Hormone effects on cellular Ca2+ fluxes

Annual Review of Physiology
J R Williamson, J R Monck

Abstract

The involvement of inositol lipid metabolism in agonist-mediated Ca2+ signaling by Ins 1,4,5-P3 has become firmly established. Recent advances have led to a better understanding of the proteins associated with signal transduction in the plasma membrane. A number of specific receptors (G proteins, phospholipases and inositol lipid kinases) have now been purified and characterized. An Ins 1,4,5-P3 receptor has also been purified which is presumably involved in mediating Ca2+ efflux from intracellular stores. The morphological site of the hormone-sensitive Ca2+ pool has been tentatively identified as discrete, specialized intracellular structures (calciosomes), but further studies are required to demonstrate that these contain Ins 1,4,5-P3-gated Ca2+ channels and their possible functional relationship to the plasma membrane. Receptor occupancy by Ca2+ mobilizing agonists also stimulates Ca2+ entry into the cell, but the mechanism for activation of voltage insensitive Ca2+ channels and the possible involvement of Ins 1,4,5-P3, Ins 1,3,4,5-P4 and/or G proteins in this process has not been established. The Ca2+ signaling pathway is subject to multisite feedback regulation by Ca2+ itself and by a diacylglycerol-mediated activation of ...Continue Reading

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