Mitochondrial DNA triggers inflammatory aging through cGAS-STING pathway

A comprehensive review has mapped out how mitochondrial dysfunction during aging creates a self-reinforcing cycle of inflammation through the cGAS-STING pathway. As mitochondria become damaged with age, their DNA increasingly leaks into the cell's cytoplasm where it's recognized as a danger signal by cGAS (cyclic GMP-AMP synthase). This triggers the STING pathway, unleashing inflammatory responses that contribute to cellular senescence and the chronic low-grade inflammation characteristic of aging, termed 'inflammaging.' The mechanistic detail provided shows this isn't just correlation—mitochondrial homeostatic disruption directly drives inflammatory and immune outcomes that accelerate aging. This pathway represents a potentially actionable target: blocking cGAS-STING signaling or improving mitochondrial quality control could break the inflammatory cycle. The review synthesizes recent findings showing how this mechanism connects multiple aging hallmarks: mitochondrial dysfunction, cellular senescence, and chronic inflammation. For the longevity field, this provides a clearer roadmap for intervention strategies, whether through mitophagy enhancers that clear damaged mitochondria, STING inhibitors currently in development, or NAD+ boosters that support mitochondrial health. Understanding this axis helps explain why interventions targeting mitochondria often have broad anti-aging effects.