N-acetylcysteine (NAC) / System Xc⁻ - Mediated GSH Support for Neurovascular Unit Protection
🧪 Overview
NAC serves as a GSH precursor and direct antioxidant to inhibit ferroptosis in cerebral microvascular endothelial cells and astrocyte end-feet, preserving tight junction integrity and AQP4 polarization to prevent BBB disruption and edema after cardiac arrest. This is the most translationally credible strategy given NAC's established safety profile, clinical familiarity in critical care, and demonstrated rescue of ferroptosis via GSH precursor pathways. Mechanism attribution to SLC7A11 requires genetic validation (endothelial-specific knockout), but even non-specific antioxidant effects are therapeutically relevant. Preferred compound is NAC itself over unapproved NACA analogs.
🧬 Mechanism
Curated pathway from expert analysis
flowchart TD
A["SLC7A11/System Xc-<br/>Cystine-Glutamate Antiporter"]
B["Cystine Import<br/>Glutathione Precursor Supply"]
C["Glutathione Synthesis<br/>GPX4 Antioxidant Capacity"]
D["Lipid Peroxide Detoxification<br/>Ferroptosis Restraint"]
E["Endothelial Tight Junctions<br/>Barrier Integrity Preserved"]
F["AQP4 Polarization<br/>Astrocyte End-foot Support"]
G["Neurovascular Unit Protection<br/>Reduced BBB Leakage"]
H["SLC7A11 Failure<br/>Oxidative Stress and Ferroptosis"]
A --> B
B --> C
C --> D
D --> E
D --> F
E --> G
F --> G
H -.->|"impairs"| A
style A fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style G fill:#1b5e20,stroke:#81c784,color:#81c784
style H fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a⚖️ Evidence
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — SLC7A11
No curated PDB or AlphaFold mapping for SLC7A11 yet. Search RCSB →
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for SLC7A11 (system Xc⁻) / GSH metabolism 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 SLC7A11 (system Xc⁻).
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
🏆 Tournament
🏆 Arenas / Elo
📊 Market Indicators
💾 Resource Usage
🔮 Predictions
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF C57BL/6 mice are treated with NAC (150 mg/kg i.p.) at 15 minutes after asphyxia-induced cardiac arrest and survive 24 hours, THEN cerebral cortical GSH levels will be ≥40% higher AND 4-HNE immunore | Increased GSH (≥1.4-fold) and decreased 4-HNE (≤0.5-fold) in cerebral cortex at 24h post-arrest | — no observation — | pending | 0.65 |
| IF NAC (150 mg/kg i.p.) is administered at 15 minutes after cardiac arrest in endothelial-specific SLC7A11 knockout mice (Slco1c1-CreERT2;Slc7a11flox/flox, induced with tamoxifen 2 weeks prior), THEN | Significantly worse BBB leakage (EvB extravasation ≥1.6-fold higher) in endothelial Slc7a11 KO despite NAC treatment | — no observation — | pending | 0.45 |
▸Metadatasource: v1_phase_c_backfill · origin_type: debate_synthesizer
| source | v1_phase_c_backfill |
| origin_type | debate_synthesizer |
| _schema_version | 1 |