Phagocytosis of sperm heads lacking the acrosomal process by unfertilized starfish oocytes

Keiichiro Kyozuka, Kenzi Osanai

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

In sperm of the starfish Asterina pectinifera, the acrosomal process and the flagellum were mechanically separated from the sperm head with a disperser. The sperm head fraction was then used to examine the direct interaction between the sperm head and the egg surface. Sperm heads lacking the acrosomal process and the flagellum did not fertilize oocytes, even after removal of the vitelline coat. Transmission electron microscopy showed that each denuded oocyte engulfed the sperm head without gamete membrane fusion. The sperm‐engulfing response, similar to phagocytosis, was induced without the mediation of the acrosomal process. The present results suggest that the process of sperm incorporation consists of two independent events, acrosomal process‐egg surface fusion and the phagocytotic movement of the egg surface.

Original languageEnglish
Pages (from-to)127-134
Number of pages8
JournalGamete Research
Volume21
Issue number2
DOIs
Publication statusPublished - 1988 Oct

Keywords

  • Asterina pectinifera
  • isolated sperm head
  • sperm incorporation
  • sperm‐engulfing response

ASJC Scopus subject areas

  • Genetics
  • Developmental Biology

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