Abstract
Despite significant advances in the past few years on the chemistry and biology of insulin and its receptor, the molecular events that couple the insulin-receptor interaction to the regulation of cellular metabolism remain uncertain. Progress in this area has been complicated by the pleiotropic nature of insulin’s actions. These most likely involve a complex network of pathways resulting in the coordination of mechanistically distinct cellular effects. Since the well-recognized mechanism of signal transduction (i.e., cyclic nucleotides, ion channels) appear not to be central to insulin action, investigators have searched for a novel second messenger system. A low molecular weight substance has been identified that mimics certain actions of insulin on metabolic enzymes. This substance has an inositol glycan structure, and is produced by the insulin-sensitive hydrolysis of a glycosylphosphatidylinositol (glycosyl-PI) in the plasma membrane. This hydrolysis reaction, which is catalyzed by a specific phospholipase C, also results in the production of a structurally distinct diacylglycerol, that may selectively regulate one or more of the protein kinases C. The glycosyl-PI precursor for the inositol glycan enzyme modulator is structurally analogous to the recently described glycosyl-PI membrane protein anchor. Preliminary studies suggest that a subset of proteins anchored in this fashion might be released from cells by a similar insulin-sensitive, phospholipase-catalyzed reaction. Future efforts will focus on the precise role of the metabolism of glycosyl-PI in insulin action.
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Saltiel, A.R., Cuatrecasas, P. (1990). Second Messengers of Insulin Action. In: Cuatrecasas, P., Jacobs, S. (eds) Insulin. Handbook of Experimental Pharmacology, vol 92. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-74098-5_14
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