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Clonidine is an agonist at alpha2-adrenergic receptors that mediate a wide variety of the physiological responses to epinephrine and norepinephrine, such as inhibition of neurotransmitter release as well as sedation and analgesia. As with other therapeutically used alpha2-agonists such as moxonidine and rilmenidine, clonidine possesses an imidazoline structure and is believed to lower blood pressure not only via central and peripheral alpha2-receptors, but perhaps even more so by acting on central “imidazoline I1 receptors” in the brain stem. The molecular structure of these hypothetical “imidazoline I1 receptors” has not yet been identified. In order to test whether ligands with an imidazoline structure elicit pharmacological effects via alpha2-adrenergic receptors or via “imidazoline receptors”, mice were generated with a targeted deletion of all three alpha2-adrenergic receptor subtypes (alpha2ABC-KO). These alpha2ABC-KO mice were an ideal model in which to examine the pharmacological effects of the centrally acting antihypertensives clonidine, moxonidine and rilmenidine in the absence of alpha2-adrenergic receptors. As expected, sedative and analgesic actions of clonidine were completely absent in alpha2ABC-KO mice, confirming the sole role of alpha2-receptors in these properties of clonidine. Clonidine significantly lowered heart rate in anesthetized alpha2ABC-KO and wild-type mice by up to 150 beats/min. A similar bradycardic effect of clonidine was observed in isolated spontaneously beating right atria from alpha2ABC-KO mice. After treatment with the specific If inhibitor ZD 7288, clonidine was no longer able to lower spontaneous beating frequency, suggesting a common site of action. Furthermore, in HEK293 cells stably transfected with HCN2 and HCN4, it could be shown that clonidine inhibits the If current via blockade of pacemaker channels with similar affinity as in isolated alpha2ABC-KO and wild-type atria. This inhibition was demonstrated again in isolated sinoatrial node (SAN) cells from alpha2ABC-KO mice and was identical in potency and efficacy to clonidine inhibition observed in isolated wild-type SAN cells, confirming that inhibition of atrial HCN channels constitutes the alpha2-independent bradycardic action of clonidine. Direct inhibition of cardiac HCN pacemaker channels contributes to the bradycardic effects of clonidine in gene-targeted mice. Thus clonidine-like drugs represent novel structures for future HCN channel inhibitors.
Insulin receptors were solubilized from rat liver microsomes by the nonionic detergent Triton X-100. After gel filtration of the extract on Sepharose CL-6B, two insulin-binding species (peak I and peak li) were obtained. The structure and binding properties of both peaks were characterized. Gel filtration yielded Stokes radii of 9.2 nm (peak I) and 8.0 nm (peak Il). Both peaks were glycoproteins. At 4°C peak 1 showed optimal insulin binding at pH 8.0 and high ionic strength. In contrast, peak li bad its binding optimum at pH 7.0 and low ionic strength, where peak I bindingwas minimal. For peak I the change in insulin binding under different conditions of pH and ionic strength was due to a change in receptor affinity only. For peak 11 an additional change in receptor number was found. Both peaks yielded non-linear Scatchard plots under most of the buffer conditions examined. At their binding optima at 4 oc the high affinity dissociation constants were 0.50 nM (peak I) and 0.55 nM (peak II). Sodium dodecyl sulfatejpolyacrylamide gel electrophoresis of peak I revealed five receptor bands with Mr 400000, 365000, 320000, 290000, and 245000 under non-reducing conditions. For peak II two major receptor bands with M\(_r\) 210000 and 115000 were found. The peak II receptor bands were also obtained aftermild reduction of peak I. After complete reduction both peaks showed one major receptor band with M\(_r\) 130000. The reductive generation of the peak II receptor together with molecular mass estimations suggest that the peak I receptor is the disulfide-linked dimer of the peak II receptor. Thus, Triton extracts from rat liver microsomes contain two receptor species, which are related, but differ considerably in their size and insulin-binding properties.
Hormones are essential components in the body and their imbalance leads to pathological consequences. T2DM, insulin resistance and obesity are the most commonly occurring lifestyle diseases in the past decade. Also, an increased cancer incidence has been strongly associated with obese and T2DM patients.
Therefore, our aim was to study the influence of high insulin levels in accumulating DNA damage in in vitro models and patients, through the induction of oxidative stress. The primary goal of this study was to analyze the genotoxicity induced by the combined action of two endogenous hormones (insulin and adrenaline) with in vitro models, through the induction of micronuclei and to see if they cause an additive increase in genomic damage. This is important for multifactorial diseases having high levels of more than one hormone, such as metabolic syndrome and conditions with multiple pathologies (e.g., T2DM along with high stress levels).
Furthermore, the combination of insulin and the pharmacological inhibition of the tumor suppressor gene: PTEN, was to be tested in in vitro models for their genotoxic effect and oxidative stress inducing potential. As the tumor suppressor gene: PTEN is downregulated in PTEN associated syndromes and when presented along with T2DM and insulin resistance, this may increase the potential to accumulate genomic damage.
The consequences of insulin action were to be further elucidated by following GFP-expressing cells in live cell-imaging to observe the ability of insulin, to induce micronuclei and replicative stress. Finally, the detrimental potential of high insulin levels in obese patients with hyperinsulinemia and pre-diabetes was to be studied by analyzing markers of oxidative stress and genomic damage. In summary, the intention of this work was to understand the effects of high insulin levels in in vitro and in patients to understand its relevance for the development of genomic instability and thus an elevated cancer risk.
Cyclisches Adenosinmonophosphat ist ein ubiquitärer zweiter Botenstoff zahlreicher Signalwege im menschlichen Körper. Auf eine Vielzahl verschiedenster extrazellulärer Signale folgt jedoch eine Erhöhung desselben intrazellulären Botenstoffs - cAMP. Nichtsdestotrotz schafft es die Zelle, Signalspezifität aufrecht zu erhalten. Ein anerkanntes, wenn auch bisher unverstandenes Modell, um dieses zu ermöglichen, ist das Prinzip der Kompartimentierung. Die Zelle besitzt demnach Areale verschieden hoher cAMP-Konzentrationen, welche lokal begrenzt einzelne Signalkaskaden beeinflussen und somit eine differenzierte Signalübertragung ermöglichen. Eine mögliche Ursache für die Ausbildung solcher Bereiche geringerer cAMP- Konzentrationen (hier als Domänen bezeichnet), ist die hydrolytische Aktivität von Phosphodiesterasen (PDEs), welche als einzige Enzyme die Fähigkeiten besitzen, cAMP zu degradieren.
In dieser Arbeit wird der Einfluss der cAMP-Hydrolyse verschiedener PDEs auf die Größe dieser Domänen evaluiert und mit denen der PDE4A1 verglichen, welche bereits durch unsere Arbeitsgruppe aufgrund ihrer Größe als Nanodomänen definiert wurden. Der Fokus wird dabei auf den Einfluss von kinetischen Eigenschaften der Phosphodiesterasen gelegt. So werden eine PDE mit hoher Umsatzgeschwindigkeit (PDE2A3) und eine PDE mit hoher Substrataffinität (PDE8A1) verglichen. Mithilfe sogenannter Linker, Abstandshaltern definierter Länge, werden zusätzlich die Nanodomänen ausgemessen, um einen direkten Zusammenhang zwischen Größe und kinetischer Eigenschaft anzugeben. Die Zusammenschau der Ergebnisse zeigt, dass die maximale Umsatzgeschwindigkeit der Phosphodiesterasen direkt mit der Größe der Nanodomänen korreliert.
Durch den unmittelbaren Vergleich der gesamten PDE mit ihrer katalytischen Domäne wird zusätzlich der Einfluss von regulatorischen Domänen evaluiert. Es wird gezeigt, dass diese cAMP-Gradienten modulieren können. Bei der PDE2A3 geschieht die Modulation u.a. durch Stimulation mit cGMP, welche höchstwahrscheinlich dosisabhängig ist und somit graduell verläuft. Hiermit präsentieren sich die Domänen als dynamische Bereiche, d.h. sie können in ihrer Ausprägung reguliert werden. In dieser Arbeit wird die Hypothese bestätigt, dass Phosphodiesterasen eine wichtige Rolle in der Kompartimentierung von cAMP spielen, die Gruppe jedoch inhomogener ist, als bislang angenommen. Die Gradienten-Bildung lässt sich nicht bei jeder Phosphodiesterase darstellen (PDE8A1). Einige Phosphodiesterasen (PDE2A3) jedoch bilden Kompartimente, die durch externe Stimuli in ihrer Größe reguliert werden können.
Die Arbeit legt den Grundstein zur breiteren Charakterisierung des spezifischen Einflusses weiterer PDEs auf cAMP-Kompartimentierung, welches nicht nur das Verständnis der Kompartimentierungs-Strategien voranbringt, sondern auch essentiell für das Verständnis der Pathophysiologie zahlreicher Krankheitsbilder, aber auch für das Verständnis bereits angewandter aber auch potentiell neuer Medikamente ist.
The widely used chemical acrylamide (AA) has been classified as a probable human carcinogen. This classification was based on positive results in rodent carcinogenicity studies as well as on a number of in vitro mutagenicity assays. In 2002, AA was discovered to be formed during the preparation of starch-containing foods. According to the latest FDA exposure assessment (2006), the average daily intake has been estimated from AA levels in foodstuffs and from nutritional habits to be around 0.4 µg/kg b.w. with a 90th percentile of 0.95 µg/kg b.w.. In children and adolescents however, the daily AA intake is about 1.5 times higher, due to lower body weight and differing consumption patterns. Apart from the diet, humans may be exposed to AA during the production or handling of monomeric AA, from AA residues in polyacrylamides, and from cigarette smoke. After oral administration, AA is readily absorbed and distributed throughout the organism. AA is metabolized to the reactive epoxide glycidamide (GA) via the CYP 450 isoenzyme CYP 2E1. Both, AA and GA are conjugated with glutathione. After enzymatic processing, the mercapturic acids N-Acetyl-S-(2-carbamoylethyl)-L-cysteine (AAMA) as well as the regioisomers N-Acetyl-S-(2-carbamoyl-2-hydroxyethyl)-L-cysteine (GAMA) and N-Acetyl-S-(1-carbamoyl-2-hydroxy-ethyl)-L-cysteine (iso-GAMA) are excreted with urine. An additional pathway for the metabolic conversion of GA is the epoxide hydrolase mediated hydrolysis to the diol compound glyceramide. Following administration of AA at doses exceeding the daily dietary intake by a factor of 1000 - 6000 to human subjects, a new urinary metabolite was found, which could be identified as the S-oxide of AAMA (AAMA-sulfoxide). In general, data from animal studies are used for risk assessment of (potential) human carcinogens. However, inter-species differences in toxicodynamics or toxicokinetics, e.g. in biotransformation may lead to under- or overestimation of human risk. The objective of this work was to establish a highly specific and sensitive analytical method to quantify the major urinary metabolites of AA. Other aims apart from measurements concerning the human background exposure were the evaluation of biotransformation and toxicokinetics of AA in humans and rats after oral administration of 13C3-AA. The obtained data was intended to help avoid linear extrapolation from animal models for future risk assessments of AA carcinogenicity.
Recently, it was shown that MDA-MB-231 breast cancer cells express very high levels of the A2BAR as the sole adenosine receptor subtype, and stimulation of the A2BAR in MDA-MB-231 cells triggers an unusual inhibitory signal on ERK1/2 phosphorylation. The ERK1/2 pathway is reported to be associated with the control of growth, proliferation and differentiation of cells and as such might serve as a promising target for tumor treatment. The present study investigated signaling mechanisms involved in linking A2BAR to ERK1/2 phosphorylation in MDA-MB-231 cells. The A2BAR mediated reduction of ERK1/2 phosphorylation and of proliferation of MDA-MB-231 cell is in good agreement with previous results from (Dubey et al., 2005). These observations provide support to the hypothesis that activation of A2BAR could attenuate the growth of some types of cancer cell and argue against a stimulation of proliferation resulting from the activation of A2BAR as discussed by (Fernandez-Gallardo et al., 2016). AC activation by forskolin has recently been shown to enhance the activity of the chemotherapeutic agent doxorubicin in TNBC cells via a mechanism dependent on the PKA-mediated inhibition of ERK1/2 phosphorylation. Furthermore, forskolin also increased the sensitivity of MDA-MB-231 and MDA-MB-468 triple negative breast cancer cells to 5-fluorouracil and taxol (Illiano et al., 2018), and sustains the evidence of anticancer activity mediated by cAMP/PKA-mediated ERK1/2 inhibition. Similar to these studies, a reduced amount of pERK1/2 was also observed after stimulation of AC with FSK, application of cAMP-AM or inhibition of PDE-4. The inhibition of ERK1/2 phosphorylation was mimicked by UTP and abolished with the PLC inhibitor U73122 or by chelating intracellular Ca2+ with BAPTA-AM. These results point to an important role for both cAMP and Ca2+ signaling in the pathway leading to a decrease in ERK1/2 phosphorylation. This study encourages the idea that A2BAR could be used as target in cancer therapy. But A2BAR did not only stimulate signaling cascades associated with cell survival and proliferation reduction, but also key phases relevant in angiogenesis like Ca2+ mobilization (Kohn et al., 1995). Whereas the potency toward AC and Ca2+ are similar for the diverse agonists, the potency to promote ERK1/2 reduction is much higher. Interestingly, the proliferation of MDA-MB-231 cells is inhibited by low nanomolar agonist concentration which is inactive in Ca2+ mobilization. This means that it is certainly possible to reduce the proliferation without promoting angiogenesis. LUF6210 is particularly interesting when considering that it preferentially stimulates a reduction in ERK1/2 phosphorylation over Ca2+ and therefore may not promote angiogenesis. LUF6210 is therapeutically appealing as adjuvant in treatment of cancer. Given that stimulation of AC can activate a reduction of ERK1/2 phosphorylation and proliferation in cancer cells, agonist bias toward Gs-AC-PKA-mediated ERK1/2 inhibition represent a potential therapy of various malignancies. The fact that the reduction of ERK1/2 phosphorylation followed by reduced proliferation observed in MDA-MB-231 cells were mediated by the activation of the A2BAR illustrates the importance of this receptor subtype in cancer. A2BARs must be considered as a key factor in cancer treatment and deserve attention for the development of new therapeutic strategies.
Die extrazellulär Signal-regulierten Kinasen 1 und 2 (ERK1/2) spielen eine zentrale Rolle bei der Vermittlung kardialer Hypertrophie und dem Zellüberleben. Hypertrophe Stimuli aktivieren ERK1/2, triggern deren Dimerisierung und in der Folge die ERK188-Autophosphorylierung. Diese neu entdeckte Autophosphorylierung ist eine Voraussetzung für den nukleären Import von ERK1/2 und führt zum Entstehen pathologischer kardialer Hypertrophie. Da das Dimer Interface von ERK eine mögliche Zielstruktur darstellt, um selektiv die nukleären Signalwege von ERK zu unterbrechen, wurde untersucht, ob man mit Hemmung der ERK-Dimerisierung eine therapeutische Möglichkeit hat, um pathologische kardiale Hypertrophie zu verhindern. Dazu wurden verschiedene ERK2 Mutanten und Peptide generiert, um die ERK-Dimerisierung zu verhindern. Die Effekte dieser Konstrukte auf die ERK-Dimerisierung und den Kernimport wurden in verschiedenen Zelltypen mittels Fluoreszenzmikroskopie, Co-Immunopräzipitationen und Duolink proximity ligation assays getestet. Es konnte gezeigt werden, dass die Peptide effektiv die ERK-ERK Interaktion nach Stimulation mit Phenylephrin und/oder Carbachol verhindern. Zusätzlich reduzierten die Peptide ERKT188-Phosphorylierung und in der Folge den ERK-Import in den Nukleus und Kardiomyozytenhypertrophie. Normale ERK-Aktivierung wurde jedoch durch die Peptide nicht verhindert. Insgesamt konnte gezeigt werden, dass das ERK-Dimer Interface eine wertvolle Zielstruktur ist, mit dem man nukleäre ERK1/2 Signalwege selektiv unterbrechen und damit effektiv Kardiomyozytenwachstum reduzieren kann, ohne gleichzeitig das Zellüberleben zu gefährden.
Patienten mit arterieller Hypertonie haben ein erhöhtes Risiko eine Tumorerkrankung, insbesondere Nierenzellkarzinome, zu entwickeln. Die arterielle Hypertonie ist über die Entstehung von oxidativem Stress mit der Entwicklung von DNA-Schäden verknüpft, wobei ein hochreguliertes Renin-Angiotensin-Aldosteron-System (RAAS) eine entscheidende Rolle einnimmt. Das Ziel dieser Arbeit war es zum einen Hypertoniker (HypAll) und gesunde Kontrollen und zum anderen gut (HypGut) und schlecht (HypSch) eingestellte Hypertoniker unter Berücksichtigung der eingenommenen Antihypertensiva bezüglich ihrer Level an oxidativem Stress und DNA-Schäden zu vergleichen. Zusätzlich erfolgte im Rahmen einer Längsschnittanalyse der intraindividuelle Vergleich unter den Hypertonikern. Hierfür erfolgte die Bestimmung von SHp, D-ROM und 3-Nitrotyrosin als Marker für oxidativen Stress im Plasma, von 8-oxodG, 15-F2t-Isoprostan und Malondialdehyd als Marker für oxidativen Stress im Urin und von γ-H2AX und Mikrokernen als Marker für DNA-Schäden in Lymphozyten.
Dabei konnte ein erhöhter oxidativer Stress in der HypAll-Gruppe verglichen zu den Kontrollen anhand aller Marker für oxidativen Stress mit Ausnahme von Malondialdehyd festgestellt werden. Nach Altersadjustierung zeigte sich dieser Gruppenunterschied nur noch für die Proteinstressmarker SHp und 3-Nitrotyrosin signifikant. Bezüglich der Marker für DNA-Schäden ergab sich kein Unterschied zwischen HypAll und Kontrollen. Ebenso zeigte sich kein signifikanter Unterschied in den Leveln für oxidativen Stress und DNA-Schäden zwischen der HypGut- und HypSch-Gruppe. Zuletzt konnte im Rahmen der Längsschnittstudie ein positiver Zusammenhang zwischen der Entwicklung des Blutdrucks und des oxidativen Stresses anhand der Veränderung von D-ROM und des systolischen Blutdrucks beobachtet werden.
Die teils nicht-signifikanten und teils mangelnden Unterschiede zwischen HypAll und Kontrollen sowie zwischen HypGut und HypSch sind am ehesten durch das besondere Patientengut, welches sich auch grundlegend von dem anderer vergleichbarer Studien unterscheidet, erklärbar. Die Patienten mit therapieresistenter Hypertonie (TRH) zeichnen sich durch eine langjährige Einnahme zahlreicher Antihypertensiva aus. Diese, insbesondere die RAAS-wirksamen, besitzen eine über die reine Blutdrucksenkung hinausgehende antioxidative und antigenotoxische Wirkung, welche vermutlich zu einer Angleichung der Level für oxidativen Stress und DNA-Schäden geführt hat.
Um die Dynamik der Biomarker und den Einfluss der Antihypertensiva auf oxidativen Stress und DNA-Schäden besser zu verstehen, sind weitere Studien über einen längeren Beobachtungszeitraum sowie mit zusätzlich therapienaiven Hypertonikern sinnvoll. Die weitere Erforschung von Biomarkern, um sie im klinischen Alltag zur Verbesserung der Patientenbehandlung einsetzen zu können, ist notwendig.
Various substituted aniline derivatives were tested for genotoxicity in several short-term tests in order to examine the hypothesis that a Substitution at both ortho positions (2,6-disubstitution) could prevent genotoxicity due to steric hindrance of an enzymatic activation to electrophilic intermediates. In the Salmonellajmicrosome assay, 2,6-dialkylsubstituted anilines and 2,4,6-trimethylaniline (2,4,6-TMA) were weakly mutagenic in strain TA100 when 20% S9 mixwas used, although effects were small compared to those of 2,4-dimethylaniline and 2,4,5-trimethylaniline (2,4,5-TMA). In Drosophila me/anogaster, however, 2,4,6-TMA and 2,4,6-trichloroaniline (TCA) were mutagenic in the wing spottestat 2-3 times lower doses than 2,4,5-TMA. In the 6-thioguanine resistance test in cultured fibroblasts, 2,4,6-TMA was again mutagenic at lower doses than 2,4,5-TMA. Two methylene-bis-aniline derivatives were also tested with the above methods: 4,4'-methylene-bis-(2-chloroaniline) (MOCA) was moderately genotoxic in al1 3 test systems whereas 4,4'-methylene-bis-(2-ethyl-6-methylaniline) (MMEA) showed no genotoxicity at all. DNA binding sturlies in rats, however, revealed that both MOCA and MMEA produced DNA adducts in the liver at Ievels typically found for moderately strong genotoxic carcinogens. These results indicate that the predictive value of the in vitro test systems and particularly the Salmonellajmicrosome assay is inadequate to detect genotoxicity in aromatic amines. Genotoxicity seems to be a general property of aniline derivatives and does not seem to be greatly influenced by substitution at both ortho positions.
Attention-deficit/hyperactivity disorder (ADHD) is the most frequent psychiatric disorder in children and adolescents and is often treated with methylphenidate (MPH), resulting in MPH exposure in more than 1% of all children in many countries. A 2005 report on cytogenetic effects in peripheral lymphocytes from 12 ADHD children treated for 3 months with MPH raised questions about its genetic toxicity and potential carcinogenicity. A healthy control group (23 individuals), a chronically MPH-treated (>12 months) group (21 patients), and a drug naïve group of ADHD-affected children (26 patients), which was analyzed again after 3 months (17 patients) and 6 months (11 patients), provided samples for analysis of micronucleated lymphocytes. No significant alteration in genomic damage as seen as micronucleus frequency in peripheral lypmphocytes was detected after MPH treatment. No indication for genomic damage induced by MPH was obtained in this study. Ongoing studies in the USA, as well as continuation of recently published epidemiological cancer incidence analysis should provide additional reassurance for MPH-treated ADHD patients.