Quantification of PtdInsP3 molecular species in cells and tissues by mass spectrometry.
Class I phosphoinositide-3-kinase (PI3K) isoforms generate the intracellular signaling lipid, phosphatidylinositol(3,4,5)trisphosphate (PtdIns(3,4,5)P(3)). PtdIns(3,4,5)P(3) regulates major aspects of cellular behavior, and the use of both genetic and pharmacological intervention has revealed important isoform-specific roles for PI3Ks in health and disease. Despite this interest, current methods for measuring PtdIns(3,4,5)P(3) have major limitations, including insensitivity, reliance on radio...Expand abstract
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