Mount Sinai researchers reported that systemic TIMP2 injections in aged mice pushed microglia away from pro-inflammatory states and improved their ability to clear cellular debris.
Nature Communications data showed the youth-associated protein supports microglial function: removing TIMP2 made the cells resemble aged or injured microglia, with weaker debris clearance and senescence-linked molecular signatures.
In vivo microdialysis also found higher inflammatory and stress-related proteins in the brain’s extracellular environment when TIMP2 was absent, tying the protein to healthier immune activity in aging brains.
The findings offer a possible link between youth-associated blood factors and lower neurodegeneration risk, but the work was done in mice and any human therapeutic use remains unproven.