Mitophagy Controls the Activities of Tumor Suppressor p53 to Regulate Hepatic Cancer Stem Cells.
Mitophagy Controls the Activities of Tumor Suppressor p53 to Regulate Hepatic Cancer Stem Cells.
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DOI:
10.1016/j.molcel.2017.09.022
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发表时间:
2017-10-19
期刊:
影响因子:
16
通讯作者:
Ou JJ
中科院分区:
文献类型:
--
作者:
Liu K;Lee J;Kim JY;Wang L;Tian Y;Chan ST;Cho C;Machida K;Chen D;Ou JJ
Autophagy is required for benign hepatic tumors to progress into malignant hepatocellular carcinoma. However, the mechanism is unclear. Here we report that mitophagy, the selective removal of mitochondria by autophagy, positively regulates hepatic cancer stem cells (CSCs) by suppressing the tumor suppressor p53. When mitophagy is enhanced, p53 colocalizes with mitochondria and is removed by a mitophagy-dependent manner. However, when mitophagy is inhibited, p53 is phosphorylated at serine-392 by PINK1, a kinase associated with mitophagy, on mitochondria and translocated into the nucleus where it binds to the NANOG promoter to prevent OCT4 and SOX2 transcription factors from activating the expression of NANOG, a transcription factor critical for maintaining the stemness and the self-renewal ability of CSCs, resulting in the reduction of hepatic CSC populations. These results demonstrate that mitophagy controls the activities of p53 to maintain hepatic CSCs and provide an explanation to why autophagy is required to promote hepatocarcinogenesis. Autophagy is required for the malignant transformation of liver tumors. Liu et al. demonstrated that mitophagy, the selective removal of mitochondria by autophagy, was required to maintain the hepatic cancer stem cell population by removing mitochondria-associated p53, which otherwise would be activated by PINK1 to suppress the expression of NANOG.
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