Sirtuin‐1/Mitochondrial Ribosomal Protein S5 Axis Enhances the Metabolic Flexibility of Liver Cancer Stem Cells

作者：Zhihao Wei, Jiankun Jia, Gang Heng, Huailong Xu, Juanjuan Shan, Guiqin Wang, Chungang Liu, Jianyu Xia, Haijun Zhou, Min Wu, Zhi Yang, Meiling Wang, Zhouxing Xiong, Hong Huang, Limei Liu, Cheng Qian · 发表于：Hepatology · 年份：2019 · DOI：10.1002/hep.30622 · 被引用次数：80 · 研究领域：Mitochondrial Function and Pathology、Cancer, Hypoxia, and Metabolism、Sirtuins and Resveratrol in Medicine

Metabolic reprogramming endows cancer cells with the ability to adjust metabolic pathways to support heterogeneously biological processes. However, it is not known how the reprogrammed activities are implemented during differentiation of cancer stem cells (CSCs). In this study, we demonstrated that liver CSCs relied on the enhanced mitochondrial function to maintain stemness properties, which is different from aerobic glycolysis playing main roles in the differentiated non‐CSCs. We found that liver CSCs exhibit increased mitochondrial respiratory capacity and that complex‐I of mitochondria was necessary for stemness properties of liver CSCs through regulation of mitochondrial respiration. Bioinformatics analysis reveals that mitochondrial ribosomal protein S5 (MRPS5) is closely related with the function of complex‐I. Further experiments confirmed that MRPS5 promoted the production of nicotinamide adenine dinucleotide (NAD + ), which is necessary for enhanced mitochondrial function in liver CSCs. MRPS5 played a critical role for liver CSCs to maintain stemness properties and to participate in tumor progression. Mechanistically, the acetylation status of MRPS5 is directly regulated by NAD + dependent deacetylase sirtuin‐1 (SIRT1), which is abundant in liver CSCs and decreased during differentiation. Deacetylated MRPS5 locates in mitochondria to promote the function complex‐I and the generation of NAD + to enhance mitochondrial respiration. Conversely, the acetylated MRPS5 gathe...