Youthful TIMP2 Revives Brain Microglia Function in Mice

A youth-associated protein TIMP2 helps brain-resident immune cells (microglia) maintain debris-clearing function and limit inflammatory aging. In aging mice, removing TIMP2 causes microglia to adopt aging-like traits and higher inflammatory signals; conversely, systemic TIMP2 administration improves debris clearance and reduces inflammatory markers, suggesting youth factors can influence brain aging and may inform strategies for neurodegenerative diseases, though human relevance remains to be tested.