Supercentenarians (110+ yrs)
Marked by robust clonal cytotoxic CD4+ expansion possessing granzyme B & perforin machinery.
Typical Elderly (75-85 yrs)
Exhausted phenotype (PD-1+/TIGIT+) with severe loss of helper T cell cytotoxic conversion.
High Robustness: Cytotoxic CD4+ expansion maintains active tumor and senescent clearance with minimal immunosenescence exhaustion.
| Cohort | CD4+ CTL % | Granzyme B | Exhaustion | Cancer Clearance | Status |
|---|---|---|---|---|---|
| Supercentenarians (110+) | 25.4% | 0.88 | 0.22 | 96.4% | Exceptional |
| Typical Elderly (75-85) | 2.8% | 0.35 | 0.68 | 42.1% | Vulnerable |
| Centenarians (100-104) | 14.2% | 0.62 | 0.45 | 76.8% | Resilient |
| Young Adults (20-30) | 4.1% | 0.75 | 0.12 | 88.5% | Homeostatic |
Discovery in Supercentenarians: Single-cell RNA sequencing revealed that supercentenarians have a unique accumulation of CD4+ T-cells that possess cytotoxic characteristics—normally restricted to CD8+ T cells. They produce large amounts of Granzyme B and Perforin, enabling immune elimination of mutated oncogenic clones and senescent inflammatory cells without developing immune exhaustion.