cGAS-STING
cGAS-STING is the cell's alarm for DNA in the wrong place. Damaged genomes and failing mitochondria set it off with age, and its chronic activation is a leading explanation for how damage in single cells becomes body-wide inflammation. Blocking it calmed age-related inflammation in old mice, but nothing targeting it has been tested in people for aging.
There is nothing to take for this pathway: no drug or supplement aimed at it has been tested in people for aging. Treat it as a research target, not a treatment.
What it is
cGAS-STING (named after its two parts: the DNA sensor cyclic GMP-AMP synthase, and STING, short for stimulator of interferon genes) is a sensor inside the cell, essentially a burglar alarm that watches for DNA in the wrong place. DNA normally lives inside the nucleus or inside mitochondria (the cell's power plants). The cell interprets DNA floating loose in the cytoplasm, the cell's main interior fluid, as evidence of a virus, and cGAS-STING responds by switching on a powerful antiviral and inflammatory program.[1]
A brief burst of this signalling is useful: it helps clear out damaged and pre-cancerous cells. The problem is chronic, low-level activation that never resolves.
Where the stray DNA comes from
Two age-related failures set the alarm off without any virus present.
- Ruptured micronuclei. When chromosomes are mis-sorted during cell division, the strays get wrapped in their own little micronuclei, small, fragile secondary nuclei whose flimsy envelopes can rupture and spill DNA into the cytoplasm. In cultured cells, micronuclei end up with too little of a nuclear-transport protein called RCC1, keep swelling, and develop gaps in their supporting shell that let them burst.[2]
- Leaking mitochondria. Damaged mitochondria leak their own DNA, which the same sensor detects. See mitochondrial dysfunction.
Much of the detailed mechanism behind both routes comes from cancer immunology.[3]
The body also has an off-switch, an enzyme called TREX1 (three-prime repair exonuclease 1) that mops up stray DNA before the alarm trips. How it changes with age is unsettled: levels are lower in the blood of older people (more so in autoimmune disease) and in senescent cells, but higher in the aged liver and brain. Whether a failing off-switch drives age-related inflammation is still an open question.[4]
The aging evidence: strong in mice, untested in people
The pathway has been tested directly in aging animals. In naturally old mice, DNA released from faltering mitochondria switched on the alarm in the brain's aged immune cells. Eight weeks of an experimental STING-blocking drug, H-151, reduced age-related inflammation in several organs and the brain, improved tissue function, and improved grip strength and treadmill endurance. The same drug damped inflammatory signals from senescent human cells and from fat-tissue samples taken from people with obesity, but it has not been given to living people.[5]
Sustained cGAS-STING signalling is sometimes called an "inflammatory clock", because it drives the persistent, low-grade inflammation of inflammaging. The phrase comes from a review of the aging ovary. It is a metaphor rather than a measured clock, and the authors note that much of their ovarian model is itself borrowed from other tissues and still needs direct testing.[6]
Drugs aimed at it
The strategy under discussion for aging is pulsed dosing of cGAS or STING inhibitors, which would preserve the pathway's useful clean-up role while preventing chronic inflammation.[7] For aging this is still animal work.
The only human trial so far is not about aging. VENT-03, a drug listed as targeting cGAS, is in a small placebo-controlled trial in about 24 adults with skin lupus, an autoimmune disease.[8]
What to do
- Don't buy anything for this pathway. No intervention targeting cGAS-STING has been tested in people for aging.
- Read headlines about it as mouse results. The best aging evidence is the old-mouse study above, and the pathway also does useful work in clearing damaged cells, so switching it off is not a free action.
Further reading
- Gulen MF, et al. cGAS-STING drives ageing-related inflammation and neurodegeneration. Nature 2023.[9]
- Jones KM, et al. The intersection of TREX1, cGAS, STING and the DNA damage theory of aging. Front Aging 2025.[10]
- Zych MG, et al. RCC1 depletion drives protein transport defects and rupture in micronuclei. J Cell Biol 2026.[11]
- Ma Y, et al. The inflammatory clock: how cGAS-STING ticks in the aging ovary. Front Cell Dev Biol 2026.[12]