Youth-associated protein reverses age-related microglial changes in mice

Researchers at The Icahn School of Medicine at Mount Sinai have identified a role for the youth-associated protein TIMP2 in supporting the healthy function of microglia, the brain's resident immune cells.

In a study published August 12 in Nature Communications [https://doi.org/10.1038/s41467-026-74906-z], they found that loss of TIMP2 caused microglia to develop several features associated with aging and neurodegeneration. Conversely, restoring TIMP2 in the blood of aged mice improved the ability of microglia to clear debris and reduced molecular markers associated with inflammation and other maladaptive states.

The findings provide new insight into how youth-associated factors may influence the aging brain and suggest that TIMP2 may help maintain healthy immune function in the brain as organisms age.

Aging is the strongest known risk factor for Alzheimer's disease and other neurodegenerative disorders, yet the biological changes that make the aging brain more vulnerable to disease are not fully understood. Microglia play an essential role in maintaining brain health by clearing cellular debris, supporting neural circuits, and responding to injury. With age, however, microglia can become less efficient and adopt states that may contribute to inflammation and impaired brain function.