Abstract
Immunoglobulin G (IgG) fraction was prepared from a serum obtained from an infertile woman (IS) that induced sperm agglutination of human and boar sperm. The antisperm antibodies interacted with a 50-kD boar sperm protein, determined by immunoblot. The 50-kD protein was extracted with deoxycholate (DOC) and purified by affinity chromatography on concanavalin A column, ion exchange chromatography on CM52 column, affinity chromatography on IS IgG-protein G-agarose, and by preparative electrophoresis with electroelution. The purified 50-kD protein migrated as a single homogeneous band when analyzed by sodium dodecyl sulfate polyacrylamide gel electrophoresis and by Western blot. The production of antibodies against specific sperm proteins may be a cause of immunological infertility.
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