Induction of the human sperm acrosome reaction with mannose-containing neoglycoprotein ligands

• Published in: Molecular human reproduction Vol. 3; no. 10; pp. 827 - 837
• Main Authors: BENOFF, S, HURLEY, I. R, MANDEL, F. S, COOPER, G. W, HERSHLAG, A
• Format: Journal Article
• Language: English
• Published: Oxford Oxford University Press 01.10.1997
• Subjects: Acrosome - drug effects; Acrosome - metabolism; Acrosome - physiology; Allosteric Regulation - drug effects; Biological and medical sciences; Birth control; Exocytosis - drug effects; Female; Glycoproteins - metabolism; Glycoproteins - pharmacology; Gynecology. Andrology. Obstetrics; Humans; Infertility, Male - etiology; Ligands; Male; Mannose - metabolism; Mannose - pharmacology; Medical sciences; Protein Structure, Tertiary - drug effects; Spermatozoa - drug effects; Spermatozoa - metabolism; Spermatozoa - physiology; Sterility. Assisted procreation; Human; Lectin; Spermatozoa; Binding capacity; Fertilizing ability; Acrosome reaction; Male sterility; Glycoproteins; Mannose; Oocyte
• ISSN: 1360-9947; 1460-2407; 1460-2407
• DOI: 10.1093/molehr/3.10.827

In the interest of classifying cases of male factor infertility, we have paid particular attention to the sugar ligand binding properties of the human sperm surface and the functional capacity of the acrosome for exocytosis--key parameters for assessing sperm fertilizing ability. Zona recognition and binding involve the interactions of sperm surface mannose receptors (lectins) with mannose ligands on the zona pellucida. Sperm surface mannose lectins can be visualized by their ability to bind a synthetic model zona ligand, fluorescein isothiocyanate (FITC)-conjugated mannosylated bovine serum albumin (BSA) (Man-FITC-BSA). We now report that Man-FITC-BSA biologically also mimics the effects of solubilized authentic human zonae, in that binding of Man-FITC-BSA results in a time-dependent receptor aggregation and the induction of acrosome exocytosis in capacitated sperm populations from fertile donors. In our assay, the addition of mM amounts of mannose monosaccharide to Man-FITC-BSA increases the number of polyvalent mannose ligands bound by individual spermatozoa and increases the rate of the acrosome reactions induced by Man-FITC-BSA, thereby increasing specimen processing efficiency. We conclude that exposure of human spermatozoa to polyvalent mannose ligands + D-mannose monosaccharide offers a new, convenient and readily available system to study sperm capacity for induced acrosome loss.