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• W88954364 abstract "The orphan nuclear receptors Pregnane X Receptor (PXR) and Constitutive Androstane Receptor (CAR) have been proposed to play an important role in the detoxification of xeno- and endobiotics by regulating the expression of detoxifying enzymes and transporters. We showed that the combined loss of PXR and CAR resulted in a significantly heightened sensitivity to bile acid toxicity in a sex-specific manner. The increased sensitivity in males was associated with genotype-specific suppression of bile acid transporters and loss of bile acid-mediated down regulation of small heterodimer partner, whereas the transporter suppression was modest or absent in the female DKO mice. The liver X receptors (LXRs), including the alpha and beta isoforms were identified as sterol sensors that regulate cholesterol and lipid homeostasis and macrophage functions. We found that activation of LXRƒN in transgenic mice or with LXR ligands confers a female-specific resistance to lithocholic acid (LCA)-induced hepatotoxicity and bile duct ligation (BDL)-induced cholestasis. In contrast, LXR alpha and beta double knockout mice (LXR DKO) exhibited heightened cholestatic sensitivity. The LCA and BDL resistance in transgenic mice was associated with an increased expression of bile acid detoxifying sulfotransferase 2A (SULT2A) and selected members of the bile acid transporters. We also showed that genetic or pharmacological activation of the orphan nuclear receptor liver X receptor (LXR) sensitized mice to cholesterol gallstone disease (CGD) induced by a high cholesterol lithogenic diet. LXR-promoted CGD was associated with increased expression of several canalicular transporters that efflux cholesterol and phospholipids, leading to higher biliary concentrations of cholesterol and phospholipids. The biliary bile salt concentration was reduced in these mice, resulting in increased cholesterol saturation index (CSI). Interestingly, the lithogenic effect of LXR was completely abolished in the low-density lipoprotein receptor (LDLR) null background or when the mice were treated with Ezetimibe, a cholesterol-lowering drug that blocks the intestinal dietary cholesterol absorption. We propose that LXRs have evolved to have dual function in maintaining cholesterol and bile acid homeostasis." @default.
• W88954364 created "2016-06-24" @default.
• W88954364 creator A5017033618 @default.
• W88954364 date "2007-04-05" @default.
• W88954364 modified "2023-09-23" @default.
• W88954364 title "REGULATORY NETWORKS OF PXR, CAR AND LXR IN CHOLESTEROL AND BILE ACID METABOLISM" @default.
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