α-Ketoglutarate dictates AMPK protein synthesis for energy sensing in human cancers

Abstract

The energy sensor AMP-activated protein kinase (AMPK) promotes tumor cell survival under stress but how to prevent AMPK activation to blunt tumor progression remains unclear. Here we show that the metabolite α-ketoglutarate (α-KG) dictates AMPK translation through a TET–YBX1 axis, which can be exploited to sensitize human cancer cells to energy stress. α-KG-deficient cells fail to activate AMPK under glucose starvation, which elicits cytosolic NADPH depletion and disulfidptosis. Mechanistically, α-KG insufficiency inhibits TET-dependent transcription of YBX1, an RNA-binding protein required for human-specific AMPK protein synthesis. Similarly, α-KG competitors including succinate and itaconate inhibit the YBX1–AMPK axis and sensitize cancer cells to glucose deprivation. Lastly, cotargeting oncogenic YBX1 and GLUT1 creates synthetic lethality and blunts tumor growth in vivo. Together, our findings link α-KG to energy sensing through AMPK translation and propose that targeting α-KG–YBX1-dependent AMPK translation can sensitize human cancer cells to energy stress for treatment. (Figure presented.)