Acute depletion of plasma membrane phosphatidylinositol 4,5-bisphosphate impairs specific steps in endocytosis of the G-protein-coupled receptor

DáNiel J. Tóth, J. Tóth, Gergö Gulyás, A. Balla, Tamas Balla, L. Hunyady, P. Várnai

Research output: Contribution to journalArticle

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Abstract

Receptor endocytosis plays an important role in regulating the responsiveness of cells to specific ligands. Phosphatidylinositol 4,5-bisphosphate [PtdIns(4,5)P2] has been shown to be crucial for endocytosis of some cell surface receptors, such as EGF and transferrin receptors, but its role in G-protein-coupled receptor internalization has not been investigated. By using luciferase-labeled type 1 angiotensin II (AT1R), type 2C serotonin (5HT2CR) or ß2 adrenergic (ß2AR) receptors and fluorescently tagged proteins (ß-arrestin-2, plasma-membrane-targeted Venus, Rab5) we were able to follow the sequence of molecular interactions along the endocytic route of the receptors in HEK293 cells using the highly sensitive method of bioluminescence resonance energy transfer and confocal microscopy. To study the role of plasma membrane PtdIns(4,5)P2 in receptor endocytosis, we used our previously developed rapamycin-inducible heterodimerization system, in which the recruitment of a 5-phosphatase domain to the plasma membrane degrades PtdIns(4,5)P2. Here we show that ligand-induced interaction of AT1, 5HT2C and ß2A receptors with b-arrestin-2 was unaffected by PtdIns(4,5)P2 depletion. However, trafficking of the receptors to Rab5-positive early endosomes was completely abolished in the absence of PtdIns(4,5)P2. Remarkably, removal of the receptors from the plasma membrane was reduced but not eliminated after PtdIns(4,5)P2 depletion. Under these conditions, stimulated AT1 receptors clustered along the plasma membrane, but did not enter the cells. Our data suggest that in the absence of PtdIns(4,5)P2, these receptors move into clathrin-coated membrane structures, but these are not cleaved efficiently and hence cannot reach the early endosomal compartment.

Original languageEnglish
Pages (from-to)2185-2197
Number of pages13
JournalJournal of Cell Science
Volume125
Issue number9
DOIs
Publication statusPublished - May 1 2012

Fingerprint

Phosphatidylinositol 4,5-Diphosphate
G-Protein-Coupled Receptors
Phosphatidylinositols
Endocytosis
Cell Membrane
Venus
Ligands
Clathrin
HEK293 Cells
Endosomes
Energy Transfer
Cell Surface Receptors
Sirolimus
Transferrin
Luciferases
Phosphoric Monoester Hydrolases
Confocal Microscopy
Angiotensin II
Adrenergic Receptors
Serotonin

Keywords

  • Bioluminescence resonance energy transfer
  • Endocytosis
  • G-protein-coupled receptors
  • Phosphoinositides

ASJC Scopus subject areas

  • Cell Biology

Cite this

Acute depletion of plasma membrane phosphatidylinositol 4,5-bisphosphate impairs specific steps in endocytosis of the G-protein-coupled receptor. / Tóth, DáNiel J.; Tóth, J.; Gulyás, Gergö; Balla, A.; Balla, Tamas; Hunyady, L.; Várnai, P.

In: Journal of Cell Science, Vol. 125, No. 9, 01.05.2012, p. 2185-2197.

Research output: Contribution to journalArticle

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