Loss of retrograde NGF-TrkA support could destabilize basal-forebrain cholinergic neurons early, lowering cortical acetylcholine tone and secondarily biasing APP processing and tau susceptibility. This remains plausible and clinically relevant, but current support is more inferential than decisive.
Curated pathway from expert analysis
flowchart TD
A["Cortical NGF Production<br/>Target-Derived Trophic Factor"]
B["NGF Retrograde Transport<br/>Axonal NTRK1 / TrkA Complex"]
C["Basal Forebrain Cholinergic Neurons<br/>TrkA Survival Signaling"]
D["PI3K-Akt / MAPK Survival Cascade<br/>CREB-Mediated Gene Expression"]
E["ChAT / VAChT Maintenance<br/>Cholinergic Phenotype Preservation"]
F["APP Processing Shift<br/>sAPP-alpha Neuroprotective Fragment"]
G["NGF Transport Failure<br/>TrkA-p75NTR Imbalance"]
A --> B
B --> C
C --> D
D --> E
D --> F
G -.->|"disrupts"| B
style A fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style E fill:#1b5e20,stroke:#81c784,color:#81c784
style G fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9aNo linked papers recorded for this hypothesis yet.
No curated PDB or AlphaFold mapping for NGF yet. Search RCSB →
Median TPM across 13 brain regions for NGF, NTRK1, APP 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 NGF, NTRK1, APP.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF we administer NGF (2.5 μg/day) or a TrkA agonist (e.g., 7,8-dihydroxyflavone, 20 mg/kg/day) directly into the basal forebrain of 3xTg-AD mice starting at 3 months of age for 3 months, THEN cortical | ≥40% reduction in cortical Aβ42 concentration and ≥40% reduction in phospho-tau (Ser396) levels measured by ELISA and western blot at 12 months of age. | — no observation — | pending | 0.55 |
| IF we cross 5xFAD mice with Chat-Cre;TrkA-flox/flox mice to achieve selective TrkA deletion in basal forebrain cholinergic neurons, THEN these mice will exhibit accelerated cortical amyloid plaque dep | ≥50% increase in cortical Thioflavin-S+ plaque burden and ≥2-fold increase in AT8+ neurons in cortex at 6 months of age. | — no observation — | pending | 0.45 |