Pretreatment effects of jelly components on the sperm acrosome reaction and histone degradation in the starfish, Asterina pectinifera. |
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| Authors: | T Amano Y Okita T Matsui M Hoshi |
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| Affiliation: | Department of Life Science, Tokyo Institute of Technology, Yokohama, Japan. |
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| Abstract: | Acrosome reaction (AR) and histone degradation (HD) of Asterina pectinifera sperm are induced by co-operation of ARIS and a diffusible fraction (M8) of egg jelly. Once sperm are treated with ARIS or M8 separately for several minutes, they do not undergo the AR in response to the egg jelly. Preincubation of sperm with M8 at 0 degrees C is not effective to block the jelly-induced AR whereas inhibitory effects of ARIS remain at 0 degrees C. Jelly-induced HD is inhibited by pretreatment of sperm with ARIS but is not affected by the incubation with M8. The blockage of the jelly-induced reactions, both AR and HD, by ARIS- or M8-pretreatment can be bypassed by ionophores, A23187 and monensin. |
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