Binding patterns of bovine seminal plasma proteins A1/A2, 30 kDa and osteopontin on ejaculated sperm before and after incubation with isthmic and ampullary oviductal fluid

Animal Reproduction Science
Carlos Eduardo A SouzaG J Killian

Abstract

Previous studies from our laboratory have reported empirical associations between bovine seminal plasma protein(s) (BSP) A1/A2 and 30 kDa and osteopontin (OPN) in accessory sex gland fluid and bull fertility. These BSP and OPN are believed to bind to sperm at ejaculation and to remain bound until sperm reach the oviduct. The objective of the present study was to evaluate the topographical distribution of BSP A1/A2, 30 kDa and OPN binding on: (1) bovine ejaculated sperm; (2) ejaculated sperm incubated with isthmic oviductal fluid (ODF); (3) ejaculated sperm+isthmic ODF incubated in ampullary ODF. From each of these media, aliquots of sperm for BSP and OPN were processed for immunocytochemistry and analysis by laser scanning confocal microscopy. Isthmic and ampullary ODF was collected from indwelling catheters and used as pools from three cows in the non-luteal phase of the estrous cycle. Anti-BSP A1/A2 was detected bound to the midpiece, post-equatorial and equatorial segments and acrosome of sperm after ejaculation and after incubation with isthmic and ampullary ODF. The BSP A1/A2 fluorescence was more concentrated on the midpiece and increased as acrosome-intact sperm came in contact with ODF. As compared with acrosome-intact ...Continue Reading

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