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• W1556029557 abstract "Abstract We report the isolating and sequencing of three cDNA clones encoding rat P-450scc, the nucleotide and protein sequences of which are highly homologous to those of bovine and human P-450scc, especially in the putative heme and steroid binding domains. We document that different molecular mechanisms regulate P-450scc in granulosa cells of preovulatory (PO) follicles prior to and after luteinization. Luteinizing hormone/human chorionic gonadotropin (LH/hCG) and cAMP are obligatory to induce P-450scc mRNA in PO granulosa cells in vivo and in vitro. Once P-450scc mRNA is induced as a consequence of the LH/hCG surge it is constitutively maintained by luteinized cells in vivo (0-4 days) and in vitro (0-9 days) in the absence of gonadotropins, is susceptible to modulation by prolactin and is no longer regulated by cAMP. Exposure to elevated concentrations of hCG in vivo for 5-7 h was required for PO granulosa cells to undergo a functional transition establishing the stable luteal cell phenotype. Transient exposure of PO + hCG (7 h) follicles in vitro to the RNA synthesis inhibitor actinomycin D (1 microgram/ml) or the protein synthesis inhibitor cycloheximide (10 micrograms/ml), for 1-5 h prior to culturing the granulosa cells failed to disrupt the induction of P-450scc mRNA, progesterone biosynthesis, and appearance of the luteal cell morphology. Inhibitors of protein kinase A (Rp-cAMPS; 1-500 microM and N-[2-(methylamino)ethyl]-5-isoquinolinesulfonamide dihydrochloride (H8); 1-200 microM) added directly to the luteinized cell cultures also failed to alter P-450scc mRNA in these cells, although the cells contain in vivo amounts of mRNA for RII beta, RI alpha, and C alpha, the primary subunits of protein kinase A found in the rat ovary. These data suggest that expression of the P-450scc gene in rat ovarian follicular cells is regulated in a sequential manner by cAMP-dependent and cAMP-independent mechanisms associated with granulosa cells and luteal cells, respectively." @default.
• W1556029557 created "2016-06-24" @default.
• W1556029557 creator A5029964903 @default.
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• W1556029557 date "1989-12-01" @default.
• W1556029557 modified "2023-09-29" @default.
• W1556029557 title "Cyclic AMP-dependent and -independent Regulation of Cholesterol Side Chain Cleavage Cytochrome P-450 (P-450scc) in Rat Ovarian Granulosa Cells and Corpora Lutea." @default.
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• W1556029557 doi "https://doi.org/10.1016/s0021-9258(20)88275-1" @default.
• W1556029557 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/2480959" @default.
• W1556029557 hasPublicationYear "1989" @default.
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