Functional heterogeneity and plasticity in naïve CD8 T cells drive superior effector and memory responses.

Naïve CD8 T cells marked by IL-18Rα, CD73, and CXCR3 exhibit superior persistence and effector/memory responses, enhancing protection.

• Why it matters: Understanding heterogeneity among naïve CD8 T cells is crucial because it influences immune response effectiveness, yet this diversity remains poorly characterized.
• What they did: The study identified naïve CD8 T cell subsets with enhanced function and demonstrated that less potent naïve cells can convert into these superior subsets via tonic TCR signaling, with increased Ly6C expression mediating better survival.
• The result: These findings reveal functional heterogeneity and plasticity among naïve CD8 T cells, uncovering a mechanism by which superior subsets promote robust immune responses and add a new layer to immune regulation.