Cardiac-specific deletion of ATPIF1 in mice prevented the metabolic switch to glycolysis and protected against pathological remodeling and cardiac dysfunction during chronic stress.
ATPIF1 upregulation drives the metabolic shift to glycolysis in hypertrophied hearts, and its targeted deletion protects against pathological remodeling in preclinical models.
In hypertrophied and failing hearts, fuel metabolism is reprogrammed to increase glucose metabolism, especially glycolysis. This metabolic shift favors biosynthetic function at the expense of ATP production. Mechanisms responsible for the switch are poorly understood. We found that inhibitory factor 1 of the mitochondrial FoF1-ATP synthase (ATPIF1), a protein known to inhibit ATP hydrolysis by the reverse function of ATP synthase during ischemia, was significantly upregulated in pathological cardiac hypertrophy induced by pressure overload, myocardial infarction, or α-adrenergic stimulation. Chemical cross-linking mass spectrometry analysis of hearts hypertrophied by pressure overload suggested that increased expression of ATPIF1 promoted the formation of FoF1-ATP synthase nonproductive tetramer. Using ATPIF1 gain- and loss-of-function cell models, we demonstrated that stalled electron flow due to impaired ATP synthase activity triggered mitochondrial ROS generation, which stabilized HIF1α, leading to transcriptional activation of glycolysis. Cardiac-specific deletion of ATPIF1 in mice prevented the metabolic switch and protected against the pathological remodeling during chronic stress. These results uncover a function of ATPIF1 in nonischemic hearts, which gives FoF1-ATP synthase a critical role in metabolic rewiring during the pathological remodeling of the heart.
Zhou et al. (Sun,) conducted a other in Pathological cardiac hypertrophy. Cardiac-specific deletion of ATPIF1 vs. Wild-type or ATPIF1-floxed controls was evaluated on Metabolic switch to glycolysis and pathological cardiac remodeling. Cardiac-specific deletion of ATPIF1 in mice prevented the metabolic switch to glycolysis and protected against pathological remodeling and cardiac dysfunction during chronic stress.