Gene-by-Environment Interaction of Bcrp-/- and Methionine- and Choline-Deficient Diet-Induced Nonalcoholic Steatohepatitis Alters SN-38 Disposition.

Drug Metabolism and Disposition : the Biological Fate of Chemicals
Erica L TothNathan J Cherrington

Abstract

Disease progression to nonalcoholic steatohepatitis (NASH) has profound effects on the expression and function of drug-metabolizing enzymes and transporters, which provide a mechanistic basis for variable drug response. Breast cancer resistance protein (BCRP), a biliary efflux transporter, exhibits increased liver mRNA expression in NASH patients and preclinical NASH models, but the impact on function is unknown. It was shown that the transport capacity of multidrug resistance protein 2 (MRP2) is decreased in NASH. SN-38, the active irinotecan metabolite, is reported to be a substrate for Bcrp, whereas SN-38 glucuronide (SN-38G) is a Mrp2 substrate. The purpose of this study was to determine the function of Bcrp in NASH through alterations in the disposition of SN-38 and SN-38G in a Bcrp knockout (Bcrp-/- KO) and methionine- and choline-deficient (MCD) model of NASH. Sprague Dawley [wild-type (WT)] rats and Bcrp-/- rats were fed either a methionine- and choline-sufficient (control) or MCD diet for 8 weeks to induce NASH. SN-38 (10 mg/kg) was administered i.v., and blood and bile were collected for quantification by liquid chromatography-tandem mass spectrometry. In Bcrp-/- rats on the MCD diet, biliary efflux of SN-38 decreased...Continue Reading

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Citations

Aug 20, 2019·The Journal of Pharmacology and Experimental Therapeutics·Michelle L MontonyeJohn D Clarke
Dec 20, 2020·Expert Opinion on Drug Metabolism & Toxicology·Baron Bechtold, John Clarke

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