Cholesterol depletion delocalizes phosphatidylinositol bisphosphate and inhibits hormone-stimulated phosphatidylinositol turnover

Linda J. Pike, Joanne M. Miller

Research output: Contribution to journalArticlepeer-review

347 Scopus citations

Abstract

Caveolae and detergent-insoluble, glycosphingolipid-enriched domains (DIGs) are cholesterol-enriched membrane domains that have been implicated in signal transduction because a variety of signaling proteins as well as phosphatidylinositol bisphosphate (PtdInsP2) are compartmentalized in these domains. We report here that depletion of cellular cholesterol leads to the inhibition of epidermal growth factor- and bradykinin-stimulated PtdIns turnover in A431 cells. This is associated with the loss of compartmentalization of epidermal growth factor receptors, G(q), and PtdInsP2 in the low density membrane domains. Replacement of cellular cholesterol leads to the reorganization of signaling molecules in the low density domains and the reestablishment of hormone-stimulated PtdIns hydrolysis. Oxysterol derivatives show a variable ability to functionally replace the cholesterol in this system. These data are consistent with the hypothesis that localization of signaling proteins and lipids to cholesterol- enriched domains is required for the proper function of hormone-stimulated PtdIns turnover.

Original languageEnglish
Pages (from-to)22298-22304
Number of pages7
JournalJournal of Biological Chemistry
Volume273
Issue number35
DOIs
StatePublished - Aug 28 1998

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