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The FASEB Journal, Vol 3, 1899-1905, Copyright © 1989 by The Federation of American Societies for Experimental Biology
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JW Putney Jr, H Takemura, AR Hughes, DA Horstman and O Thastrup
Laboratory of Cellular and Molecular Pharmacology, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709.
Activation of a variety of cell surface receptors results in the phospholipase C-catalyzed hydrolysis of the minor plasma membrane phospholipid phosphatidylinositol 4,5-bisphosphate, with concomitant formation of inositol 1,4,5-trisphosphate and diacylglycerol. There is strong evidence that inositol 1,4,5-trisphosphate stimulates Ca2+ release from intracellular stores. The Ca2+-releasing actions of inositol 1,4,5-trisphosphate are terminated by its metabolism through two distinct pathways. Inositol 1,4,5-trisphosphate is dephosphorylated by a 5-phosphatase to inositol 1,4-bisphosphate; alternatively, inositol 1,4,5-trisphosphate can also be phosphorylated to inositol 1,3,4,5-tetrakisphosphate by a 3-kinase. Although the mechanism of Ca2+ mobilization is understood, the precise mechanisms involved in Ca2+ entry are not known; the proposal that inositol 1,4,5-trisphosphate secondarily elicits Ca2+ entry by emptying an intracellular Ca2+ pool is considered.
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