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

Naïve CD8 T cell subsets marked by IL-18Rα, CD73, and CXCR3 exhibit superior persistence and enhance effector and memory responses, boosting immune protection.

• Why it matters: Understanding heterogeneity among naïve CD8 T cells is crucial because it influences the strength and durability of immune responses, yet this diversity remains poorly characterized.
• What they did: The study identified specific naïve CD8 T cell subsets with markers indicating superior function and demonstrated that less potent naïve cells can convert into these subsets via tonic TCR signaling, using flow cytometry and functional assays.
• The result: These superior subsets promote better survival of progeny effector cells through increased Ly6C expression, enabling more robust immune responses and revealing new mechanisms of immune regulation.