Phosphatidylinositol-4,5-bisphosphate Hydrolysis Directs Actin Remodeling During Phagocytosis

Overview

Journal J Cell Biol

Specialty Cell Biology

Date 2005 Apr 6

PMID 15809313

Citations 109

Authors

Cameron C Scott

Wendy Dobson

Roberto J Botelho

Natasha Coady-Osberg

Philippe Chavrier

David A Knecht

Colin Heath

Philip Stahl

Sergio Grinstein

Affiliations

Soon will be listed here.

Abstract

The Rho GTPases play a critical role in initiating actin polymerization during phagocytosis. In contrast, the factors directing the disassembly of F-actin required for fission of the phagocytic vacuole are ill defined. We used fluorescent chimeric proteins to monitor the dynamics of association of actin and active Cdc42 and Rac1 with the forming phagosome. Although actin was found to disappear from the base of the forming phagosome before sealing was complete, Rac1/Cdc42 activity persisted, suggesting that termination of GTPase activity is not the main determinant of actin disassembly. Furthermore, fully internalized phagosomes engineered to associate constitutively with active Rac1 showed little associated F-actin. The disappearance of phosphatidylinositol-4,5-bisphosphate (PI(4,5)P(2)) from the phagosomal membrane closely paralleled the course of actin disassembly. Furthermore, inhibition of PI(4,5)P(2) hydrolysis or increased PI(4,5)P(2) generation by overexpression of phosphatidylinositol phosphate kinase I prevented the actin disassembly necessary for the completion of phagocytosis. These observations suggest that hydrolysis of PI(4,5)P(2) dictates the remodeling of actin necessary for completion of phagocytosis.

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