Inducing an oxidized redox-balance improves anti-tumor CD8+ T cell function
Oh, J. H.; Cederberg, R. A.; Bopp, L.; Tanaka, E.; Ser, T.; Niyyati, S.; Patterson, A. E.; Amanat, N.; Dutra, J.; Ye, P.; Clark, M.; Ward-Hartstonge, K.; Archambault, A.-S.; Tsui, J.; Lange, P. F.; Tsai, S.; Verchere, C. B.; Park, Y.; Fabri, M.; Bennewith, K. L.; Geltink, R. I. K.
Show abstract
Cancer immunotherapy using antigen-specific CD8+ T cells depends on long-lasting anti-tumor function of the in vitro expanded T cells. T cell function is intricately linked to the activity of many metabolic pathways directly impacting the ability of CD8+ T cells to kill tumor cells. Metabolic conditioning in vitro better prepares CD8+ T cells for in vivo survival, tumor infiltration and tumor clearance. The mechanism underlying in vitro metabolic conditioning-induced augmented in vivo T cell function remains poorly understood. Here we show that metabolic conditioning of CD8+ effector T cells induces an oxidized cellular redox balance at least in part mediated by increased mitochondrial reactive oxygen species (ROS). This redox shift contributes to enhanced in vivo persistence and tumor clearance. In human tumour-infiltrating T cells, altering the redox balance ex-vivo reinvigorated pro-inflammatory cytokine production. Therefore, we believe that redox alterations present a targetable pathway to increase T cell-based anti-tumor immunotherapy efficacy.
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