Analysis of CD8+ T cell of BCD mice

The gut microbiome has garnered attention as an effective target to boost immunity and improve cancer immunotherapy. We found that B cell defective (BCD) mice, such as µ membrane targeted deletion (µMT) and activation-induced cytidine deaminase (AID) knockouts (KO), have elevated anti-tumor immunity under specific-pathogen-free but not germ-free conditions. Microbial dysbiosis in these BCD mice enriched the type I interferon (IFN) signature in mucosal CD8+ T cells, resulting in upregulation of the type I IFN-inducible protein stem cells antigen-1 (Sca-1). Among CD8+ T cells, naïve cells predominantly circulate from the gut to periphery, and those that had migrated from the mLN to the periphery had significantly higher expression of Sca-1. The gut-educated Sca-1+ naïve subset is endowed with enhanced mitochondrial activity and anti-tumor effector potential. The heterogeneity and functional versatility of the systemic naïve CD8+ T cell compartment was revealed by single cell analysis and functional assays of CD8+ T cell subpopulations. These results indicate one of the potential mechanisms through which microbial dysbiosis regulates anti-tumor immunity. 12 sample were included along with corresponding control (no replicates)