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Autophagy is required for the activation of NFκB

机译:自噬是激活NFκB所必需的

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It is well established that the activation of the inhibitor of NFκB (IκBα) kinase (IKK) complex is required for autophagy induction by multiple stimuli. Here, we show that - in autophagy-competent mouse embryonic fibroblasts (MEFs) - distinct autophagic triggers including starvation, mTOR inhibition with rapamycin and p53 inhibition with cyclic pifithrin α lead to the activation of IKK, followed by the phosphorylation-dependent degradation of IκBα and nuclear translocation of NFκB. Remarkably, the NFκB signaling pathway was blocked in MEFs lacking either the essential autophagy genes Atg5 or Atg7. In addition, we found that tumor necrosis factor α (TNFα)-induced NFκB nuclear translocation is abolished in both Atg5- and Atg7-deficient MEFs. Similarly, the depletion of essential autophagy modulators including ATG5, ATG7, Beclin 1 and VPS34 by RNA interference inhibited TNFα-driven NFκB activation in two human cancer cell lines. In conclusion, it appears that, at least in some instances, autophagy is required for NFκB activation, highlighting an intimate crosstalk between these two stress response signaling pathways.
机译:众所周知,通过多种刺激诱导自噬需要激活NFκB(IκBα)激酶(IKK)复合物的抑制剂。在这里,我们显示-在具有自噬能力的小鼠胚胎成纤维细胞(MEF)中,不同的自噬触发因素包括饥饿,雷帕霉素对mTOR的抑制作用以及环菲丝菌素α对p53的抑制作用导致IKK的激活,继而磷酸化依赖性降解IκBα和NFκB的核易位。值得注意的是,在缺少必需自噬基因Atg5或Atg7的MEF中,NFκB信号通路被阻断。此外,我们发现,在Atg5和Atg7缺失的MEF中,肿瘤坏死因子α(TNFα)诱导的NFκB核移位均被消除。类似地,RNA干扰对包括ATG5,ATG7,Beclin 1和VPS34在内的必需自噬调节剂的耗竭抑制了两种人类癌细胞系中TNFα驱动的NFκB的活化。总之,似乎至少在某些情况下,自噬是NFκB激活所必需的,这突显了这两个应激反应信号通路之间的紧密串扰。

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