This hypothesis proposes that direct enhancement of PINK1/PARK2-mediated mitophagy in microglia will shift microglial polarization from the pro-inflammatory M1 phenotype to the anti-inflammatory M2 phenotype, thereby resolving chronic neuroinflammation through metabolic reprogramming rather than direct inflammasome inhibition. The mechanism centers on mitophagy's role in controlling microglial metabolic state and phenotypic switching. PINK1 (PTEN-induced kinase 1) accumulates on depolarized mitochondria and phosphorylates ubiquitin and the E3 ligase PARK2 (Parkin) at Ser65, creating a feed-forward amplification loop that recruits PARK2 to damaged mitochondria. PARK2 then ubiquitinates multiple mitochondrial proteins, including VDAC1, Mfn1/2, and TOM20, targeting the entire organelle for autophagosomal engulfment and lysosomal degradation. In microglia, enhanced mitophagy removes damaged, ROS-producing mitochondria that drive M1 polarization through HIF-1α stabilization and glycolytic reprogramming.
...Curated pathway from expert analysis
flowchart TD
A["DAMPs / PAMPs Detection"] --> B["NLRP3 Inflammasome Assembly"]
B --> C["Caspase-1 Activation"]
C --> D["GSDMD Cleavage"]
D --> E["Membrane Pore Formation"]
E --> F["IL-1β / IL-18 Release"]
F --> G["Pyroptotic Cell Death"]
H["NLRP3 Intervention"] --> I["Inflammasome Inhibition"]
I --> J["Blocked Pyroptosis"]
J --> K["Reduced Neuroinflammation"]
style A fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style H fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style K fill:#1b5e20,stroke:#81c784,color:#81c784No linked papers recorded for this hypothesis yet.
Median TPM across 13 brain regions for PINK1 from GTEx v10.
No clinical trials data linked to this hypothesis yet.
No curated ClinVar variants loaded for this hypothesis.
Run scripts/backfill_clinvar_variants.py to fetch P/LP/VUS variants.
No DepMap CRISPR Chronos data found for PINK1.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.