What's the Secret to Living to 110? Study Reveals 4.4 Times More 'Killer T Cells'

While the human immune system typically declines with age, individuals who live past 110 appear to exhibit a different pattern. A recent study revealed a notable increase in "killer T cells" within the blood of these "supercentenarians." These cells, which are crucial for directly attacking abnormal cells, rose from approximately 4% of T cells in younger elderly individuals to 17.6% in those over 110.

The research, published in Cell Reports, analyzed blood samples from 28 Japanese individuals across three age groups: 70-99, 100-109, and over 110. The study found that the proportion of killer T cells increased with extreme age, reaching 17.6% in the over-110 group. This suggests that the immune systems of the very old may retain a capacity for ongoing adaptation.

These killer T cells remained active, with one dominant cell clone representing about one-third of the killer T cells, indicating significant replication. Researchers noted similarities between these cells and those found in patients with lung, breast, and liver cancer, speculating they might target cancer-related elements. However, the study, limited by its small sample size and inability to prove causation, requires further investigation to confirm the role of these cells in extreme longevity or cancer resistance.

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This may reflect the continued adaptive capacity of the immune system in the extremely elderly.