Localization and characterization of the acrosomal antigen recognized by GB24 on human spermatozoa

Molecular Reproduction and Development
P FenichelB L Hsi

Abstract

GB24, a mouse monoclonal antibody, recognizes a trophoblast-leukocyte cross-reactive antigen (TLX), which is likely identical to the membrane cofactor protein (MCP), a complement regulatory protein. GB24 reacts also with a human acrosomal sperm antigen (Fénichel et al.: J Reprod Fertil 87:699-706, 1989). By immunofluorescence or immunoperoxidase, testicular, epididymal, and ejaculated spermatozoa were found to be positive after fixation by acetone. Motile, suspended spermatozoa became positive only through conditions known to induce acrosome reaction (A23187, follicular fluid, contact with oocytes). Ultrastructural studies with immunogold staining localized this protein on the inner acrosome membrane and in the acrosomal content. By SDS-polyacrylamide gel electrophoresis, GB24 immunoprecipitated a unique protein of 48 kDa from capacitated and A23187-induced spermatozoa under reducing conditions. No cross-reactivity was found with mouse, boar, or ram spermatozoa. Localization of this human sperm antigen recognized by GB24 and its similarity with the TLX-MCP family antigens would suggest a possible role of this molecule during fertilization in sperm-egg binding or immune protection.

References

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Citations

Jun 16, 1999·Molecular Reproduction and Development·A I YudinJ W Overstreet
Jul 12, 2002·Molecular Reproduction and Development·Rebecca C RileyJohn P Atkinson
Jan 1, 1993·Molecular Reproduction and Development·F CervoniB Rossi
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Aug 22, 2003·Biology of Reproduction·Mayumi I NonakaMasaru Nonaka
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Feb 1, 1995·American Journal of Reproductive Immunology : AJRI·P FenichelB L Hsi
Mar 18, 2003·Molecular and Cellular Biology·Naokazu InoueMasaru Okabe
Jun 27, 2012·The Journal of Cell Biology·Boris BaibakovJurrien Dean
Jan 11, 2016·Anatomical Science International·Chizuru Ito, Kiyotaka Toshimori
Apr 26, 2005·The Journal of Clinical Investigation·Rebecca C Riley-VargasJohn P Atkinson
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