Nicotinamide (NAM, a variant of vitamin B3) has recently been shown to accelerate the activation of human CD4+ and CD8+ T cells exposed to repeated CD3/CD28 agonism in vitro. Here, we demonstrate that T cells infiltrating mouse mammary carcinomas that are therapeutically controlled by NAM also express multiple markers of late-stage activation. Taken together, these findings lend additional support to the notion that the antineoplastic effects of NAM involve at least some degree of restored cancer immunosurveillance.
Keywords: CTLA4; Immune checkpoint inhibitors; Immunotherapy; LAG3; PD-1; TIM-3.
© 2022. The Author(s).