Changes in the sialylglycoconjugate distribution on the human sperm surface during in-vitro capacitation: Partial purification of a 20 kda sialylglycoprotein of capacitated spermatozoa

Riccardo Focarelli, Andrea Giuffrida, Floriana Rosati

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Changes in the distribution of sialylglycoconjugates on the surface of uncapacitated and in-vitro capacitated human spermatozoa were studied by means of two sialic acid specific lectins [Maackia amurensis agglutinin and Sambucus nigra agglutinin). On the uncapacitated sperm surface, sialylglycoconjugates were found be localized from the post-acrosomal region of the sperm head to the tail middle piece, whereas after invitro capacitation these molecules were only found in a small area of the post-acrosomal region. The surface of capacitated human spermatozoa was also investigated by specifically radiolabelling its terminal sialic acid residues. A 20 kDa glycoprotein, which was partially purified by anion-exchange chromatography, was the main component of the sialylglycoconjugate pattern after in-vitro capacitation.

Original languageEnglish (US)
Pages (from-to)2755-2759
Number of pages5
JournalHuman Reproduction
Issue number10
StatePublished - Oct 1995



  • Capacitation
  • Glycoconjugates
  • Human spermatozoa
  • Lectins
  • Sialic acid

ASJC Scopus subject areas

  • Reproductive Medicine
  • Obstetrics and Gynecology

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