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Alterations in lectin binding to guinea pig spermatozoa accompanying in vitro capacitation and the acrosome reaction.

The distribution of surface carbohydrates during in vitro capacitation of guinea pig (Cavia porcella) spermatozoa was probed by labeling membrane polysaccharides with fluorescent conjugates of the plant lectins. concanavalin A (Con A), wheat germ agglutinin (WGA) and soybean agglutinin (SBA). Lectin distributions over the surface of cauda epididymal cells were characteristic of each lectin studied. Labeling of live and prefixed cells during various temperature regimens indicated that no significant redistribution of lectin binding sites oocurs over the sperm head due either to lectin-induced or intrinsic membrane mobility changes. Spermatozoa exposed to lectins at prescribed intervals during capacitating incubations revealed few alterations in Con A and/or WGA labeling patterns; however, an increase in SBA binding over the surface of the flagellum was observed. Some cells exhibited a diminished fluorescence over the equatorial region with Con A or