Involvement of prostaglandins in LH-induced superovulation in the cyclic hamster.
Osmotic minipumps containing 400 micrograms ovine LH were inserted subcutaneously (sc) on day 1 (estrus) at 09:00-10:00h of the cycle in the hamster. This treatment induced increased ovarian blood flow by day 3 and superovulation of 30.0 +/- 1.4 ova at the next estrus compared to controls (16.5 +/- 0.8 ova). The continuous infusion of LH throughout the cycle increased prostaglandin F (PGF) and decreased prostaglandin E (PGE) in the growing follicles destined to ovulate and suppressed a day 3 increase in PGF concentrations in the nonluteal ovarian remnant devoid of the larger follicles. Indomethacin, a cyclooxygenase inhibitor, given sc (2 or 4 mg regimens) at 12:00-14:00h on days 1 and 2, at 09:00h and 17:00h on day 3 and at 09:00h on day 4 of the cycle to LH-infused and saline treated animals suppressed ovarian prostaglandin levels, prevented the superovulation and prevented the increased ovarian blood flow. Exogenous PGF2 alpha or PGE2 restored the superovulatory effect of LH infusion in the presence of indomethacin. The results suggest that the superovulation in response to continuous LH infusion may be mediated in part by prostaglandins via altered ovarian blood flow.
Brannian
J D
JD
Department of Physiology, Ralph L. Smith Research Center, University of Kansas Medical Center, Kansas City 66103.
Terranova
P F
PF
D000818:Animals; D006224:Cricetinae; D004971:Estrus / Q000187:drug effects*; D005260:Female; D066298:In Vitro Techniques; D007213:Indomethacin / Q000494:pharmacology; D007986:Luteinizing Hormone / Q000494:pharmacology*; D006080:Ovarian Follicle / Q000187:drug effects / Q000502:physiology*; D010053:Ovary / Q000098:blood supply; D011453:Prostaglandins / Q000502:physiology*; D011458:Prostaglandins E / Q000378:metabolism; D011460:Prostaglandins F / Q000378:metabolism; D012016:Reference Values; D012039:Regional Blood Flow / Q000187:drug effects; D013480:Superovulation
D011453:Prostaglandins; D011458:Prostaglandins E; D011460:Prostaglandins F; D007986:Luteinizing Hormone; D007213:Indomethacin