| RRC ID |
45053
|
| Author |
Hagiwara A, Ogiwara K, Katsu Y, Takahashi T.
|
| Title |
Luteinizing hormone-induced expression of Ptger4b, a prostaglandin E2 receptor indispensable for ovulation of the medaka Oryzias latipes, is regulated by a genomic mechanism involving nuclear progestin receptor.
|
| Journal |
Biol Reprod
|
| Abstract |
We previously reported that the prostaglandin E2 receptor subtype Ptger4b plays a role in ovulation in a teleost species, medaka and that ptger4b mRNA is drastically induced in preovulatory follicles prior to ovulation. The present study focuses on the hormonal regulation of ptger4b mRNA expression using this nonmammalian vertebrate model. Preovulatory follicles that had not been exposed to luteinizing hormone (Lh) in vivo were incubated in vitro with medaka recombinant Lh (rLh), which induced the ptger4b mRNA expression. The addition of trilostane, an inhibitor of 3beta-hydroxysteroid dehydrogenase, strongly inhibited rLh-induced ptger4b expression, and trilostane-suppressed ptger4b expression was restored to the level observed in rLh-treated follicles when 17alpha, 20beta-dihydroxy-4-pregnen-3-one was included in the culture. We determined that the expression of the progestin-activated transcription factor nuclear progestin receptor (Pgr) was also induced by medaka rLh in the follicle and that its expression preceded ptger4b expression. Forskolin treatment induced both pgr and ptger4b mRNA expression in the follicle. Follicular ptger4b mRNA expression was drastically suppressed by RU486, which was demonstrated to compete with 17alpha, 20beta-dihydroxy-4-pregnen-3-one for medaka Pgr in vitro, suggesting a role for Pgr in the expression of ptger4b mRNA. A chromatin immunoprecipitation assay with preovulatory follicles isolated from spawning medaka ovaries demonstrated direct binding of Pgr to the ptger4b promoter. These results indicate that ptger4b expression is regulated by a genomic mechanism involving Pgr.
|
| Volume |
90(6)
|
| Pages |
126
|
| Published |
2014-6-1
|
| DOI |
10.1095/biolreprod.113.115485
|
| PII |
biolreprod.113.115485
|
| PMID |
24790162
|
| MeSH |
Animal Fins / cytology
Animals
Base Sequence
CHO Cells
Cricetulus
Female
Follicular Phase / physiology
Genomics
Luciferases / genetics
Luteinizing Hormone / metabolism*
Models, Animal
Molecular Sequence Data
Oryzias / genetics*
Oryzias / physiology
Ovary / cytology
Ovary / physiology
Ovulation / physiology*
Phylogeny
Primary Cell Culture
Promoter Regions, Genetic / physiology
RNA, Messenger / metabolism
Receptors, Progesterone / genetics
Receptors, Progesterone / metabolism*
Receptors, Prostaglandin E, EP4 Subtype / genetics
Receptors, Prostaglandin E, EP4 Subtype / metabolism*
Transcription, Genetic / physiology
|
| IF |
3.322
|
| Times Cited |
20
|
|
WOS Category
|
REPRODUCTIVE BIOLOGY
|
| Resource |
| Human and Animal Cells |
OLHNI-2(RCB2942) |
