A synthetic, pure phosphoinositol for signal transduction research
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Ins(2,5,6)P3 (sodium salt) is a member of the inositol phosphate (InsP) family of second messengers that play a critical role 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 the Ins(1,4,5)P3 to its receptor on the endoplasmic reticulum results in opening of calcium channels and an increase in intracellular calcium. Ins(2,5,6)P3 is a less potent inducer of calcium release from permeabilized rat basophilic leukemia cells with an EC50 value of 110 µM compared to Ins(1,4,5)P3, which has an EC50 value of 0.17 µM.