ECB-ART-52291
Dev Growth Differ
1981 Jan 01;232:73-80. doi: 10.1111/j.1440-169X.1981.00073.x.
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Biochemical Studies on the Acrosome Reaction of the Starfish, Asterias Amurensis I. Factors Participating in the Acrosome Reaction.
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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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