Mechanisms of Mitochondrial DNA Leakage as Primary Upstream Catalysts for NLRP3 Inflammasome Activation in Neurodegenerative Pathology: A Systematic Review

Chronic neuroinflammation drives progressive neurodegenerative pathology, including Alzheimer and Parkinson diseases. While the NOD-like receptor pyrin domain-containing protein 3 (NLRP3) inflammasome is a central mediator of this response, its upstream, nonlinear activation mechanics remain poorly defined. Recent studies suggest that the translocation of damaged mitochondrial DNA (mtDNA) into the cytosol serves as a critical immunogenic catalyst bridging metabolic stress with inflammatory cascades. Following PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) 2020 guidelines, a systematic review was conducted across PubMed, Embase, and Scopus for primary experimental studies. Eligibility focused on quantitative metrics of cytosolic mtDNA leakage and subsequent NLRP3 conformational assembly kinetics in neurodegenerative models. The data demonstrate that chronic oxidative stress and toxic protein aggregation induce mitochondrial outer membrane permeabilization via BCL2-associated X protein/BCL2 antagonist/killer 1 (BAX/BAK) macropores. The resulting efflux of oxidized mtDNA (8-OHdG) escapes cytoplasmic exonuclease degradation, binding directly to the leucine-rich repeat domain of NLRP3 to trigger enzymatic activation. This synthesis establishes that mtDNA leakage acts as a distinct, cooperative biochemical switch rather than a linear cascade. Characterizing these nonlinear threshold dynamics bridges clinical pathology with predictive systems biology, providing the quantitative parameters necessary to constrain advanced computational models of early-stage neurodegeneration.

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