Longevity & AgingBlocking PD-L2 Clears Senescent Cells and Restores Metabolic Function in Aging
Senescent cells accumulate with age and drive metabolic decline, muscle weakness, and other age-related disorders. Researchers discovered that these cells hijack a well-known cancer immune escape mechanism — the PD-L2 checkpoint — to avoid being cleared by the immune system. In aged mice lacking the PD-L2 gene, fewer senescent cells accumulated, and the animals showed better insulin sensitivity and greater grip strength compared to normal old mice. Treating aged wild-type mice with an anti-PD-L2 antibody also restored insulin sensitivity. Importantly, existing senolytic drugs — which kill senescent cells directly — can remove the high-PD-L2-expressing cells that accumulate with age. This work identifies PD-L2 as a critical survival mechanism for senescent cells and opens a new therapeutic avenue for combating age-related metabolic and physical decline.
