Myc inhibition impairs autophagosome formation.

Myc inhibition impairs autophagosome formation.
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DOI:
10.1093/hmg/ddt381
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发表时间:
2013-12-20
影响因子:
3.5
通讯作者:
Rubinsztein DC
Rubinsztein DC
中科院分区:
生物学2区
文献类型:
--
作者:
Toh PP;Luo S;Menzies FM;Raskó T;Wanker EE;Rubinsztein DC

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自噬是许多长寿蛋白质和细胞器的主要清除途径,长期以来一直与癌症发展有关。Myc是一种常被发现在许多癌症中失调的原癌基因,因此是设计癌症治疗的有吸引力的靶点。因此,了解抗Myc策略与自噬之间的关系对于开发有效的治疗方法将是重要的。在这里,我们发现Myc的耗竭抑制自噬体的形成,并损害自噬底物的清除。Myc抑制通过减少c-Jun N-末端激酶1(JNK 1)和B细胞淋巴瘤2(Bcl 2)磷酸化对自噬具有抑制作用。此外,在Myc敲低的情况下观察到的JNK 1磷酸化的减少与ROS产生的减少有关。我们的数据表明,在癌症治疗中靶向Myc可能具有抑制自噬的额外益处,因为治疗抵抗与化疗诱导的自噬相关。
Autophagy, a major clearance route for many long-lived proteins and organelles, has long been implicated in cancer development. Myc is a proto-oncogene often found to be deregulated in many cancers, and thus is an attractive target for design of cancer therapy. Therefore, understanding the relationship between anti-Myc strategies and autophagy will be important for development of effective therapy. Here, we show that Myc depletion inhibits autophagosome formation and impairs clearance of autophagy substrates. Myc suppression has an inhibitory effect on autophagy via reduction of c-Jun N-terminal kinase 1 (JNK1) and B-cell lymphoma 2 (Bcl2) phosphorylation. Additionally, the decrease in JNK1 phosphorylation observed with Myc knockdown is associated with a reduction in ROS production. Our data suggest that targeting Myc in cancer therapy might have the additional benefit of inhibiting autophagy in the case of therapy resistance associated with chemotherapy-induced autophagy.
p62/SQSTM1形成自噬降解的蛋白质聚集体,并对亨廷顿蛋白诱导的细胞死亡具有保护作用。
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