What happened
The team implicates STING, a molecular switch in the immune system, as a force fueling the chronic neuroinflammation seen in Alzheimer's disease. STING normally helps the body sense danger and mount a defense, but when it stays switched on in the brain, that defensive response curdles into the kind of sustained inflammation that damages neurons.
Why this matters: if a defined switch helps drive the inflammatory side of Alzheimer's, it becomes a concrete drug target. Instead of only clearing plaques, you could aim to calm the immune overreaction that may be doing much of the harm. That is a different and complementary line of attack.
It is early mechanism, not a medicine. But the shift in framing is real: Alzheimer's increasingly looks like a disease of the brain's immune system as much as its proteins. Naming the switch is how you start designing the off button.
Source
Reported by A molecular switch called STING fuels Alzheimer's inflammation via sciencedaily.com, published May 31, 2026.