Specific localization in the equatorial region of gp20, a 20 kDa sialylglycoprotein of the capacitated human spermatozoon acquired during epididymal transit which is necessary to penetrate zona-free hamster eggs

Riccardo Focarelli, Andrea Giuffrida, Sonia Capparelli, Marcello Scibona, Fabrizio Menchini Fabris, Felice Francavilla, Sandro Francavilla, Cinzia Della Giovampaola, Floriana Rosati

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

In this study we set out to characterize gp20, a 20 kDa glycoprotein of the human sperm surface, first identified by us by radiolabelling the sialic acid residues of the sperm surface [R. Focarelli et al. (1995), Mol. Hum. Reprod., 2, 2755-2759). The protein was partially purified from pooled sperm samples of several healthy donors and used to raise a specific antiserum to study its localization in the reproductive system. When tested with freshly ejaculated spermatozoa, the anti-gp20 antibody intensely stained the head and midpiece. However, on capacitated spermatozoa the antigen was restricted to a sharp zone in the equatorial region. The antibody did not bind to differentiating germ cells but the antigen was present in epididymal epithelial cells and also in seminal plasma. Anti-gp20 exerted a blocking effect in a test for sperm penetration of zona-free hamster eggs, thus suggesting that gp20 is involved in the early stages of fertilization.

Original languageEnglish (US)
Pages (from-to)119-125
Number of pages7
JournalMolecular Human Reproduction
Volume4
Issue number2
DOIs
StatePublished - Feb 1998

Keywords

  • Antibodies
  • Capacitation
  • Epididymal maturation
  • Fertilization
  • Human spermatozoa

ASJC Scopus subject areas

  • Reproductive Medicine
  • Embryology
  • Molecular Biology
  • Genetics
  • Obstetrics and Gynecology
  • Developmental Biology
  • Cell Biology

Fingerprint Dive into the research topics of 'Specific localization in the equatorial region of gp20, a 20 kDa sialylglycoprotein of the capacitated human spermatozoon acquired during epididymal transit which is necessary to penetrate zona-free hamster eggs'. Together they form a unique fingerprint.

Cite this