Liver Receptor Homolog 1 Controls the Expression of Carboxyl Ester Lipase
pmid: 12853459
Liver Receptor Homolog 1 Controls the Expression of Carboxyl Ester Lipase
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.
Binding Sites, Base Sequence, Transcription, Genetic, Molecular Sequence Data, Restriction Mapping, Receptors, Cytoplasmic and Nuclear, Gene Expression Regulation, Enzymologic, Carboxylesterase, Sequence Homology, Nucleic Acid, [SDV.BBM.GTP] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN], Humans, RNA, Messenger, Promoter Regions, Genetic, Carboxylic Ester Hydrolases, Pancreas, Sequence Alignment
Binding Sites, Base Sequence, Transcription, Genetic, Molecular Sequence Data, Restriction Mapping, Receptors, Cytoplasmic and Nuclear, Gene Expression Regulation, Enzymologic, Carboxylesterase, Sequence Homology, Nucleic Acid, [SDV.BBM.GTP] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN], Humans, RNA, Messenger, Promoter Regions, Genetic, Carboxylic Ester Hydrolases, Pancreas, Sequence Alignment
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