6533b85dfe1ef96bd12bf2a9

RESEARCH PRODUCT

Role of hepatocyte nuclear factor 3γ in the expression of human CYP2C genes

M. José Gómez-lechónRoque BortJosé V. CastellRamiro Jover

subject

Transcriptional ActivationRecombinant Fusion ProteinsGenetic VectorsBiophysicsBiologyHydroxamic AcidsTransfectionBiochemistryGene Expression Regulation EnzymologicAdenoviridaeCytochrome P-450 Enzyme SystemSp3 transcription factorCell Line TumormedicineHumansRNA MessengerEnzyme InhibitorsLuciferasesPromoter Regions GeneticMolecular BiologyTranscription factorBinding SitesNuclear ProteinsPromoterMolecular biologyDNA-Binding ProteinsHistone Deacetylase InhibitorsHepatocyte nuclear factorsTrichostatin AHepatocyte nuclear factor 4Hepatocyte nuclear factor 4 alphaHepatocytesFOXA2Transcription Initiation SiteHepatocyte Nuclear Factor 3-gammaHeLa CellsTranscription Factorsmedicine.drug

description

Hepatocyte nuclear factor 3 gamma (HNF-3 gamma) is an important transcription factor for the maintenance of specific liver functions. However, its relevance in the expression of human cytochrome P450 (CYP) genes has not yet been explored. Several HNF3 putative binding sites can be identified in human CYP2C 5'-flanking regions. Gene reporter experiments with proximal promoters revealed that HNF-3 gamma transactivated CYP2C8, CYP2C9, and CYP2C19 (25-, 4-, and 4-fold, respectively), but it did not transactivate CYP2C18. However, overexpression of HNF-3 gamma in hepatoma cells by means of a recombinant adenovirus induced CYP2C9, CYP2C18, and CYP2C19 mRNA (4.5-, 20-, and 50-fold, respectively) but did not activate endogenous CYP2C8. The lack of effect of HNF-3 gamma on endogenous CYP2C8 could be reversed by treating cells with the deacetylase inhibitor, trichostatin A, suggesting the existence of chromatin condensation around functional HNF3 elements in this gene. We conclude that HNF3 gamma is an important transcription factor for the hepatic-specific expression of human CYP2C genes. Our results also evidence that efficient transfection tools, such as adenoviral vectors, may be decisive for assessing the role of transcription factor on chromatin organized genes.

yearjournalcountryeditionlanguage
2004-02-17Archives of Biochemistry and Biophysics
https://doi.org/10.1016/j.abb.2004.03.032