NLRP3 Inflammasome Priming Converts SCFA-Sensitive Pyroptosis into Chronic IL-1β-Mediated Synaptic Pruning
🧪 Overview
Gut-derived bacterial components (LPS, MDP) provide Signal 1 for NLRP3 inflammasome priming via TLR4/TLR2/NOD2, inducing pro-IL-1β and NLRP3 transcription. Signal 2 activation occurs through mitochondrial dysfunction from SCFA deficiency, causing ROS release and potassium efflux. Active caspase-1 cleaves pro-IL-1β and gasdermin D, executing pyroptotic cell death. Released IL-1β acts on neuronal IL-1R1 to promote complement C1q/C3-mediated synaptic pruning. SCFAs interrupt at both signals via GPR109A-mediated mitochondrial biogenesis and NF-κB inhibition.
🧬 Mechanism
Curated pathway from expert analysis
flowchart TD
A["NLRP3 Inflammasome<br/>Activation"]
B["CASP1-mediated<br/>Pro-GSDMD Cleavage"]
C["GSDMD Pore Formation<br/>Pyroptosis"]
D["IL1B Release<br/>Pro-inflammatory Cytokine"]
E["Complement C3<br/>Activation"]
F["C1QA-mediated<br/>Synaptic Pruning"]
G["GPR109A (HCAR2)<br/>Anti-inflammatory Signal"]
H["Microglial<br/>Activation"]
I["Neuroinflammation<br/>Cognitive Decline"]
A --> B
B --> C
C --> D
D --> H
E --> F
F --> I
G --> D
G --> H
style A fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style I fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a⚖️ Evidence
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — NLRP3
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for NLRP3, CASP1, GSDMD, IL1B, IL1R1, C3, C1QA, GPR109A (HCAR2) from GTEx v10.
💉 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 NLRP3, CASP1, GSDMD, IL1B, IL1R1, C3, C1QA, GPR109A (HCAR2).
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
🏆 Tournament
🏆 Arenas / Elo
📊 Market Indicators
💾 Resource Usage
No resource usage or linked notebooks recorded for this hypothesis yet.
🔮 Predictions
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF adult C57BL/6 mice are fed a diet lacking fermentable fiber (SCFA-depleted diet) for 4 weeks, THEN hippocampal complement proteins C1q and C3 will increase by >50% and synaptic density (measured by | Significant increase in C1q/C3 protein expression and increased colocalization of complement with synaptic markers; reduced dendritic spine density and synaptic | — no observation — | pending | 0.65 |
| IF NLRP3 knockout mice receive chronic SCFA depletion, THEN there will be no significant increase in hippocampal IL-1β or complement-mediated synaptic pruning compared to wild-type SCFA-depleted mice, | NLRP3 knockout mice will be protected from SCFA depletion-induced synaptic pruning, with hippocampal IL-1β and C1q levels remaining at baseline despite SCFA dep | — no observation — | pending | 0.58 |
▸Metadatasource: v1_phase_c_backfill · origin_type: debate_synthesizer
| source | v1_phase_c_backfill |
| origin_type | debate_synthesizer |
| _schema_version | 1 |