Researchers identified PLA2G7, a secreted lipid-metabolizing enzyme produced by neural stem cells in the dentate gyrus, as a negative regulator of inhibitory synapses. Suppressing PLA2G7 in aged mice strengthened inhibitory synaptic transmission and improved cognitive performance, pointing to a secreted factor from the stem cell niche as a tractable target in brain aging.
Key Points
- PLA2G7 from neural stem cells suppresses inhibitory synapses in dentate gyrus
- Suppressing PLA2G7 restored inhibitory circuit function in aged mice
- Cognitive performance improved after enzyme suppression, independent of adding neurons
Longevity Analysis
Cognitive decline here is framed not as a deficit to be supplemented but as interference to be removed: a secreted enzyme actively dampening circuit function, with performance recovering once it is suppressed. The finding also links lipid handling to how the brain's regenerative niche communicates with surrounding circuitry, reinforcing that the same enzyme family tracked in vascular inflammation may shape neural signaling. Any human translation remains distant, but the principle of identifying and removing an active brake on function, rather than stimulating new cell production, has broad application across aging tissue.
Original published by Nature Aging, by Fuling Wu.