STING-Mediated NLRP3 Inflammasome Priming in ALS Microglia
🧪 Overview
This hypothesis proposes that cytoplasmic mtDNA released from TDP-43-damaged mitochondria in ALS activates the cGAS-STING pathway in microglia, which subsequently primes and hyperactivates the NLRP3 inflammasome through IRF3-mediated transcriptional upregulation and direct STING-NLRP3 protein interactions. The molecular mechanism begins with TDP-43 aggregation disrupting mitochondrial homeostasis, leading to mtDNA leakage into the cytoplasm where it binds cGAS. Activated cGAS synthesizes cGAMP, which binds STING and triggers its oligomerization and translocation from the ER to perinuclear puncta. STING activation then occurs through two convergent pathways: (1) canonical IRF3/NF-κB signaling that transcriptionally upregulates NLRP3, pro-IL-1β, and pro-IL-18 expression (priming signal), and (2) direct STING-NLRP3 physical interaction at ER-mitochondrial contact sites that facilitates NLRP3 oligomerization and inflammasome assembly (activation signal). This dual STING-mediated mechanism amplifies microglial NLRP3 inflammasome activity, resulting in excessive caspase-1 activation and IL-1β/IL-18 secretion that drives chronic neuroinflammation and motor neuron death.
...🧬 Mechanism
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:#81c784⚖️ Evidence
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — TMEM173
No curated PDB or AlphaFold mapping for TMEM173 yet. Search RCSB →
💉 Clinical Trials
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 TMEM173.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
🏆 Tournament
🏆 Arenas / Elo
📊 Market Indicators
💾 Resource Usage
▸Metadatasource: v1_phase_c_backfill · origin_type: gap_debate
| source | v1_phase_c_backfill |
| origin_type | gap_debate |
| _schema_version | 1 |