Expression of cytochrome P450 1A1, an estrogen hydroxylase, in ovarian granulosa cells is developmentally regulated.
In this paper we report the analysis of porcine ovarian granulosa cells for the expression of several known hepatic estrogen hydroxylase RNAs. Of the P450s examined, only CYP 1A1 RNA was detected. Accordingly, the regulation of this mRNA was studied. The RNA for CYP 1A1 was dramatically and completely induced within 2 hours after exposure of immortalized granulosa cells to 3-methyl-cholanthrene (3MC) and expression could be inhibited with 10 microM phorbol myristate acetate. This message was also inducible by 3MC in cultured primary granulosa cells isolated from immature and developing follicles. Dexamethasone increased the relative expression of CYP 1A1 RNA in 3MC treated cells. In the absence of 3MC, the CYP 1A1 message was expressed in cultured granulosa cells from developing but not immature follicles, indicating developmental regulation of this enzyme. Further support for developmental regulation was provided by studies which detected the appearance of CYP 1A1 RNA during growth of ovarian follicles in vivo. This is the first report identifying a specific P450 estrogen hydroxylase RNA in ovarian granulosa cells.
Leighton
J K
JK
Department of Medicine, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA.
Canning
S
S
Guthrie
H D
HD
Hammond
J M
JM
D000818:Animals; D015152:Blotting, Northern; D002478:Cells, Cultured; D019363:Cytochrome P-450 CYP1A1; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis*; D003907:Dexamethasone / Q000494:pharmacology; D004790:Enzyme Induction; D004958:Estradiol / Q000378:metabolism; D005260:Female; D015971:Gene Expression Regulation, Enzymologic; D006107:Granulosa Cells / Q000187:drug effects / Q000201:enzymology*; D008597:Menstrual Cycle / Q000502:physiology*; D008748:Methylcholanthrene / Q000494:pharmacology; D012333:RNA, Messenger / Q000032:analysis; D013250:Steroid Hydroxylases / Q000096:biosynthesis*; D013552:Swine; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014204:Trenbolone Acetate / Q000031:analogs & derivatives / Q000494:pharmacology
D012333:RNA, Messenger; C023445:altrenogest; D004958:Estradiol; D008748:Methylcholanthrene; D003907:Dexamethasone; D003577:Cytochrome P-450 Enzyme System; D013250:Steroid Hydroxylases; D019363:Cytochrome P-450 CYP1A1; C020120:estrogen 2-hydroxylase; D013755:Tetradecanoylphorbol Acetate; D014204:Trenbolone Acetate