Metabolic reprogramming driven by Ant2 deficiency augments T Cell function and anti-tumor immunity in mice.

T cell activation requires a substantial increase in NAD(+) production, often exceeding the capacity of oxidative phosphorylation (OXPHOS). To investigate how T cells adapt to this metabolic challenge, we generate T cell-specific ADP/ATP translocase-2 knockout (Ant2(-/-)) mice. Loss of Ant2, a crucial protein mediating ADP/ATP exchange between mitochondria and cytoplasm, induces OXPHOS restriction by limiting ATP synthase activity, thereby impeding NAD(+) regeneration. Interestingly, Ant2(-/-) naïve T cells exhibit enhanced activation, proliferation and effector functions compared to wild-type controls. Metabolic profiling reveals that these T cells adopt an activated-like metabolic program with increased mitobiogenesis and anabolism. Lastly, pharmacological inhibition of ANT in wild-type T cells recapitulates the Ant2(-/-) phenotype and improves adoptive T cell therapy of cancer in mouse models. Our findings thus suggest that Ant2-deficient T cells bypass the typical metabolic reprogramming required for activation, leading to enhanced T cell function and highlighting the therapeutic potential of targeting ANT for immune modulation.