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. 1987 Jun 15;244(3):757–761. doi: 10.1042/bj2440757

Subcellular localization of inositol lipids in blood platelets as deduced from the use of labelled precursors.

G Mauco 1, P Dajeans 1, H Chap 1, L Douste-Blazy 1
PMCID: PMC1148060  PMID: 3446190

Abstract

1. By rapid fractionation of blood platelet lysates on Percoll density gradients at alkaline pH (9.6), a very pure plasma-membrane fraction was obtained, as well as discrimination between endoplasmic reticulum and lysosomes. 2. Labelling of intact platelets with [32P]Pi followed by subcellular fractionation showed an exclusive localization of all inositol lipids in the plasma membrane. 3. Preincubation of whole platelets with myo-[3H]inositol in a buffer containing 1 mM-MnCl2 allowed incorporation of the label into PtdIns (phosphatidylinositol) of both plasma and endoplasmic-reticulum membrane, whereas [3H]PtdIns4P (phosphatidylinositol 4-phosphate) and [3H]PtdIns(4,5)P2 (phosphatidylinositol 4,5-bisphosphate) were exclusively found on the plasma membrane. 4. It is concluded that PtdIns4P and PtdIns(4,5)P2 are exclusively localized in the plasma membrane, whereas PtdIns is present in both plasma and endoplasmic-reticulum membranes. This could provide an explanation for previously reported data on hormone-sensitive and -insensitive inositol lipid pools.

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Selected References

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