信步杏庭 发表于 2015-3-23 22:17:51

MST4磷酸化TRAF6抑制免疫应答新机制

MST4磷酸化TRAF6抑制免疫应答新机制 来源:生物谷 2015-02-04 14:33

http://www-bioon.qiniudn.com/tm/UploadFiles/201502/2015020414343917.png  2015年2月4日讯 /生物谷BIOON/
  近日,来自中国科学院上海生化细胞所的周兆才研究组在著名国际生物学顶尖期刊NatureImmunology刊登了他们的一项最新研究成果,他们首次发现生发中心激酶MST4能够直接磷酸化TRAF6,抑制免疫应答反应。该研究对治疗因过度炎症反应造成的机体损伤具有重要借鉴意义。
  周兆才研究员指出,机体需要对免疫系统进行严格控制以避免出现过度炎症,保证宿主免受不必要损伤。他们首次发现生发中心激酶MST4能够动态应答细菌感染,并且扮演炎症负调控因子的角色,MST4能够直接作用于接头分子TRAF6并对其进行磷酸化,阻止其出现寡聚化以及泛素化作用。研究人员在TRAF6-/-胚胎成纤维细胞中过表达TRAF6的突变体,使得TRAF6的463和486位氨基酸不能被磷酸化,发现MST4不能抑制脂多糖诱导的细胞因子合成。在败血性休克模型中,MST4敲低表达的小鼠出现炎症加重,生存率降低的表型,同时发现TRAF6+/-小鼠能够缓和这种不利影响。
  综上所述,该文章揭示了调控TRAF6的重要分子机制并且着重强调了MST4在抑制过度免疫应答方面的重要作用。这项研究对治疗因炎症过度造成的机体损伤具有重要意义。
(转载自:生物谷Bioon.com 原标题:Nature Immunology:MST4磷酸化TRAF6抑制免疫应答新机制)
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doi:10.1038/ni.3097
The kinase MST4 limits inflammatory responses through direct phosphorylation of the adaptor TRAF6
Shi Jiao Zhen Zhang Chuanchuan Li Min Huang Zhubing Shi Yanyan Wang Xiaomin SongHeng Liu Chunyang Li Min Chen Wenjia Wang Yun Zhao Zhengfan Jiang Hongyan WangCatherine C L Wong Chen Wang Zhaocai Zhou

   Immune responses need to be tightly controlled to avoid excessive inflammation and prevent unwanted host damage. Here we report that germinal center kinase MST4 responded dynamically to bacterial infection and acted as a negative regulator of inflammation. We found that MST4 directly interacted with and phosphorylated the adaptor TRAF6 to prevent its oligomerization and autoubiquitination. Accordingly, MST4 did not inhibit lipopolysaccharide-induced cytokine production in Traf6?/? embryonic fibroblasts transfected to express a mutant form of TRAF6 that cannot be phosphorylated at positions 463 and 486 (with substitution of alanine for threonine at those positions). Upon developing septic shock, mice in which MST4 was knocked down showed exacerbated inflammation and reduced survival, whereas heterozygous deletion of Traf6 (Traf6+/?) alleviated such deleterious effects. Our findings reveal a mechanism by which TRAF6 is regulated and highlight a role for MST4 in limiting inflammatory responses.

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