Rapidly inducible changes in phosphatidylinositol 4,5-bisphosphate levels influence multiple regulatory functions of the lipid in intact living cells

P. Várnai, Baskaran Thyagarajan, Tibor Rohacs, Tamas Balla

Research output: Contribution to journalArticle

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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)P2) 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 PLCδ1PH-GFP fusion construct. This decrease was paralleled by rapid termination of the ATP-induced Ca2+ 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)P2 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)P2 depletion.

Original languageEnglish
Pages (from-to)377-382
Number of pages6
JournalJournal of Cell Biology
Volume175
Issue number3
DOIs
Publication statusPublished - Nov 6 2006

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Phosphatidylinositols
phosphoinositide 5-phosphatase
Tacrolimus Binding Protein 1A
Phosphatidylinositol 4,5-Diphosphate
Cell Membrane
Lipids
Sirolimus
Menthol
Transferrin
Phosphoric Monoester Hydrolases
Epidermal Growth Factor
Phospholipids
Adenosine Triphosphate
Enzymes
Proteins
phosphatidylinositol 5-phosphate

ASJC Scopus subject areas

  • Cell Biology

Cite this

Rapidly inducible changes in phosphatidylinositol 4,5-bisphosphate levels influence multiple regulatory functions of the lipid in intact living cells. / Várnai, P.; Thyagarajan, Baskaran; Rohacs, Tibor; Balla, Tamas.

In: Journal of Cell Biology, Vol. 175, No. 3, 06.11.2006, p. 377-382.

Research output: Contribution to journalArticle

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