Organelle-orchestrated cGAS-STING signaling and its role in neurodegeneration

The cGAS-STING signaling pathway serves as a central signalling axis of the innate immune system, and its aberrant activation plays a pivotal role in inflammatory responses. Recent studies have demonstrated that its regulation depends not only on individual organelles but also on a coordinated interorganelle network. This review systematically analyze how mitochondria, centrosomes, the endoplasmic reticulum (ER), membrane contact sites (MCSs), the Golgi apparatus, endosomes, and lysosomes collectively orchestrate cGAS-STING signaling. Mitochondria initiate signaling by releasing mitochondrial DNA; centrosomes serve as platforms for double-stranded DNA accumulation to potentiate cGAS activation; the ER anchors STING in a calcium homeostasis-dependent manner; mitochondrial-associated ER membranes (MAMs) integrate calcium and lipid signaling as regulatory checkpoints governing STING trafficking to the Golgi apparatus; the Golgi amplifies downstream signaling through site-specific post-translational modifications of STING; finally, the endosome-lysosome system, together with ER-lysosome MCSs, acts as a coordinated hub for STING sorting, lysosomal degradation and signal termination. Consequently, disruption of organelle homeostasis leads to persistent STING activation. In neurodegenerative conditions including Alzheimer's disease, Parkinson's disease, Amyotrophic lateral sclerosis and Huntington's disease, organelle dysfunction resulting from calcium overload, impaired organelle clearance, proteolytic cleavage of tethering proteins or multi-source attacks drives aberrant STING signaling. Sustained STING activity exacerbates pathological cascades such as protein misfolding, chronic neuroinflammation, and progressive neuronal loss. Therefore, therapeutic strategies targeting key regulatory nodes of the STING pathway, from upstream organelle repair to direct pharmacological inhibition, offer significant potential to mitigate disease-associated pathological progression and constitute a promising foundation for precision therapeutics in neurodegenerative disorders.