AMPKα1-LDH pathway regulates muscle stem cell self-renewal by controlling metabolic homeostasis
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Control of stem cell fate to either enter terminal differentiation versus returning to quiescence (self-renewal) is crucial for tissue repair. Here, we showed that AMP-activated protein kinase (AMPK), the master metabolic regulator of the cell, controls muscle stem cell (MuSC) self-renewal. AMPKα1−/− MuSCs displayed a high self-renewal rate, which impairs muscle regeneration. AMPKα1−/− MuSCs showed a Warburg-like switch of their metabolism to higher glycolysis. We identified lactate dehydrogenase (LDH) as a new functional target of AMPKα1. LDH, which is a non-limiting enzyme of glycolysis in differentiated cells, was tightly regulated in stem cells. In functional experiments, LDH overexpression phenocopied AMPKα1−/− phenotype, that is shifted MuSC metabolism toward glycolysis triggering their return to quiescence, while inhibition of LDH activity rescued AMPKα1−/− MuSC self-renewal. Finally, providing specific nutrients (galactose/glucose) to MuSCs directly controlled their fate through the AMPKα1/LDH pathway, emphasizing the importance of metabolism in stem cell fate.
Originalsprog | Engelsk |
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Tidsskrift | EMBO Journal |
Vol/bind | 36 |
Udgave nummer | 13 |
Sider (fra-til) | 1946-1962 |
Antal sider | 17 |
ISSN | 0261-4189 |
DOI | |
Status | Udgivet - 3 jul. 2017 |
Eksternt udgivet | Ja |
ID: 238739193