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ECB-ART-37039
FEBS Lett 1998 Oct 23;4373:297-300. doi: 10.1016/s0014-5793(98)01254-x.
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A mammalian sperm cytosolic phospholipase C activity generates inositol trisphosphate and causes Ca2+ release in sea urchin egg homogenates.

Jones KT , Cruttwell C , Parrington J , Swann K .


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Injection of sperm extracts triggers Ca2+ oscillations in mammalian eggs similar to those seen at fertilisation. Here, we show that addition of sperm extracts to sea urchin egg homogenates causes Ca2+ release and inositol 1,4,5-trisphosphate (InsP3) production. Furthermore depleting homogenates of phosphatidylinositol lipids using a phosphatidylinositol-specific phospholipase C blocked the sperm extract from causing InsP3 production and a Ca2+ rise. A response could be recovered by the addition of phosphatidylinositol 4,5-bisphosphate to either sperm extracts or egg homogenates. These data indicate that sperm extracts contain an InsP3-generating phospholipase C which may play a role in Ca2+ release at fertilisation.

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Genes referenced: LOC100887844 LOC593358