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Interactions of resveratrol derivatives with PXR receptor
Marešová, Veronika ; Pávek, Petr (advisor) ; Trejtnar, František (referee)
Charles University in Prague Department of Pharmacology & Toxicology Student: Supervisor: Prof Title of diploma thesis: Interactions of resveratrol derivatives with PXR receptor Derivatives of resveratrol belong between natural substances contained mainly in red wine and grapefruit. These compounds with stilbene-like structure show antioxidant activity. Pregnane X receptor (PXR) regulates expression of the most important biotransformation enzymes in human liver and intestine including cytochrome P450 3A4 (CYP3A4). Interaction of resveratrol and PXR have already been studied, but published data are contradictory. In my diploma thesis, I studied interaction of resveratrol and its derivatives with PXR. For this purpose, gene reporter assay with quantitative real-time polymerase chain reaction (qRT-PCR) was introduced. It was not possible to conduct experiments in standard way because both resveratrol and its derivatives inhibit lusiferase activities. I studied also effects of resveratrol and its derivatives on expression of CYP3A4 mRNA on differentiated HepaRG cell line. New method gene reporter method with qRT-PCR detection of luciferase was established on hepatoma cell line HepG2 transfected with CYP3A4 reporter construct. Concertation dependent effects of resveratrol and its derivatives were...
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Molecular mechanisms of interactions- interactions of constitutive androstane receptor with selected stilbene compounds
Linhartová, Lenka ; Pávek, Petr (advisor) ; Smutná, Lucie (referee)
Charles University Faculty of Pharmacy in Hradec Králové Department of Pharmacology & Toxicology Student: Lenka Linhartová Supervisor: Prof. PharmDr. Petr Pávek, Ph.D. Title of diploma thesis: Molecular mechanisms of intractions - interactions of constitutive androstane receptor with selected stilbene compounds Constitutive androstane receptor (CAR), member of nuclear receptors family, is a major regulator of gene expression of phase I and II enzymes metabolizing endobiotics and xenobiotics. Changes in its activity can lead to pharmacokinetic drug interactions, ineffective treatment or higher toxicity of drugs simultaneously administered with CAR ligands. Recently another effects of this receptor, especially in homeostasis of bile acids, lipids and glucose have been discovered and CAR is now considered as a potential drug target for the treatment of metabolic diseases. Stilbenes represent a small group of plant polyphenols with typical 1,2-diphenylethylene nucleus. The most famous member is resveratrol, which has attracted great attention thanks to its antioxidant, anti-inflammatory, antiproliferative and cardioprotective effects. Others stilbene compounds such as pterostilben, piceatannol or pinosylvin have shown similar health beneficial effects as well. The aim of this diploma thesis was...
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Inhibitory effect of SPA70 on hPXR activation
Dohnalová, Klára ; Pávek, Petr (advisor) ; Červený, Lukáš (referee)
Charles University Faculty of Pharmacy in Hradec Králové Department of Pharmacology & Toxicology Student: Klára Dohnalová Supervisor: prof. PharmDr. Petr Pávek, Ph.D. Title of diploma thesis: Inhibitory effect of SPA70 on hPXR activation This work focuses on pregnane X receptor (PXR) and its antagonists. PXR is a ligand-activated nuclear receptor that plays a major role in detoxification of xenobiotics and protecting the organism from their toxic effects. Recent evidence also shows endogenous action of PXR in the metabolism of lipids, glucose and bile acids. However, PXR activation could be harmful, since induction of biotransformation enzymes by PXR agonists may result in reduced treatment efficacy, increased toxicity of drug metabolites and resistance to chemotherapeutic agents. Recent research has been intensively focused on PXR antagonists capable of abolishing these unfavourable effects. Recently discovered human PXR antagonist SPA70 has a promising potential for future usage. In this study, we investigated the inhibitory effect of SPA70 on activated PXR. To activate PXR we used agonists binding directly to PXR (rifampicin, hyperforin, SR12813) and also agonists activating PXR indirectly via cell signalling pathways (U0126, PD184352, PD0325901). Experiments were performed using luciferase...
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Interactions of resveratrol derivatives with PXR receptor
Marešová, Veronika ; Pávek, Petr (advisor) ; Trejtnar, František (referee)
Charles University in Prague Department of Pharmacology & Toxicology Student: Supervisor: Prof Title of diploma thesis: Interactions of resveratrol derivatives with PXR receptor Derivatives of resveratrol belong between natural substances contained mainly in red wine and grapefruit. These compounds with stilbene-like structure show antioxidant activity. Pregnane X receptor (PXR) regulates expression of the most important biotransformation enzymes in human liver and intestine including cytochrome P450 3A4 (CYP3A4). Interaction of resveratrol and PXR have already been studied, but published data are contradictory. In my diploma thesis, I studied interaction of resveratrol and its derivatives with PXR. For this purpose, gene reporter assay with quantitative real-time polymerase chain reaction (qRT-PCR) was introduced. It was not possible to conduct experiments in standard way because both resveratrol and its derivatives inhibit lusiferase activities. I studied also effects of resveratrol and its derivatives on expression of CYP3A4 mRNA on differentiated HepaRG cell line. New method gene reporter method with qRT-PCR detection of luciferase was established on hepatoma cell line HepG2 transfected with CYP3A4 reporter construct. Concertation dependent effects of resveratrol and its derivatives were...
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Molecular mechanisms of interactions- interactions of constitutive androstane receptor with selected stilbene compounds
Linhartová, Lenka ; Pávek, Petr (advisor) ; Smutná, Lucie (referee)
Charles University Faculty of Pharmacy in Hradec Králové Department of Pharmacology & Toxicology Student: Lenka Linhartová Supervisor: Prof. PharmDr. Petr Pávek, Ph.D. Title of diploma thesis: Molecular mechanisms of intractions - interactions of constitutive androstane receptor with selected stilbene compounds Constitutive androstane receptor (CAR), member of nuclear receptors family, is a major regulator of gene expression of phase I and II enzymes metabolizing endobiotics and xenobiotics. Changes in its activity can lead to pharmacokinetic drug interactions, ineffective treatment or higher toxicity of drugs simultaneously administered with CAR ligands. Recently another effects of this receptor, especially in homeostasis of bile acids, lipids and glucose have been discovered and CAR is now considered as a potential drug target for the treatment of metabolic diseases. Stilbenes represent a small group of plant polyphenols with typical 1,2-diphenylethylene nucleus. The most famous member is resveratrol, which has attracted great attention thanks to its antioxidant, anti-inflammatory, antiproliferative and cardioprotective effects. Others stilbene compounds such as pterostilben, piceatannol or pinosylvin have shown similar health beneficial effects as well. The aim of this diploma thesis was...
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Molecular mechanisms of interactions- interactions of constitutive androstane receptor with selected stilbene compounds
Linhartová, Lenka ; Pávek, Petr (advisor) ; Hyršová, Lucie (referee)
Charles University Faculty of Pharmacy in Hradec Králové Department of Pharmacology & Toxicology Student: Lenka Linhartová Supervisor: Prof. PharmDr. Petr Pávek, Ph.D. Title of diploma thesis: Molecular mechanisms of intractions - interactions of constitutive androstane receptor with selected stilbene compounds Constitutive androstane receptor (CAR), member of nuclear receptors family, is a major regulator of gene expression of phase I and II enzymes metabolizing endobiotics and xenobiotics. Changes in its activity can lead to pharmacokinetic drug interactions, ineffective treatment or higher toxicity of drugs simultaneously administered with CAR ligands. Recently another effects of this receptor, especially in homeostasis of bile acids, lipids and glucose have been discovered and CAR is now considered as a potential drug target for the treatment of metabolic diseases. Stilbenes represent a small group of plant polyphenols with typical 1,2-diphenylethylene nucleus. The most famous member is resveratrol, which has attracted great attention thanks to its antioxidant, anti-inflammatory, antiproliferative and cardioprotective effects. Others stilbene compounds such as pterostilben, piceatannol or pinosylvin have shown similar health beneficial effects as well. The aim of this diploma thesis was...
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Inhibitory effect of SPA70 on hPXR activation
Dohnalová, Klára ; Pávek, Petr (advisor) ; Červený, Lukáš (referee)
Charles University Faculty of Pharmacy in Hradec Králové Department of Pharmacology & Toxicology Student: Klára Dohnalová Supervisor: prof. PharmDr. Petr Pávek, Ph.D. Title of diploma thesis: Inhibitory effect of SPA70 on hPXR activation This work focuses on pregnane X receptor (PXR) and its antagonists. PXR is a ligand-activated nuclear receptor that plays a major role in detoxification of xenobiotics and protecting the organism from their toxic effects. Recent evidence also shows endogenous action of PXR in the metabolism of lipids, glucose and bile acids. However, PXR activation could be harmful, since induction of biotransformation enzymes by PXR agonists may result in reduced treatment efficacy, increased toxicity of drug metabolites and resistance to chemotherapeutic agents. Recent research has been intensively focused on PXR antagonists capable of abolishing these unfavourable effects. Recently discovered human PXR antagonist SPA70 has a promising potential for future usage. In this study, we investigated the inhibitory effect of SPA70 on activated PXR. To activate PXR we used agonists binding directly to PXR (rifampicin, hyperforin, SR12813) and also agonists activating PXR indirectly via cell signalling pathways (U0126, PD184352, PD0325901). Experiments were performed using luciferase...
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