigm, was also more distinctive in female Rgs2-/- mice, suggesting Rgs2 to contribute to sex specific effects of anxiety disorders and depression.
Rgs2 deletion was associated with GPCR expression changes of the adrenergic, serotonergic, dopaminergic and neuropeptide Y systems in the brain and heart as well as reduced monoaminergic neurotransmitter levels. Furthermore, the expression of two stress-related microRNAs was increased upon Rgs2 deletion. The aversive-associative learning paradigm induced a dynamic Rgs2 expression change. The observed molecular changes may contribute to the anxious and depressed phenotype as well as promote altered stress reactivity, while reflecting an alter basal stress level and a disrupted sympathetic tone. Dynamic Rgs2 expression may mediate changes in GPCR signaling duration during memory formation.
Taken together, Rgs2 deletion promotes increased anxiety-like and depression-like behavior, altered stress reactivity as well as increased cognitive function.
In der vorliegenden Arbeit wurden die Einflüsse verschiedener genotoxischer Substanzen auf Säugertierzellen untersucht. Da ein Organismus der Ontogenese unterliegt und sich Zellen aus Stamm- und Vorläuferzellen entwickelt, gilt es diese ursprünglichen Zellen vor äußeren Einflüssen zu schützen. Da bisher kaum Untersuchungen von Zellen in verschiedenen Differenzierungsstadien durchgeführt wurden, wurden unter Verwendung vieler unterschiedlicher biologischer Endpunkte Effekte auf die Vitalität, Proliferation, Mitose und Apoptose dieser Zellen untersucht. Zudem erfolgte eine Interpretation der Ausbildung von Mikrokernen, Entstehung von DNS-Schäden und der zugrundeliegenden Reparaturmechanismen.
So konnte mit Hilfe der Untersuchungen der hämatopoetischen Stammzellen und der TK6-Zellen postuliert werden, dass hämatopoetische Stammzellen weitestgehend weniger empfindlich gegenüber Zytostatika (Doxorubicin, Vinblastin, Methylmethansulfonat und Mitomycin C) sind als die lymphoblastoide Zelllinie TK6, welche in der Entwicklungshierarchie den Stammzellen folgt. Die Befürchtung, dass der Mikrokerntest in immortalisierten TK6-Zellen als Grundlage für Genotoxizitätsuntersuchungen nicht genügen würden, konnte mit Hilfe der Versuchsergebnisse dieser Arbeit widerlegt werden. Die Ergebnisse belegen, dass der Mikrokerntest in TK6-Zellen relevant ist, da TK6-Zellen empfindlicher auf genotoxische Agentien im Vergleich zu hämatopoetischen Stammzellen reagieren.
Bei der Untersuchung der Leukämiezelllinie HL-60 wurden die Effekte klassischer (Vinblastin, Vincristin, Vinflunin und Vinorelbin) mit neu synthetisierten Vinca-Alkaloiden (4-Chlorochablastin, 4-Chlorochacristin, 16a, 17b und 18a) verglichen. Vinca-Alkaloide werden sehr häufig mit Nebenwirkungen, wie Neuropathien assoziiert, welche während einer Chemotherapie oftmals zu Therapieabbrüchen durch die Patienten führen. Aus diesem Grund war es erstrebenswert, neuartige Vinca-Alkaloide zu entwickeln, welche weniger Nebenwirkungen aber zugleich eine ähnliche Wirksamkeit aufweisen. Obwohl die Potenz der neuen Substanzen niedriger war als bei Vinblastin, Vincristin und Vinorelbin, zeigte ein Teil eine ähnliche Wirkung wie das Vinca-Alkaloid Vinflunin auf die Krebszelllinie HL-60 auf. Die Ergebnisse diese Arbeit können als erste Indikation in vitro genommen werden, dass sich diese Substanzen in der Krebstherapie als wirksam erweisen könnten und nach weiteren Ergebnissen in vivo als therapeutische Alternativen in Betracht gezogen werden.
Auch bei der vergleichenden Untersuchung von exponentiell wachsenden mit differenzierten Zelllinien konnten Unterschiede detektiert werden. Die Zelllinie HT-22, welche selbst keine Krebszelllinie ist, zeigte nach Differenzierung zu nicht exponentiell wachsenden Zellen eine erhöhte Empfindlichkeit gegenüber dem Alkylanz Methylmethansulfonat, was auf einer verminderten Basenexzisionsreparatur beruhen könnte. Auch die differenzierte Form der Adenokarzinom-Zelllinie CaCo2 zeigte eine gesteigerte Sensitivität gegenüber dem Topoisomerase II-Inhibitor Etoposid auf, wohingegen der unselektive Topoisomerase II-Hemmer Doxorubicin keinen Effekt aufwies. Um den Sachverhalt zu klären ob die festgestellten Unterschiede auf das Enzym Topoisomerase II zurückzuführen oder zellartspezifisch waren, wurden weitere Analysen der Zelllinien HL-60 und deren differenzierten Zellart durchgeführt. Auch hier konnten signifikante Unterschiede bei der Einzelzellgelelektrophorese nach Behandlung mit Doxorubicin und Etoposid festgestellt werden. Neben den in dieser Arbeit nachgewiesenen Unterschieden bei der Reparatur zwischen den Zelltypen, könnten aber auch weitere Faktoren zu Varianzen führen und die Mutagenitätsforschung beeinflussen. Folglich ist davon auszugehen, dass zukünftige Testungen bei der pharmakologischen Substanzentwicklung in verschiedenen Zellsystemen von Nöten sind, bevor neue Substanzen zugelassen werden.
Alles in allem konnte die Komplexität der Ergebnisse zwischen Zellen der verschiedenen Differenzierungsstadien in dieser Arbeit aufgezeigt werden. Deswegen sollte auch bei weiteren Forschungsvorhaben insbesondere ein Augenmerk auf den Differenzierungszustand der zu untersuchenden Zellpopulation geworfen werden.
The second messenger cyclic AMP (cAMP) plays an important role in synaptic plasticity. Although there is evidence for local control of synaptic transmission and plasticity, it is less clear whether a similar spatial confinement of cAMP signaling exists. Here, we suggest a possible biophysical basis for the site-specific regulation of synaptic plasticity by cAMP, a highly diffusible small molecule that transforms the physiology of synapses in a local and specific manner. By exploiting the octopaminergic system of Drosophila, which mediates structural synaptic plasticity via a cAMP-dependent pathway, we demonstrate the existence of local cAMP signaling compartments of micrometer dimensions within single motor neurons. In addition, we provide evidence that heterogeneous octopamine receptor localization, coupled with local differences in phosphodiesterase activity, underlies the observed differences in cAMP signaling in the axon, cell body, and boutons.
Das Spurenelement Selen und Vitamin E reduzieren reaktive Sauerstoff Spezies (ROS). Bei Mangel dieser wichtigen Stoffe erhöht sich die Konzentration an ROS und der oxidative Stress steigt. Unter erhöhten ROS entstehen vermehrt DNA-Schäden und Lipidperoxidationen.
Das ROS Wasserstoffperoxid wird zu Wasser über das Enzym Gluthationperxoidase reduziert. Dessen Aktivität steigert Selen um den Faktor 100-1.000. Das Aktivitätsmaximum des Enzyms liegt bei einer täglichen Selenaufnahme von 60-80 Mikrogramm/Tag. Dadurch wird die Menge an ROS reduziert und der oxidative Stress in der Zelle nimmt ab. Vitamin E fungiert als Radikalfänger. Sein Derivat alpha- Tocopherol besitzt die höchste antioxidative Wirkung und kann Lipidperoxidationen unterbrechen.
Die vorliegende Arbeit untersucht Auswirkungen von oxidativem Stress, den ein Mangel von Selen und Vitamin E in der Nahrung bei 6 Monate und 12 Monate alten Tieren auf Leber und Niere verursacht. Der Nachweis von oxidativem Stress erfolgte über sogenannte Hitzeschockproteine HSP70 und Hämoxygenase 1.
HSP 70 wird auch unter physiologischen Bedingungen exprimiert. Es wirkt als Chaperon und ist u.a. für die korrekte Faltung und Stabilisierung von Proteinen zuständig. Die Versuche zeigten, dass im Alter in der Niere die HSP70 Konzentration ansteigt und die Zelle unter vermehrtem oxidativen Stress leidet. Entsprechende Literaturergebnisse wurden bestätigt.
Die Hämoxygenase 1 (HO-1) ist ein Schlüsselenzym, das vermehrt bei oxidativem Stress gebildet wird. Hoch reaktionsfreudige und freie Blutbestandteile katalysiert die Hämoxygenase. Einen Abfall der HO- 1 Konzentration zeigten Untersuchungen von Leber und Niere bei Selen, - Vitamin E Mangel und höherem Lebensalter. Gründe für die verminderte Expression sind noch wenig erforscht.
Die vermehrte Anreicherung von Superoxidanionradikalen wurde in den Geweben von Leber und Niere über Dihydroethidium (DHE) Färbung nachgewiesen. Die Hypothese wurde bestätigt, dass bei Selen, -Vitamin E Mangelnahrung und höherem Alter vermehrter oxidativer Stress entsteht.
Selenmangel begünstigt die Entstehung verschiedener Krankheiten, z.B. Krebs, koronale Herzerkrankung und vor allem die Keshan-Krankheit, die den Herzmuskel befällt. Selen nimmt positiven Einfluss auf Körperfunktionen: Fertilität, embryonalen Entwicklung und Entwicklung eines Neugeborenen. Einige Fragen bleiben ungeklärt: Welche physiologischen Entwicklungsprozesse fördert Selen? Nimmt Selen eine wichtige Funktion bei der Befruchtung der Eizelle ein? Wie beeinflusst Selen die Entwicklung des Gehirns?
Dem Spurenelement Selen kommen offensichtlich neben seiner Bedeutung zur Minderung des oxidativen Stresses noch weitere wichtige Funktionen zu, die bisher wenig untersucht wurden.
Purpose:
The purpose of this study was to determine possible genotoxic effects of a new very promising antibacterial/ antiviral drug FS-1.
Methods:
The drug was tested in TA98, TA100, TA102, TA 1535 and TA1537 strains of Salmonella (Ames test) with and without metabolic activation, and also in mouse lymphoma L5178Y cells by means of micronucleus and comet assays. In microbes the drug was tested at concentrations up to 500 \(\mu\)g/plate and in mouse lymphoma cells up to 2,000 \(\mu\)g/ml.
Results:
In both test-systems in all experiments completely negative results were obtained although FS-1 was tested at maximum tolerated doses.
Conclusions:
The drug is not genotoxic. This is advantageous because many antibacterial/antiviral drugs possess such activity.