Abstract
The inhibitory effect of gossypol acetic acid on human sperm motility was studied with a transmembrane migration method. Gossypol decreased sperm motility after it had been incubated with semen for more than 15 min. However, when sperm motility was evaluated immediately after semen had been mixed with gossypol, no inhibitory effect could be found. We consider that the sperm immobilizing potency of gossypol is much less than our previously studied sperm immobilizing agents. It is unlikely that gossypol can be developed as a vaginal spermicide. The importance of time course in the pharmacological study of sperm motility is emphasized in this study.
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