RabGEF1 is a negative regulator of mast cell activation and skin inflammation

RabGEF1 is a negative regulator of mast cell activation and skin inflammation
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DOI:
10.1038/ni1093
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发表时间:
2004-08-01
期刊:
影响因子:
30.5
通讯作者:
Galli, SJ
Galli, SJ
中科院分区:
医学1区
文献类型:
--
作者:
Tam, SY;Tsai, M;Galli, SJ

文献摘要

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FcepsilonRI 受体与免疫球蛋白 E 和抗原聚集诱导的肥大细胞活化是通过多种蛋白激酶级联的活化介导的。在这里,我们报道了调节蛋白 RabGEF1 与 Ras 结合,负向调节 Ras 激活及其在 FcepsilonRI 依赖性肥大细胞激活中的“下游”效应通路。 RabGEF1 缺陷型肥大细胞响应 FcepsilonRI 聚集而表现出增强的脱颗粒以及脂质介质和细胞因子的释放。 RabGEF1 缺陷小鼠出现严重的皮肤炎症,并且肥大细胞数量增加。因此,RabGEF1是FcepsilonRI依赖性肥大细胞活化的负调节因子,并且RabGEF1的缺乏会导致体内皮肤炎症的发生。
Mast cell activation induced by aggregation of FcepsilonRI receptors with immunoglobulin E and antigen is mediated through the activation of multiple protein kinase cascades. Here we report that the regulatory protein RabGEF1 bound to Ras and negatively regulated Ras activation and its 'downstream' effector pathways in FcepsilonRI-dependent mast cell activation. RabGEF1-deficient mast cells showed enhanced degranulation and release of lipid mediators and cytokines in response to FcepsilonRI aggregation. RabGEF1-deficient mice developed severe skin inflammation and had increased numbers of mast cells. Thus, RabGEF1 is a negative regulator of FcepsilonRI-dependent mast cell activation, and a lack of RabGEF1 results in the development of skin inflammation in vivo.