Liver receptor homolog 1 controls the expression of carboxyl ester lipase

J Biol Chem. 2003 Sep 12;278(37):35725-31. doi: 10.1074/jbc.M302370200. Epub 2003 Jul 9.

Abstract

The orphan nuclear receptor liver receptor homolog 1 (LRH-1) plays a central role in cholesterol homeostasis by regulating a number of hepatic and intestinal genes critical for reverse cholesterol transport and bile acid homeostasis. Herein, we describe the identification of carboxyl ester lipase (CEL) as a novel target of LRH-1 in pancreas, a tissue in which LRH-1 is abundantly expressed. In situ hybridization and gene expression studies demonstrate that both LRH-1 and CEL are co-expressed and confined to the exocrine pancreas. LRH-1 interacts with a consensus LRH-1 response element in the human CEL promoter, which is perfectly conserved in the rat gene, and induces CEL promoter activity in cotransfection assays. As reported for other LRH-1 target genes, the nuclear receptor short heterodimer partner represses LRH-1-induced CEL promoter activity. Chromatin immunoprecipitation demonstrates that binding of LRH-1 to the CEL promoter increases histone H4 acetylation corresponding with the activation of endogenous CEL gene transcription. Our data, identifying CEL as the first pancreatic LRH-1 target gene, indicate that LRH-1 is an important player in enterohepatic cholesterol homeostasis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Base Sequence
  • Binding Sites
  • Carboxylesterase
  • Carboxylic Ester Hydrolases / genetics*
  • Gene Expression Regulation, Enzymologic / physiology*
  • Humans
  • Molecular Sequence Data
  • Pancreas / enzymology
  • Pancreas / physiology*
  • Promoter Regions, Genetic
  • RNA, Messenger / genetics
  • Receptors, Cytoplasmic and Nuclear / genetics
  • Receptors, Cytoplasmic and Nuclear / physiology*
  • Restriction Mapping
  • Sequence Alignment
  • Sequence Homology, Nucleic Acid
  • Transcription, Genetic

Substances

  • Nr5a2 protein, mouse
  • RNA, Messenger
  • Receptors, Cytoplasmic and Nuclear
  • Carboxylic Ester Hydrolases
  • Carboxylesterase