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Biology of Reproduction, Vol 50, 27-37, Copyright © 1994 by Society for the Study of Reproduction

ARTICLES

Major proteins of bovine seminal vesicles bind to spermatozoa [published erratum appears in Biol Reprod 1994 Apr;50(4):977]

P Manjunath, L Chandonnet, E Leblond and L Desnoyers
Department of Medicine, University of Montreal, Maisonneuve-Rosemont Hospital Research Center, Quebec, Canada.

Bovine seminal vesicles synthesize a family of closely related proteins, namely BSP-A1, BSP-A2, BSP-A3, and BSP-30-kDa (collectively called BSP proteins). Recently, we showed that these proteins bind specifically to choline phospholipids. Since this class of phospholipids is the major phospholipid fraction of the spermatozoan membrane, we investigated the binding of BSP proteins to spermatozoa. Polyclonal antibodies against purified BSP proteins raised in rabbits were used to detect these antigens in bovine epididymal and ejaculated spermatozoa as well as in bovine seminal plasma. Comparison of spermatozoa taken from the caudae epididymides with ejaculated spermatozoa through use of various techniques, namely, surface labeling followed by immunoprecipitation and immunoblotting, showed that epididymal spermatozoa are devoid of BSP proteins whereas ejaculated spermatozoa possess membrane-bound BSP proteins. Through use of the indirect immunofluorescence technique, the ejaculated spermatozoa of bull were characterized by an immunoreaction restricted to the midpiece, acrosome, and postacrosomal region, but no specific immunostaining could be found on the surface of epididymal spermatozoa. Surface-labeled BSP proteins on spermatozoa could not be displaced with buffers containing high salt concentration (1 M NaCl), but could be displaced specifically with phosphorylcholine (alone or in combination with urea). The data indicate that the BSP proteins that are secretory products of the seminal vesicles bind to the sperm surface upon ejaculation.


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Copyright © 1994 by the Society for the Study of Reproduction.