title: [Effects of 16,16-dimethyl-trans-delta 2-PGE1 methyl ester (ONO-802) on reproductive function (author's transl)].
abstract: Effects of ONO-802 on maintenance of pregnancy, luteal function and ovulation were investigated. In pregnant rats, ONO-802 given i.p. showed antinidatory, abortifacient and strong labor-inducing effects with treatment on day 2, after day 17 and on day 21 of gestation, respectively. The abortifacient effect was not apparent when treatment was given from day 4-15. PGE1 had an antinidatory effect, PGF2 alpha had an abortifacient and labor-inducing effects after implantation, and PGE2 had both these effects. PGF2 alpha and PGE2 showed a luteolytic effect in rats, while ONO-802, similarly to the findings with PGE1, had no such effect. In pregnant rabbits, intraperitoneal ONO-802, exhibited antinidatory and abortifacient effects after implantation. Abortifacient effects were more potent with the progression of pregnancy of pregnancy though relatively large doses of ONO-802 were required. A significant decrease in peripheral blood progesterone level was observed in the group on high doses but the abortifacient effect of ONO-802 did not always depend on the decreases in the levels of progesterone. In cycling, spontaneously ovulating rats, the high doses of ONO-802 suppressed spontaneous ovulation when these doses were given two at 14:30 and 15:30 on the day of proestrus. ONO-802 did not inhibit the HCG-induced ovulation and the ovulation suppressed by ONO-802 was recovered by PGE2 or HCG.
mesh_terms: D000019:Abortifacient Agents; D000020:Abortifacient Agents, Nonsteroidal; D000527:Alprostadil / Q000031:analogs & derivatives*; D000818:Animals; D003340:Corpus Luteum Maintenance / Q000187:drug effects*; D003864:Depression, Chemical; D010064:Embryo Implantation / Q000187:drug effects*; D004958:Estradiol / Q000097:blood; D005260:Female; D007044:Hysterectomy; D010060:Ovulation / Q000187:drug effects*; D011247:Pregnancy; D011374:Progesterone / Q000097:blood; D011453:Prostaglandins / Q000494:pharmacology; D011459:Prostaglandins E, Synthetic / Q000494:pharmacology*; D011817:Rabbits; D051381:Rats
chemical_list: D000019:Abortifacient Agents; D000020:Abortifacient Agents, Nonsteroidal; D011453:Prostaglandins; D011459:Prostaglandins E, Synthetic; C021182:gemeprost; D011374:Progesterone; D004958:Estradiol; D000527:Alprostadil