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Biol Reprod. 1992 Apr;46(4):641-7.

Cocaine inhibits mating-induced, but not human chorionic gonadotropin-stimulated, ovulation in the rabbit.

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Department of Obstetrics and Gynecology, Hutzel Hospital, Wayne State University School of Medicine, Detroit, Michigan 48201.


The effects of cocaine on ovulation and corpus luteum function were investigated in New Zealand White rabbits. Forty females were randomly assigned to control and cocaine-treated groups. Controls were given vehicle s.c. daily for 5 days and cocaine-treated rabbits received 40 mg/kg cocaine hydrochloride s.c. daily for 5 days. One hour after the last cocaine dose, half the control and half of the cocaine-treated groups were mated with fertile males and the other half of each group received hCG i.v. Serial blood samples were obtained over 4 h on the day of mating or hCG treatment (Day 0), and then at intervals from Days 1-18. No mated, cocaine-treated rabbits ovulated, vs. 6 of 10 controls (chi-square: p = 0.01). In contrast, all animals given hCG had comparable numbers of corpora lutea (control: 7.1 +/- 0.8; cocaine: 5.7 +/- 0.8). Peak levels of benzoylecgonine (the major cocaine metabolite) occurred between 180 and 240 min after cocaine administration. In cocaine-treated animals that were mated, Day 0 serum LH (repeated measures MANOVA, p less than 0.01) and FSH (p less than 0.03) concentrations were lower than those in pregnant controls. Serum LH and FSH levels for all hCG recipients (cocaine-treated and control) did not differ. Serum prolactin concentrations in mated, pregnant rabbits were higher than in all other groups; cocaine treatment did not affect this hormone.(ABSTRACT TRUNCATED AT 250 WORDS).

[Indexed for MEDLINE]

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