PPARα gene expression is up-regulated by LXR and PXR activators in the small intestine

LXR, PXR, and PPAR alpha are members of a nuclear receptor family which regulate the expression of genes involved in lipid metabolism. Here, we show the administration of T0901317 stimulates PPAR alpha gene expression in the small intestine but not in the liver of both normal and FXR-null mice. The administration of LXR specific ligand GW3965, or PXR specific ligand PCN has the same effect, indicating that ligand-dependent activation of LXR and PXR, but not FXR, is responsible for the increased gene expression of PPAR alpha in the mouse small intestine. (C) 2008 Elsevier Inc. All rights reserved.