Sequential regulation of DOCK2 dynamics by two phospholipids during neutrophil chemotaxis.

Sequential regulation of DOCK2 dynamics by two phospholipids during neutrophil chemotaxis.
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DOI:
10.1126/science.1170179
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发表时间:
2009-04-17
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Fukui Y
Fukui Y
中科院分区:
其他
文献类型:
--
作者:
Nishikimi A;Fukuhara H;Su W;Hongu T;Takasuga S;Mihara H;Cao Q;Sanematsu F;Kanai M;Hasegawa H;Tanaka Y;Shibasaki M;Kanaho Y;Sasaki T;Frohman MA;Fukui Y

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在趋化过程中,小鸟苷三磷酸酶 Rac 的激活受到空间调节,以组织膜突起沿迁移方向延伸。在中性粒细胞中,Rac 激活主要由 DOCK2(一种非典型鸟嘌呤核苷酸交换因子)介导。受到刺激后,我们发现 DOCK2 以磷脂酰肌醇 3,4,5-三磷酸依赖性方式快速转移至质膜。然而,随后 DOCK2 在前沿的积累需要磷脂酶 D 介导的磷脂酸合成,磷脂酸通过与多元氨基酸簇的相互作用稳定 DOCK2,导致局部肌动蛋白聚合增加。当这种相互作用被阻断时,中性粒细胞无法正确形成前缘并表现出趋化性缺陷。因此,细胞内 DOCK2 动力学由不同的磷脂依次调节,以在中性粒细胞趋化过程中定位 Rac 激活。
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.
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