Abstract
Receptor-mediated activation of phospholipase C (PLC) leads to the hydrolysis of membrane inositol phospholipids, generating diacylglycerol (DAG) and water-soluble inositol phosphates. This signaling mechanism is used by antigen receptors on T and B cells that have been implicated as mediators of receptor-induced influx of extracellular Ca(2+). This unit provides protocols that describe the resolution of InsP by Dowex anion-exchange chromatography. This technique provides a reliable means of separating inositol monophosphate, inositol bisphosphate, and inositol trisphosphate, but does not resolve isomers of these. An Alternate Protocol describes the separation of inositol phosphates by anion-exchange HPLC. A protocol for resolution of inositol phospholipids by thin-layer chromatography (TLC) is also provided.
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