[Interceptive activity of epostane in pregnant rats and rhesus monkeys].
A complete interceptive action on pregnancy was shown after ig epostane (Epo) 48 and 96 mg/kg on d 10 of pregnancy in rats. ED50 (95% fiducial limits) of Epo was 20.7 (16.3-26.3) mg/kg. Epo 48 mg/kg ig on d12, 14 and 16 of pregnancy lowered rat plasma progesterone concentrations (P less than 0.05) and plasma corticosterone on d 16 of pregnancy (P less than 0.05). Epo 35 mg/(kg.d) was given ig on d 50-54 of pregnancy in rhesus monkeys. Vaginal bleeding was seen in all of the 6 treated monkeys. Complete expulsions of fetal and placental materials occurred in 5 of the treated monkeys, among which 2 aborted on d 53 and the other 3 on d 54 of pregnancy. Plasma progesterone concentrations of the treated monkeys were lowered on d 52, 53 and 54 of pregnancy (P less than 0.05) and plasma estradiol on d 51, 52, 53, 54 and 55 (P less than 0.05), while there were no significant differences in plasma hydrocortisone. Epo may be a valuable supplement to the existing methods of female contraception.
Shanghai Institute of Planned Parenthood Research, China.
C G
CG
Liu
Z M
ZM
Lin
W K
WK
Li
P J
PJ
Shen
Z X
ZX
Wang
C Y
CY
Bao
W X
WX
Xu
D000028:Abortion, Induced / Q000662:veterinary; D000737:Androstenols / Q000494:pharmacology*; D000818:Animals; D003345:Corticosterone / Q000097:blood; D004958:Estradiol / Q000097:blood; D005260:Female; D006854:Hydrocortisone / Q000097:blood; D008253:Macaca mulatta; D011247:Pregnancy; D011374:Progesterone / Q000097:blood; D051381:Rats; D011919:Rats, Inbred Strains
D000737:Androstenols; D011374:Progesterone; D004958:Estradiol; C046855:epostane; D003345:Corticosterone; D006854:Hydrocortisone