Sequential regulation of DOCK2 dynamics by two phospholipids during neutrophil chemotaxis

Akihiko Nishikimi, Hideo Fukuhara, Wenjuan Su, Tsunaki Hongu, Shunsuke Takasuga, Hisashi Mihara, Qinhong Cao, Fumiyuki Sanematsu, Motomu Kanai, Hiroshi Hasegawa, Yoshihiko Tanaka, Masakatsu Shibasaki, Yasunori Kanaho, Takehiko Sasaki, Michael A. Frohman, Yoshinori Fukui

研究成果: ジャーナルへの寄稿学術誌査読

213 被引用数 (Scopus)


During chemotaxis, activation of the small guanosine triphosphatase Rac is spatially regulated to organize the extension of membrane protrusions in the direction of migration. In neutrophils, Rac activation is primarily mediated by DOCK2, an atypical guanine nucleotide exchange factor. Upon stimulation, we found that DOCK2 rapidly translocated to the plasma membrane in a phosphatidylinositol 3,4,5-trisphosphate-dependent manner. However, subsequent accumulation of DOCK2 at the leading edge required phospholipase D-mediated synthesis of phosphatidic acid, which stabilized DOCK2 there by means of interaction with a polybasic amino acid cluster, resulting in increased local actin polymerization. When this interaction was blocked, neutrophils failed to form leading edges properly and exhibited defects in chemotaxis. Thus, intracellular DOCK2 dynamics are sequentially regulated by distinct phospholipids to localize Rac activation during neutrophil chemotaxis.

出版ステータス出版済み - 4月 17 2009

!!!All Science Journal Classification (ASJC) codes

  • 一般


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