Biochemical Studies on the Acrosome Reaction of the Starfish, Asterias Amurensis I. Factors Participating in the Acrosome Reaction

In contrast with the case in sea urchin sperm, in starfish the acrosome reaction is not spontaneously induced by simply increasing the extracellular Ca2+ concentration or pH. At higher pHs, starfish sperm undergo morphological changes accompanied by exocytosis of the acrosomal vacuole, but they do n...

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Bibliographic Details
Published inDevelopment, growth & differentiation Vol. 23; no. 2; pp. 73 - 80
Main Authors IKADAI, HIROYUKI, HOSHI, MOTONORI
Format Journal Article
LanguageEnglish
Published Oxford, UK Blackwell Publishing Ltd 1981
Subjects
Asterias amurensis
Marine
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Summary:In contrast with the case in sea urchin sperm, in starfish the acrosome reaction is not spontaneously induced by simply increasing the extracellular Ca2+ concentration or pH. At higher pHs, starfish sperm undergo morphological changes accompanied by exocytosis of the acrosomal vacuole, but they do not form acrosomal filaments. Nomarski‐microscopic observation confirmed that spermatozoa undergo the acrosome reaction within the jelly coat. Acrosome reaction‐inducing substance, a glycoprotein from the egg jelly, required a diffusible cofactor(s) present in the egg jelly for full activity. Several lines of evidence showed that this diffusible factor(s) is not merely Ca2+.
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content type line 23
ISSN:0012-1592
1440-169X
DOI:10.1111/j.1440-169X.1981.00073.x