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:
影响因子:
--
通讯作者:
Malarkannan S
中科院分区:
文献类型:
--
作者:
Awasthi A;Samarakoon A;Chu H;Kamalakannan R;Quilliam LA;Chrzanowska-Wodnicka M;White GC 2nd;Malarkannan S
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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DOI:
10.1083/jcb.200404068
发表时间:
2004-10-11
期刊:
The Journal of cell biology
影响因子:
--
作者:
Arthur WT;Quilliam LA;Cooper JA
通讯作者:
Cooper JA
影响因子:
4.4
作者:
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通讯作者:
Mathew, PA
影响因子:
4.8
作者:
Jeong, Ha-Won;Li, Zhigang;Sacks, David B.
通讯作者:
Sacks, David B.
DOI:
10.1073/pnas.0604236103
发表时间:
2006-07-05
影响因子:
11.1
作者:
Chen, Xi;Allan, David S. J.;Strominger, Jack L.
通讯作者:
Strominger, Jack L.
影响因子:
4.8
作者:
Li, ZG;Kim, SH;Sacks, DB
通讯作者:
Sacks, DB