Saccharide-mediated interactions of boar sperm surface proteins with components of the porcine oviduct

• Published in: Journal of Reproductive Immunology 2006-10, Vol.71 (2), p.112-125
• Main Authors: Liberda, Jiří, Maňásková, Pavla, Prelovská, Lucie, Tichá, Marie, Jonáková, Věra
• Format: Article
• Language: English
• Subjects: Animals; Biological and medical sciences; Boar seminal plasma proteins; Cell Adhesion Molecules - metabolism; Embryology: invertebrates and vertebrates. Teratology; Epithelial Cells - metabolism; Fallopian Tubes - cytology; Fallopian Tubes - metabolism; Female; Fluorescent Antibody Technique, Indirect; Fundamental and applied biological sciences. Psychology; Male; Protein Binding; Saccharide-mediated events; Seminal Plasma Proteins - metabolism; Sperm oviductal reservoir; Spermatozoa - metabolism; Spermatozoa - physiology; Swine
• ISSN: 0165-0378; 1872-7603; 1365-2567
• DOI: 10.1016/j.jri.2006.01.008

The role of boar seminal plasma proteins attached to the sperm plasma membrane during ejaculation has been studied in saccharide-mediated events in the female reproductive tract. Heparin-binding (Hep +) proteins (DQH sperm surface protein, and AQN and AWN spermadhesins) and their aggregated forms (fractions II and III) interacted more strongly with both oviductal epithelium cells and fluid than non-heparin-binding (Hep −) proteins (PSP I and PSP II spermadhesins) and their heterodimer (fraction IV), and interactions correlate with affinity of these proteins to yeast mannan. Indirect immunofluorescence (IMF) showed that the AQN 1 spermadhesin and fraction II bind to the apical glycocalyx of the ampulla, as well as the isthmic and uterine tubal junction regions of the oviductal sections. IMF demonstrated the recognition of AQN 1 and fraction II and mannosyl components of oviductal epithelium. We suggest that Hep + proteins (especially AQN 1, fraction II) on sperm could enable sperm binding to oviductal epithelium and thus participate in formation of the sperm oviductal reservoir. Interactions of Hep + proteins to oviductal epithelium were inhibited by mannan, hyaluronic acid and sialylated O-glycoproteins. No or slight inhibition was observed with sulphated polysaccharides (heparin, chondroitin sulphate) and simple monosaccharides. Besides that, attachment of boar seminal plasma proteins to oviductal epithelium cells was affected by oviductal fluid, the natural environment in the oviduct. Moreover, the ability of hyaluronic acid to inhibit the interaction of sperm surface proteins to the oviduct might play a role in sperm release from the oviductal reservoir and in the capacitation process.