Multiple mechanisms of ontogenic regulation of nuclear receptors during rat liver development

American Journal of Physiology. Gastrointestinal and Liver Physiology
N BalasubramaniyanM Ananthanarayanan

Abstract

Nuclear receptors (NRs) play pivotal roles in the regulation of genes contributing to hepatobiliary cholesterol and bile acid homeostasis. We have previously shown that transporters involved in bile formation are developmentally regulated and are poorly developed during the fetal stage, but their expression reached gradual maturity during the postnatal period. To define the molecular mechanisms underlying this regulation and the role that class II NRs and associated members [liver receptor homolog-1 (LRH-1) and short heterodimer partner (SHP)] play, we have analyzed the ontogeny of NR expression during liver development. Real-time PCR analysis of hepatic NR expression from fetal day 17 through adult revealed that steady-state mRNA levels for all NRs were very low during the embryonic period. However, mRNA levels peaked close to that of adult rats (>6 wk-old rats) by 4 wk of age for farnesoid X receptor (FXR), pregnane X receptor (PXR), liver X receptor-alpha (LXRalpha), peroxisome proliferator-activated receptor-alpha (PPARalpha), retinoid acid receptor-alpha (RARalpha), LRH-1, and SHP, whereas RXRalpha mRNA lagged behind. FXR, PXR, LXRalpha, RARalpha, and PPARalpha functional activity in liver nuclear extracts assayed by gel E...Continue Reading

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Jan 22, 2009·Pathology International·So TakegoshiMakoto Naito
Mar 27, 2012·Drug Metabolism and Disposition : the Biological Fate of Chemicals·Julia Yue CuiCurtis D Klaassen
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