Prostaglandin E2 increases cyp19 expression in rat granulosa cells: implication of GATA-4.
The expression of Cyp19, the key gene of estrogen biosynthesis, in granulosa cells (GC) is essential for follicular growth and coordination of the ovulatory process. The goal of this study was to examine the effect of PGE2 and PGF2alpha on Cyp19 expression in undifferentiated and luteinized GC (UGC and LGC). In UGC, PGE2 increased Cyp19 mRNA and Cyp19 protein levels whereas PGF2alpha had no effect. In LGC, PGF2alpha decreased Cyp19 expression whereas PGE2 had no effect. Gene-reporter experiments demonstrated that PGE2 increases Cyp19 transcription in UGC. A protein kinase A inhibitor blocked PGE2-induced increase in Cyp19 promoter activity. PGE2 increased GATA-4 binding to the Cyp19 promoter. Mutation of the GATA binding site resulted in the loss of PGE2 stimulation. This study demonstrates that PGE2 stimulates Cyp19 expression in rat GC and suggests that GATA-4 may mediate (at least in part) the stimulatory effect of PGE2.
Cai
Zailong
Z
Department of Obstetrics, Gynecology and Reproductive Science, Yale School of Medicine, New Haven, CT 06520, United States.
Kwintkiewicz
Jakub
J
Young
Mary Elizabeth
ME
Stocco
Carlos
C
D000818:Animals; D001141:Aromatase / Q000235:genetics* / Q000378:metabolism; D015153:Blotting, Western; D002478:Cells, Cultured; D015237:Dinoprost / Q000494:pharmacology; D015232:Dinoprostone / Q000494:pharmacology*; D024202:Electrophoretic Mobility Shift Assay; D005260:Female; D050991:GATA4 Transcription Factor / Q000378:metabolism*; D005786:Gene Expression Regulation; D006107:Granulosa Cells / Q000187:drug effects* / Q000201:enzymology; D008184:Luteal Cells / Q000378:metabolism; D010120:Oxytocics / Q000494:pharmacology*; D011401:Promoter Regions, Genetic / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D012045:Regulatory Sequences, Nucleic Acid; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014158:Transcription, Genetic; D015533:Transcriptional Activation
D050991:GATA4 Transcription Factor; D010120:Oxytocics; D012333:RNA, Messenger; D015237:Dinoprost; D001141:Aromatase; D015232:Dinoprostone