title: Gossypol-induced inhibition of guinea pig sperm capacitation in vitro.
abstract: The effect of gossypol acetate at various concentrations (10(-6) to 10(-4) M) on guinea pig sperm forward progressive movement, capacitation, and the acrosome reaction was explored in vitro. We found that 10(-4) M gossypol completely abolished the forward progressive motility of the sperm, and that this inhibition of motility was proportional to the concentration of gossypol used. Also, a dose-dependent decrease in acrosome reactions occurred with concentrations of the agent as low as 5.0 X 10(-6) M. However, we observed that such prevention of the acrosome reaction apparently happens at the capacitation stage rather than during the acrosome reaction itself. Inhibition of capacitation by gossypol was reversible--once the spermatozoa were capacitated in gossypol-free medium, the compound did not block the reaction.
mesh_terms: D000177:Acrosome / Q000187:drug effects / Q000502:physiology; D000818:Animals; D002118:Calcium / Q000494:pharmacology; D003864:Depression, Chemical; D006072:Gossypol / Q000031:analogs & derivatives* / Q000494:pharmacology; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008297:Male; D013075:Sperm Capacitation / Q000187:drug effects*; D013081:Sperm Motility / Q000187:drug effects; D013089:Spermatocidal Agents / Q000494:pharmacology*; D013094:Spermatozoa / Q000187:drug effects
chemical_list: D013089:Spermatocidal Agents; D006072:Gossypol; C028178:gossypol acetic acid; D002118:Calcium