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TBK1 at the Crossroads of Inflammation and Energy Homeostasis in Adipose Tissue.
Cell ( IF 45.5 ) Pub Date : 2018-Feb-08 , DOI: 10.1016/j.cell.2018.01.007
Peng Zhao 1 , Kai In Wong 2 , Xiaoli Sun 2 , Shannon M Reilly 1 , Maeran Uhm 3 , Zhongji Liao 2 , Yuliya Skorobogatko 1 , Alan R Saltiel 1
Affiliation  

The noncanonical IKK family member TANK-binding kinase 1 (TBK1) is activated by pro-inflammatory cytokines, but its role in controlling metabolism remains unclear. Here, we report that the kinase uniquely controls energy metabolism. Tbk1 expression is increased in adipocytes of HFD-fed mice. Adipocyte-specific TBK1 knockout (ATKO) attenuates HFD-induced obesity by increasing energy expenditure; further studies show that TBK1 directly inhibits AMPK to repress respiration and increase energy storage. Conversely, activation of AMPK under catabolic conditions can increase TBK1 activity through phosphorylation, mediated by AMPK's downstream target ULK1. Surprisingly, ATKO also exaggerates adipose tissue inflammation and insulin resistance. TBK1 suppresses inflammation by phosphorylating and inducing the degradation of the IKK kinase NIK, thus attenuating NF-κB activity. Moreover, TBK1 mediates the negative impact of AMPK activity on NF-κB activation. These data implicate a unique role for TBK1 in mediating bidirectional crosstalk between energy sensing and inflammatory signaling pathways in both over- and undernutrition.

中文翻译:


TBK1 处于脂肪组织炎症和能量稳态的十字路口。



非典型 IKK 家族成员 TANK 结合激酶 1 (TBK1) 被促炎细胞因子激活,但其在控制代谢中的作用仍不清楚。在这里,我们报告该激酶独特地控制能量代谢。 HFD 喂养的小鼠脂肪细胞中 Tbk1 表达增加。脂肪细胞特异性 TBK1 敲除 (ATKO) 通过增加能量消耗来减轻 HFD 引起的肥胖;进一步的研究表明TBK1直接抑制AMPK来抑制呼吸并增加能量储存。相反,在分解代谢条件下激活 AMPK 可以通过由 AMPK 下游靶点 ULK1 介导的磷酸化来增加 TBK1 活性。令人惊讶的是,ATKO 还夸大了脂肪组织炎症和胰岛素抵抗。 TBK1 通过磷酸化 IKK 激酶 NIK 并诱导其降解来抑制炎症,从而减弱 NF-κB 活性。此外,TBK1 介导 AMPK 活性对 NF-κB 激活的负面影响。这些数据表明 TBK1 在调节营养过度和营养不良的能量传感和炎症信号通路之间的双向串扰方面发挥着独特的作用。
更新日期:2018-02-09
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