Chronic neuroinflammation is a defining feature of brain ageing and neurodegenerative disorders, yet the molecular mechanisms responsible for its persistence remain incompletely understood. Although autophagy dysfunction, glial senescence, and inflammasome activation are well-established contributors to progressive neurodegeneration, these processes are often analysed independently or through pairwise interactions, leaving their collective contribution to persistent neuroinflammation and disease progression insufficiently defined. Here, we synthesise emerging evidence supporting an integrated 'Autophagy-Senescence-Inflammasome (ASI) axis', in which reciprocal interactions among impaired autophagy, senescent glia, and inflammasome signalling establish a self-sustaining cycle of neuroinflammation. We discuss how defective autophagy promotes mitochondrial dysfunction, oxidative stress, and danger signalling, while senescent astrocytes and microglia amplify inflammatory responses through the senescence-associated secretory phenotype (SASP). These intertwined processes converge on chronic inflammasome activation, with mitochondrial dysfunction emerging as a central mechanistic hub. Evidence across Alzheimer's disease, Parkinson's disease, amyotrophic lateral sclerosis, multiple sclerosis, stroke, and chronic neuropathic pain highlight the broad relevance of this pathological network. We further analyse current therapeutic strategies targeting autophagy, senescence, and inflammasome pathways, emphasising the limitations of single-target approaches and the potential of multi-target interventions. By integrating these processes into a unified framework, this review provides new insights into the possible molecular mechanisms underlying neuroinflammaging and identifies the 'ASI axis' as a promising target for neurodegenerative disease-modifying therapies.
