This study identifies mitochondrial metabolism as a primary regulator of the immune activation of conventional dendritic cells, specifically the cDC1 subtype. While previous models suggested that oxidative phosphorylation was linked to immune tolerance, this research demonstrates that an active electron transport chain (ETC) is actually required for cDC1s to rapidly respond to stimuli and prime T cells for anti-cancer immunity. Mechanistically, electron flow maintains a critical balance of metabolites and redox states that shapes the epigenetic landscape of the cell. Specifically, ETC function prevents DNA hypermethylation at gene regions controlled by the transcription factors PU.1 and AP-1, keeping the cells "poised" for immediate transcriptional action. When this mitochondrial activity is impaired, cDC1s suffer from functional defects in migration and activation, whereas the cDC2 subtype remains largely unaffected. These findings suggest that targeting mitochondrial-epigenetic pathways could provide new strategies for enhancing vaccines and cancer immunotherapies.

References:

• Heras-Murillo I, Mañanes D, Calafell-Segura J, et al. Mitochondrial metabolism regulates the immunogenic responsiveness of dendritic cells[J]. Cell Metabolism, 2026.