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. 1996 Jun;7(6):843–851. doi: 10.1091/mbc.7.6.843

Phosphoinositides and phosphoinositide-utilizing enzymes in detergent-insoluble lipid domains.

H R Hope 1, L J Pike 1
PMCID: PMC275937  PMID: 8816992

Abstract

Recent evidence has implicated caveolae/DIGs in various aspects of signal transduction, a process in which polyphosphoinositides play a central role. We therefore undertook a study to determine the distribution of phosphoinositides and the enzymes that utilize them in these detergent-insoluble domains. We report here that the polyphosphoinositide phosphatase, but not several other phosphoinositide-utilizing enzymes, is highly enriched in a low density, Triton-insoluble membrane fraction that contains caveolin. This fraction is also enriched in polyphosphoinositides, containing approximately one-fifth of the total cellular phosphatidylinositol (4,5)P2. Treatment of cells with the tumor-promoting phorbol ester, phorbol 12-myristate 13-acetate (PMA), did not alter the distribution of polyphosphoinositides or the polyphosphoinositide phosphatase. However, PMA treatment did lead to a decrease in the mitogen-activated protein kinase and actin present in these domains. PMA also induced the recruitment of protein kinase C alpha to the caveolae/DIGs fraction. These findings suggest that polyphosphoinositides, the polyphosphoinositide phosphatase and protein kinase C play an important role in the structure or function of detergent-insoluble membrane domains.

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