SIRT1/MRPS5 axis enhances the metabolic flexibility of liver cancer stem cells.

08:00 EDT 22nd March 2019 | BioPortfolio

Summary of "SIRT1/MRPS5 axis enhances the metabolic flexibility of liver cancer stem cells."

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 complex-I of mitochondrial was necessary for stemness properties of liver CSCs via 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 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 gathered in nuclei leads to increased expression of glycolytic proteins and promotion of the Warburg Effect. Therefore, liver CSCs transform mitochondrial-dependent energy supply to a Warburg phenotype by the dual function of MRPS5. Clinical analysis of SIRT1 and MRPS5 expression in tumor tissues showed the SIRT1 /Cytoplasmic-MRPS5 profile was associated with poor prognosis hepatocellular carcinoma (HCC) patients. Conclusions: SIRT1/MRPS5 axis participates in metabolic reprogramming to facilitate tumor progression and may serve as a promising therapeutic target of liver cancer. This article is protected by copyright. All rights reserved.


Journal Details

This article was published in the following journal.

Name: Hepatology (Baltimore, Md.)
ISSN: 1527-3350


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