Rapidly Inducible Changes in Phosphatidylinositol 4,5-bisphosphate Levels Influence Multiple Regulatory Functions of the Lipid in Intact Living Cells

Overview

Journal J Cell Biol

Specialty Cell Biology

Date 2006 Nov 8

PMID 17088424

Citations 206

Authors

Peter Varnai

Baskaran Thyagarajan

Tibor Rohacs

Tamas Balla

Affiliations

Soon will be listed here.

Abstract

Rapamycin (rapa)-induced heterodimerization of the FRB domain of the mammalian target of rapa and FKBP12 was used to translocate a phosphoinositide 5-phosphatase (5-ptase) enzyme to the plasma membrane (PM) to evoke rapid changes in phosphatidylinositol 4,5-bisphosphate (PtdIns(4,5)P(2)) levels. Rapa-induced PM recruitment of a truncated type IV 5-ptase containing only the 5-ptase domain fused to FKBP12 rapidly decreased PM PtdIns(4,5)P(2) as monitored by the PLCdelta1PH-GFP fusion construct. This decrease was paralleled by rapid termination of the ATP-induced Ca(2+) signal and the prompt inactivation of menthol-activated transient receptor potential melastatin 8 (TRPM8) channels. Depletion of PM PtdIns(4,5)P(2) was associated with a complete blockade of transferrin uptake and inhibition of epidermal growth factor internalization. None of these changes were observed upon rapa-induced translocation of an mRFP-FKBP12 fusion protein that was used as a control. These data demonstrate that rapid inducible depletion of PM PtdIns(4,5)P(2) is a powerful tool to study the multiple regulatory roles of this phospholipid and to study differential sensitivities of various processes to PtdIns(4,5)P(2) depletion.

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