D-myo-Inositol-1,2,3,6-tetraphosphate, sodium salt is one of the many inositol phosphate (InsP) isomers that act as small, soluble second messengers in the transmission of cellular signals. The most studied InsP, Ins(1,4,5)-P3 is a second messenger produced in cells by phospholipase C (PLC)-mediated hydrolysis of phosphatidylinositol-4,5-biphosphate. Binding of Ins(1,4,5)-P3 to its receptor on the endoplasmic reticulum causes opening of the calcium channels and an increase in intracellular calcium. Ins(1,2,3,6)-P3 is less potent than Ins(1,4,5)-P3 at initiating Ca2+ release when injected into Xenopus oocytes.
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