title: Monoclonal antibody to a membrane glycoprotein inhibits the acrosome reaction and associated Ca2+ and H+ fluxes of sea urchin sperm.
abstract: Monoclonal antibodies were prepared using sea urchin (Strongylocentrotus purpuratus) sperm or isolated sperm plasma membrane vesicles as immunogen. Two monoclonal antibodies, J4/4 and J10/14, react with different epitopes on external domains of the same Mr = 210,000 integral-membrane glycoprotein. At Fab fragment concentrations of equivalent cell surface binding, J10/14 inhibits the egg jelly-induced exocytotic acrosome reaction and associated Ca2+ influx and H+ efflux, whereas J4/4 does not. Immunofluorescent localization shows that both monoclonal antibodies react with a narrow collar of plasma membrane over the acrosomal complex and also with the entire flagellum.
authors.forename: J S
authors.initials: JS
authors.lastname: Trimmer
authors.forename: I S
authors.initials: IS
authors.lastname: Trowbridge
authors.forename: V D
authors.initials: VD
authors.lastname: Vacquier
mesh_terms: D000177:Acrosome / Q000502:physiology*; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology / Q000502:physiology*; D002118:Calcium / Q000378:metabolism; D005455:Fluorescent Antibody Technique; D006023:Glycoproteins / Q000276:immunology / Q000502:physiology*; D007140:Immunoglobulin Fab Fragments / Q000276:immunology; D007074:Immunoglobulin G / Q000276:immunology; D008297:Male; D008565:Membrane Proteins / Q000502:physiology*; D051379:Mice; D008807:Mice, Inbred BALB C; D011522:Protons; D012617:Sea Urchins; D013094:Spermatozoa / Q000276:immunology / Q000502:physiology*
chemical_list: D000911:Antibodies, Monoclonal; D006023:Glycoproteins; D007140:Immunoglobulin Fab Fragments; D007074:Immunoglobulin G; D008565:Membrane Proteins; D011522:Protons; D002118:Calcium