Relationship between the production capacity of ovarian 13,14-dihydro-prostaglandin F2-alpha and the process of ovulation in immature female rats pretreated with gonadotropin.
The purpose of this work was to investigate the effects of gonadotropin on the production capacity of ovarian 13,14-dihydro-prostaglandin F2-alpha (13,14H2-PGF2 alpha) and whether or not this capacity had any relation to the process of ovulation in rat. To induce the first ovulation, immature rats were injected subcutaneously with PMSG (5 IU/rat) at 8:00 at 26 days of age and some of these rats were followed by an intraperitoneal injection of hCG (10 IU/rat) at 57 hrs after PMSG treatment. The 13,14H2-PGF2 alpha production capacity was unchanged as compared with vehicle control until 57 hrs after PMSG treatment. However, the capacity showed a striking increase at 60 hrs after PMSG treatment. A maximal increase of about 7 fold was observed at 9 hrs after hCG injection just before ovulation. The production capacity of the Graafian follicle (GF) and the part (WO-GF) of the whole ovary (WO) from which the GF is removed at 2:00 on day 29 and the capacity of early corpus luteum at 8:00 on day 29 was greater than that of GF and WO-GF at 0:00 on day 29. These results suggest that the 13,14H2-PGF2 alpha production capacity in rat ovary is regulated by gonadotropin and is closely associated with the process of ovulation.
Kogo
H
H
Department of Pharmacology, Tokyo College of Pharmacy, Japan.
Tamura
K
K
Satoh
T
T
Taya
K
K
Sasamoto
S
S
D000818:Animals; D006063:Chorionic Gonadotropin / Q000502:physiology; D015237:Dinoprost / Q000031:analogs & derivatives* / Q000096:biosynthesis / Q000502:physiology; D005187:Fallopian Tubes / Q000378:metabolism; D005260:Female; D006062:Gonadotropins / Q000494:pharmacology*; D006064:Gonadotropins, Equine / Q000494:pharmacology; D006080:Ovarian Follicle / Q000502:physiology; D010060:Ovulation; D051381:Rats; D011919:Rats, Inbred Strains
D006063:Chorionic Gonadotropin; D006062:Gonadotropins; D006064:Gonadotropins, Equine; C008228:15-keto-13,14-dihydroprostaglandin F2alpha; D015237:Dinoprost