Hormonal regulation of hepatic multidrug resistance-associated protein 2 (Abcc2) primarily involves the pattern of growth hormone secretion

American Journal of Physiology. Gastrointestinal and Liver Physiology
Francis R SimonEileen Sutherland

Abstract

Biliary excretion is the rate-limiting step in transfer of bilirubin, other organic anions, and xenobiotics across the liver. Multidrug resistance-associated protein 2 (Mrp2, Abcc2) is the major transporter for conjugated endo- and xenobiotic-conjugated compounds into bile. Hormones regulate bilirubin and xenobiotic secretion into bile, which have dimorphic differences. Therefore, we examined the possible role of sex steroids and growth hormone in the regulation of Mrp2. In approximately 8-wk-old rats, mRNA, transcriptional activity, and hepatic content of Mrp2 were selectively increased fourfold (P < 0.001) in females compared with males. In males, estrogens increased and testosterone decreased Mrp2 mRNA and protein, whereas no significant effect was measured in females, suggesting either a direct effect on the liver or an alteration in growth hormone secretory pattern. After hypophysectomy, Mrp2 mRNA was markedly reduced and the effects of estrogens and testosterone on Mrp2 were prevented, supporting the role of pituitary hormones in controlling Mrp2 expression. Mrp2 increased following growth hormone infusion in males. Mrp2 mRNA was decreased in growth hormone-deficient "Little" mice. Growth hormone infusions in hypophysecto...Continue Reading

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Citations

Jan 28, 2010·Pharmacological Reviews·Curtis D Klaassen, Lauren M Aleksunes
Mar 18, 2010·Drug Metabolism Reviews·Xinsheng Gu, Jose E Manautou
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Dec 29, 2019·Scientific Reports·Katarzyna J SiemienowiczMick T Rae
Sep 11, 2021·Life Sciences·Lucila I CeréViviana A Catania

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