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Abstract:
During chemotaxis, activation of the small guanosine triphosphataseRac is spatially regulated to organize the extension of membraneprotrusions in the direction of migration. In neutrophils, Racactivation is primarily mediated by DOCK2, an atypical guaninenucleotide exchange factor. Upon stimulation, we found thatDOCK2 rapidly translocated to the plasma membrane in a phosphatidylinositol3,4,5-trisphosphate–dependent manner. However, subsequentaccumulation of DOCK2 at the leading edge required phospholipaseD–mediated synthesis of phosphatidic acid, which stabilizedDOCK2 there by means of interaction with a polybasic amino acidcluster, resulting in increased local actin polymerization.When this interaction was blocked, neutrophils failed to formleading edges properly and exhibited defects in chemotaxis.Thus, intracellular DOCK2 dynamics are sequentially regulatedby distinct phospholipids to localize Rac activation duringneutrophil chemotaxis.
1 Division of Immunogenetics, Department of Immunobiology and Neuroscience, Medical Institute of Bioregulation, Kyushu University, Fukuoka 812-8582, Japan. 2 Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Tokyo 102-0075, Japan. 3 Department of Pharmacology, Center for Developmental Genetics, Stony Brook University, Stony Brook, NY 11794–5140, USA. 4 Graduate School of Comprehensive Human Sciences, Institute of Basic Medical Sciences, University of Tsukuba, Ibaraki 305-8575, Japan. 5 Division of Microbiology, Department of Pathology and Immunology, Akita University School of Medicine, Akita 010-8543, Japan. 6 Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan.
* Present address: College of Biological Sciences, China AgriculturalUniversity, Beijing 100193, China.
To whom correspondence should be addressed. E-mail: fukui{at}bioreg.kyushu-u.ac.jp
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