title: On the control of the hCYP11B2 gene expressing cytochrome P450 aldosterone synthase.
abstract: We have previously reported that the protein kinase C ligand 12-O-tetradecanoyphorbol-13-acetate (TPA) inhibited the angiotensin II (AII) stimulated CYP11B2 gene expression in the adrenocortical H295R cell line. Here we report that TPA increased the level of phospho-p44/42 MAPK but AII did not. The MEK1 inhibitor PD98059 was found to increase the level of aldosterone synthase mRNA and the activity of a human CYP11B2(-2023 bp)-promoter construct. The cotransfection of H295R with ERK 1 and the hCYP11B2 promoter resulted in the inhibition of the promoter activity. TPA but not AII increased the level of the transcription factor JunB in nuclear extracts and the increase was partially abolished by the MEK1 inhibitor PD98059. The cotransfection of H295R with JunB and the hCYP11B2 promoter abolished the AII stimulating effect. Taken together these results suggest that TPA inhibits the AII-dependent activation of CYP11B2 via the p44/42 MAPK signaling pathway leading to an increase of the level of nuclear JunB.
authors.affiliation: Department of Biochemistry, Faculty of Medicine, University of Sherbrooke, Sherbrooke, Quebec, Canada. jean-guy.lehoux@usherbrooke.ca
authors.forename: Jean-Guy
authors.initials: JG
authors.lastname: LeHoux
authors.forename: Andrée
authors.initials: A
authors.lastname: Lefebvre
mesh_terms: D000804:Angiotensin II / Q000494:pharmacology; D045744:Cell Line, Tumor; D019405:Cytochrome P-450 CYP11B2 / Q000235:genetics* / Q000378:metabolism*; D005419:Flavonoids / Q000494:pharmacology; D005786:Gene Expression Regulation; D006801:Humans; D048369:MAP Kinase Kinase 1 / Q000037:antagonists & inhibitors; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D011401:Promoter Regions, Genetic / Q000187:drug effects; D016755:Proto-Oncogene Proteins c-jun / Q000378:metabolism / Q000494:pharmacology; D012333:RNA, Messenger / Q000378:metabolism; D015398:Signal Transduction / Q000502:physiology; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014162:Transfection
chemical_list: D005419:Flavonoids; D016755:Proto-Oncogene Proteins c-jun; D012333:RNA, Messenger; D000804:Angiotensin II; D019405:Cytochrome P-450 CYP11B2; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D048369:MAP Kinase Kinase 1; D013755:Tetradecanoylphorbol Acetate; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one