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The phosphoinositide 3-kinase (PI3K) family catalyses the addition of a phosphate group to the D-3 position of polyphosphoinositides (PPIn). Since the discovery in the late 80s that phosphatidylinositol is phosphorylated in the D-3 position in eukaryotic cells, there has been an explosion of interest in these PPIn. Although the four D-3 PPIn (phosphatidylinositol 3-phophate (PtdIns3
P
), PtdIns(3,4)
P2
, PtdIns(3,5)
P2
, and PtdIns(3,4,5)
P3
) represent only a small proportion of PPIn, production of D-3 PPIn is required for an ever-increasing number of processes. Measurement of the PPIn levels in intact cells cultured cells has been vital to our understanding of the metabolism and function of these important signalling molecules; methods are described herein that allow measurement of PPIn levels in cultured cells, with emphasis on the 3-OH PPIn.
