title: Rat cholesterol side-chain cleavage enzyme (P-450scc): use of a cDNA probe to study the hormonal regulation of P-450scc mRNA levels in ovarian granulosa cells.
abstract: A rat ovarian cDNA library was constructed and screened by differential colony hybridization to detect cDNA clones specific for mRNA induced by follicle-stimulating hormone (FSH). The cDNA clone which demonstrated the greatest degree of induction contained a 766-bp insert which was characterized and sequenced. We conclude that this cDNA is specific for the rat gene coding for cholesterol side-chain cleavage enzyme (P-450scc) by virtue of nucleotide sequence homology to the bovine and human P-450scc cDNA sequences. Southern blotting of rat genomic DNA suggests the presence of a single P-450scc gene. Northern blot analysis indicates that P-450scc mRNA is present in steroidogenic tissues (ovary, adrenal, testis), but not in brain, kidney, liver, lung, or heart. The rat P-450scc mRNA is induced by FSH or pregnant mare's serum gonadotropin in ovaries of estrogen-treated immature rats in vivo. In cultured granulosa cells, estradiol treatment alone did not increase P-450scc mRNA levels, but in combination with FSH or 8-Br-cAMP resulted in three- to four-fold increase in this mRNA.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002417:Cattle; D002786:Cholesterol Side-Chain Cleavage Enzyme / Q000235:genetics*; D003001:Cloning, Molecular; D004247:DNA / Q000378:metabolism; D005260:Female; D005640:Follicle Stimulating Hormone / Q000494:pharmacology*; D005786:Gene Expression Regulation; D005796:Genes / Q000187:drug effects*; D006107:Granulosa Cells / Q000187:drug effects / Q000201:enzymology*; D006801:Humans; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000187:drug effects / Q000235:genetics*; D051381:Rats; D011919:Rats, Inbred Strains; D012689:Sequence Homology, Nucleic Acid; D014158:Transcription, Genetic / Q000187:drug effects*
chemical_list: D012333:RNA, Messenger; D005640:Follicle Stimulating Hormone; D004247:DNA; D002786:Cholesterol Side-Chain Cleavage Enzyme