Inositol 1,4,5-triphosphate (IP3) and inositol 1,3,4,5-tetrakisphosphate (IP4) are calcium-regulating second messenger molecules generated following the binding of a wide range of hormones and growth factors to their receptors. The actions of these messengers, which play important roles in the
Inositol 1,4,5-trisphosphate and inositol 1,3,4,5-tetrakisphosphate are Ca(2+)-regulating second messenger molecules which are generated via the cleavage of inositol lipids. We have previously shown that these species are autonomously generated in HL60 myeloid leukemia cells and that they may play a
Antigen-mediated exocytosis in intact rat basophilic leukemia (RBL-2H3) cells is associated with substantial hydrolysis of membrane inositol phospholipids and an elevation in concentration of cytosol Ca2+ ([ Ca2+i]). Paradoxically, these two responses are largely dependent on external Ca2+. We
In platelets, agonists that stimulate phosphoinositide turnover cause the rapid phosphorylation of a protein of apparent relative molecular mass (Mr) 40-47,000, called P47, by protein kinase C (PKC). Diverse identities have been ascribed to P47 including lipocortin, inositol 1,4,5-trisphosphate
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