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Sperm migration-inhibiting antibody in human cervicovaginal secretions.

Samples of cervical mucus were taken from 200 women visiting the Obs tetrics and Gynecology Clinic at the University of Lausanne Medical School in order to study the sperm migration-inhibiting antibody in human cervicovaginal secretions. The antisperm activity was detected by use of the technique of inhibition of the migration of sperm up a capillary tube after incubation for a 2-hour period. Antisperm activity was detected in secretions of some normal women and more frequently in women with sterility problems of unknown etiology and in women in the early months of pregnancy. Antisperm activity was removed from secretions with anti-IgM antibody while anti-IgA or anti-IgG were without effect. Activity eluted from a pooled sample of strongly inhibitory secretions by chromatography on a Sephadex G-200 column suggested a large molecule. These results suggest the presence in cervical mucus of antibody to antigens on the surface of the sperm and that this antibody is locally produced since serum from the same individuals is without sperm-inhibiting activity.