Scientists at Scripps Research have identified a precise molecular trigger for the chronic brain inflammation that destroys synapses in Alzheimer's disease. The discovery points to a potential drug target that could quiet the immune storm without disabling the brain's ability to fight infections.
The Research
The study, published April 23, 2026 in Cell Chemical Biology, centers on a protein called STING. Normally, STING acts as an early-warning system for infections, but in Alzheimer's brains, it becomes overactive. The team, led by Dr. Stuart Lipton and postdoctoral researcher Lauren Carnevale, found that STING undergoes a chemical modification called S-nitrosylation (SNO) at a specific building block, cysteine 148. This modification causes STING to cluster into inflammatory complexes, driving neuroinflammation and synapse loss.
In postmortem brain tissue from Alzheimer's patients, in human stem cell-derived models, and in a mouse model of the disease, the researchers found high levels of SNO-STING. Blocking this modification at cysteine 148 in mice reduced inflammation and protected synapses. Importantly, the approach leaves the rest of the immune system intact, unlike broad anti-inflammatory drugs.
Why It Matters
This is a precision target for Alzheimer's. Most anti-inflammatory drugs suppress the entire immune response, which can leave the brain vulnerable to infections. By targeting only the SNO modification on STING, this approach could calm the harmful inflammation while preserving normal immune function. Synapse protection is key because it's the connections between neurons that underlie memory and learning.
What You Can Do
While this research is preclinical, it highlights the role of chronic inflammation in brain health. You can support your brain by maintaining a healthy diet, exercising regularly, managing stress, and avoiding environmental toxins like air pollution—factors that can trigger S-nitrosylation. Stay tuned for future clinical trials.
Source: Neuroscience News
Curious about your own brain? Take our free adaptive IQ test or try 306 brain training levels.
