Temporal pattern of the induction of SF-1 gene expression by the signal transduction pathway involving 3',5'-cyclic adenosine monophosphate.
The objective of our study was to investigate the effect of stimulation of the cAMP-dependent pathway on the expression of an orphan nuclear receptor, SF-1/Ad4BP in mouse adrenal tumour, Y-1 cells in culture. We evaluated the temporal pattern of the effects of corticotropin (ACTH) and the adenylyl cyclase activator forskolin on the level of SF-1 mRNA, and compared the time course of induction of SF-1 with that of CYP11A1. Forskolin, corticotropin and 8-Br-cAMP significantly elevated the level of the SF-1 transcript, after 1.5 h of incubation, with a concomitant increase of SF-1 protein level, observed after 6 h. The CYP11A1 transcript increased gradually over the incubation period, and reached the maximal level after 12 to 24 h. The steady-state level of the SF-1 transcript was unaffected by forskolin when the cells were incubated with actinomycin D, indicating that stimulation of the cAMP pathway results in enhanced transcription of the gene. The effect of forskolin was augmented by cycloheximide, suggesting that an inhibitory protein, whose synthesis was inhibited by cycloheximide, could be involved in negative regulation of SF-1 expression. It is concluded that SF-1 expression is positively regulated by the cAMP pathway at the transcriptional level, and can represent the primary event in cAMP-mediated induction of steroid hormone synthesis in Y-1 cells.
Lehmann
Tomasz P
TP
Department of Biochemistry and Molecular Biology, University of Medical Sciences, Poznań, Poland.
Biernacka-Łukanty
Justyna M
JM
Saraco
Nora
N
Langlois
Dominique
D
Li
Jacques Y
JY
Trzeciak
Wiesław H
WH
D000324:Adrenocorticotropic Hormone / Q000494:pharmacology; D000818:Animals; D015152:Blotting, Northern; D015153:Blotting, Western; D050882:CREB-Binding Protein / Q000235:genetics; D045744:Cell Line, Tumor; D002786:Cholesterol Side-Chain Cleavage Enzyme / Q000235:genetics; D005576:Colforsin / Q000494:pharmacology; D000242:Cyclic AMP / Q000378:metabolism*; D003513:Cycloheximide / Q000494:pharmacology; D003609:Dactinomycin / Q000494:pharmacology; D051548:Histone Acetyltransferases / Q000235:genetics; D051379:Mice; D056920:Nuclear Receptor Coactivator 1; D010750:Phosphoproteins / Q000235:genetics; D015398:Signal Transduction / Q000187:drug effects; D054339:Steroidogenic Factor 1 / Q000235:genetics* / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics; D000098682:Steroidogenic Acute Regulatory Protein
D010750:Phosphoproteins; D054339:Steroidogenic Factor 1; D014157:Transcription Factors; D000098682:Steroidogenic Acute Regulatory Protein; D003609:Dactinomycin; D005576:Colforsin; D000324:Adrenocorticotropic Hormone; D003513:Cycloheximide; D000242:Cyclic AMP; D002786:Cholesterol Side-Chain Cleavage Enzyme; D050882:CREB-Binding Protein; C494364:Crebbp protein, mouse; D051548:Histone Acetyltransferases; C538861:Ncoa1 protein, mouse; D056920:Nuclear Receptor Coactivator 1