TIMP2 Reverses Age-Linked Microglial Dysfunction in 20-Month-Old Mice
Updated
Updated · Nature.com · Aug 12
TIMP2 Reverses Age-Linked Microglial Dysfunction in 20-Month-Old Mice
2 articles · Updated · Nature.com · Aug 12
Summary
Systemic TIMP2 treatment in 20-month-old mice cut microglial activation in the hippocampus and restored phagocytosis, reversing several age-associated defects seen in older brains.
Mouse experiments showed the youth-associated protein reduced CD68-positive inflammatory microglia, lowered pro-inflammatory and senescence-like subpopulations, and increased engulfment of synaptic material.
Deleting TIMP2 produced the opposite pattern: more inflammatory markers, impaired myelin and synaptic debris clearance, and higher extracellular inflammatory proteins in the hippocampus.
Microglia and neurons both contributed to TIMP2’s effects, and microglia released more TIMP2 when exposed to myelin, linking the protein to debris handling in aging brain tissue.
The study positions TIMP2, whose blood levels are higher in youth and fall with age, as a potential therapeutic target for age-related neurodegenerative disease.