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of total phosphatidylinositol bisphosphate (PIP2). identification Based on HPLC analysis, PI 3,4-P2 in unstimulated platelets represented < 0.5% of total PIP2 (which corresponds to < 7.0 pmol/1 x 10(9) platelets). Fatty acid analysis of this lipid revealed a composition very similar to the conventional polyphosphoinositides (stearic and arachidonic acids accounting for 44.2 and 40.4 mol %, respectively, of the fatty acids). Since PI 3,4-P2 also did not appear to be distinct from the other polyphosphoinositides, in regard to radiolabeling properties, it was concluded that this lipid is identification unlikely to originate from a unique precursor pool. This conclusion validates the identification use of HPLC analysis of radiolabeled phosphoinositides for the estimation of PI 3,4-P2 mass in agonist-stimulated platelets. The chromatographic procedure described should prove useful for the mass and fatty acid analysis of PI 3,4-P2 from other cell systems.PMID:
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