Uncovering an adaptive immune hallmark of extreme longevity.

Supercentenarians possess expanded, nonexhausted CD4+ cytotoxic T lymphocytes that maintain potent cytotoxicity, indicating an adaptive immune feature linked to extreme longevity.

• Why it matters: Understanding immune mechanisms in supercentenarians can reveal how immune resilience contributes to healthy aging and longevity, filling a gap in aging research.
• What they did: Hashimoto et al. employed single-cell profiling to identify and characterize these specialized CD4+ T cells in supercentenarians, focusing on their expansion and functional properties.
• The result: The findings suggest that adaptive immune restructuring, exemplified by these T cells, may help manage persistent antigens and support healthy aging, offering insights into immune longevity strategies.