Rap1b facilitates NK cell functions via IQGAP1-mediated signalosomes.

Rap1b facilitates NK cell functions via IQGAP1-mediated signalosomes.
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DOI:
10.1084/jem.20100040
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发表时间:
2010-08-30
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Malarkannan S
Malarkannan S
中科院分区:
其他
文献类型:
--
作者:
Awasthi A;Samarakoon A;Chu H;Kamalakannan R;Quilliam LA;Chrzanowska-Wodnicka M;White GC 2nd;Malarkannan S

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Rap 1 GTP酶控制淋巴细胞中的免疫突触形成和信号传导。然而,Rap 1调节自然杀伤(NK)细胞活化的精确分子机制尚不清楚。使用Rap 1a或Rap 1b基因敲除小鼠,我们确定Rap 1b作为NK细胞的主要亚型。它的缺乏显着损害LFA 1极化,扩散,和微管组织中心(MTOC)的形成在NK细胞。Rap 1同种型都不是NK细胞毒性所必需的。然而,Rap 1b的缺乏损害了NKG 2D,Ly 49 D和NCR 1介导的细胞因子和趋化因子的产生。激活后,Rap 1b与支架蛋白IQGAP 1共定位。这种相互作用促进了B-Raf、C-Raf和ERK 1/2的连续磷酸化,并帮助IQGAP 1在核周区域形成大的信号体。这些结果揭示了Rap 1b在NK细胞信号传导和效应器功能中的先前未被认识的作用。
Rap1 GTPases control immune synapse formation and signaling in lymphocytes. However, the precise molecular mechanism by which Rap1 regulates natural killer (NK) cell activation is not known. Using Rap1a or Rap1b knockout mice, we identify Rap1b as the major isoform in NK cells. Its absence significantly impaired LFA1 polarization, spreading, and microtubule organizing center (MTOC) formation in NK cells. Neither Rap1 isoform was essential for NK cytotoxicity. However, absence of Rap1b impaired NKG2D, Ly49D, and NCR1-mediated cytokine and chemokine production. Upon activation, Rap1b colocalized with the scaffolding protein IQGAP1. This interaction facilitated sequential phosphorylation of B-Raf, C-Raf, and ERK1/2 and helped IQGAP1 to form a large signalosome in the perinuclear region. These results reveal a previously unrecognized role for Rap1b in NK cell signaling and effector functions.
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