Scripps Finds STING Switch Driving Alzheimer's Inflammation, Protecting Synapses in Mice by Blocking Cysteine 148
Updated
Updated · ScienceDaily · May 31
Scripps Finds STING Switch Driving Alzheimer's Inflammation, Protecting Synapses in Mice by Blocking Cysteine 148
2 articles · Updated · ScienceDaily · May 31
Cell Chemical Biology published Scripps findings that S-nitrosylation of the STING protein acts as a molecular switch that keeps Alzheimer’s brain immune cells in an inflammatory overdrive.
Cysteine 148 was identified as the key modification site: once altered, STING clusters into larger complexes that amplify inflammatory signaling and damage neural connections.
Human Alzheimer’s postmortem brain tissue, lab-grown human brain immune cells and a mouse model all showed elevated SNO-STING, linking the pathway across experimental systems.
Amyloid-beta and alpha-synuclein could trigger the same STING modification, suggesting a self-reinforcing cycle in which protein aggregates, aging and nitric oxide sustain neuroinflammation.
Mice given a STING version that cannot be modified at cysteine 148 had lower inflammation and preserved synapses, and the team is now developing small molecules to target that site without shutting down normal immune defense.
Blocking the brain's inflammation 'switch' may protect neurons, but what are the unintended consequences of suppressing a key part of our immune system?
With multiple new ways to target brain inflammation in Alzheimer's, which therapeutic strategy will ultimately prove superior for patients?
S-Nitrosylation of STING at Cysteine 148 Drives Alzheimer’s Neurodegeneration: Implications for Precision Medicine
Overview
Groundbreaking research from Scripps Research has revealed that a specific chemical change—S-nitrosylation of the STING protein at cysteine 148—triggers chronic inflammation and the loss of synapses in Alzheimer’s disease. This modification causes STING to become pathologically overactive, pushing the brain’s immune response into overdrive. As a result, vital synaptic connections are lost, leading directly to cognitive decline. By pinpointing this precise molecular mechanism, scientists have opened the door to targeted therapies that could block this harmful process, offering new hope for protecting memory and slowing Alzheimer’s progression.