How People Live Beyond 110: Rare Immune Cells May Hold the Key

A recent study discovered that individuals living past 110 years have high levels of a rare immune cell type known as CD4 cytotoxic T cells. These cells can target and destroy cancer cells, potentially aiding in longevity by combating diseases including cancer. This research was published in Cell Reports.

Supercentenarians, those aged 110 or older, often avoid serious conditions like heart disease and dementia. By examining their immune systems, scientists aim to uncover why they maintain health into old age and how these insights might benefit others. The study centered on CD4 CTLs, which typically make up less than 5% of T cells but become more prevalent with age.

Researchers compared groups: younger individuals aged 70-90, centenarians (100-109), and supercentenarians. In the youngest group, CD4 CTLs accounted for about 4% of T cells, rising to around 10% in centenarians and nearly 18% in supercentenarians. These cells often multiply to address specific threats.

The study indicated that these immune cells might target particular diseases, such as cancer, as they were more abundant in older groups. However, since the cells were identified in blood samples, their exact targets remain unclear. Some cell receptors matched those from individuals with cancer, suggesting a possible role in fighting the disease.

This research underscores the potential of CD4 CTLs in extending life and health, though further investigation is needed to fully grasp their impact.