Original title: Vliv vybraných endokrinních disruptorů na cytochromy P450 1B1 a 3A1/2
Translated title: The effect of selected endocrine disruptors on cytochromes P450 1B1 and 3A1/2
Authors: Holecová, Jana ; Bořek Dohalská, Lucie (advisor) ; Cajthaml, Tomáš (referee)
Document type: Master’s theses
Year: 2017
Language: cze
Abstract: [cze] [eng]
Mnoho látek exogenního nebo endogenního původu působí jako endokrinní disruptory (EDC), tedy interferují s přirozenou tvorbou, signalizací nebo metabolismem hormonů v organismu. Mezi rozšířené endokrinní disruptory exogenního původu patří benzo(a)pyren (BaP) a 17α-ethinylestradiol (EE2), hojně se v prostředí vyskytuje také endogenní endokrinní disruptor 17β-estradiol (E2). V rámci této diplomové práce byl studován vliv uvedených EDC a jejich kombinací na genovou a proteinovou expresi CYP1B1, 3A1 a 3A2 v játrech, ledvinách a plicích potkanů in vivo. Proteinová exprese byla sledována za použití metody Western blot a specifických protilátek, genová exprese byla sledována pomocí kvantitativní PCR. Dále byl sledován vliv těchto látek na metabolismus benzo(a)pyrenu a na specifickou aktivitu CYP3A (stanovenou jako rychlost tvorby 6β-hydroxytestosteronu) v mikrosomální frakci izolované z jater potkanů. Bylo potvrzeno, že BaP výrazně indukuje expresi CYP1B1 v játrech a plicích jak samostatně, tak v kombinaci s EE2 nebo E2. Premedikace potkanů estradiolem spolu s BaP indukci CYP1B1 BaP ještě posiluje. Naopak premedikace potkanů EE2, E2 nebo jejich kombinací genovou expresi tohoto enzymu snižuje. U potkanů premedikovaných BaP nebo jeho kombinacemi dochází ke zvýšené tvorbě metabolitů BaP v jaterní... Many exogenous and endogenous compounds are referred to as endocrine disruptors (EDCs), as they interfere with natural synthesis, signaling and metabolism of endogenous hormones. Common exogenous endocrine disruptors are benzo(a)pyrene (BaP) and 17α-ethinylestradiol (EE2). Endogenous endocrine disruptor 17β-estradiol (E2) is frequently present in the environment as well. In this thesis, the effect of the mentioned EDCs and their combinations on gene and protein expression of CYP1B1, 3A1 and 3A2 in rat liver, kidney and lung was determined. Protein expression was studied using Western blot method and specific antibodies; gene expression was assessed by quantitative PCR. Moreover, the effect of tested EDCs and their combinations on BaP metabolism and CYP3A specific activity (measured as testosterone 6β-hydroxylation) were studied in liver microsomal samples. It was confirmed, that BaP significantly increases CYP1B1 expression in rat liver and lung both alone and together with EE2 or E2. Pretreatment of rat with E2 and BaP increases the ability of BaP to induce CYP1B1 expression. On the contrary, EE2, E2 and their combination decrease the CYP1B1gene expression. The rate of BaP metabolites formed in liver microsomal samples increases in rats pretreated with BaP and its combinations. In liver, there was...
Keywords: 17α-ethinylestradiol; 17β-estradiol; benzo(a)pyrene; cytochrome P450; endocrine disruptors; expression; 17α-ethinylestradiol; 17β-estradiol; benzo(a)pyren; cytochrom P450; endokrinní disruptory; exprese

Institution: Charles University Faculties (theses) (web)
Document availability information: Available in the Charles University Digital Repository.
Original record: http://hdl.handle.net/20.500.11956/90515

Permalink: http://www.nusl.cz/ntk/nusl-365115


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Universities and colleges > Public universities > Charles University > Charles University Faculties (theses)
Academic theses (ETDs) > Master’s theses