Soluble LRP1 (sLRP1) Ectodomain Shedding as a Blood-Based Indicator of Impaired Aβ Clearance Across the BBB
🧪 Overview
LRP1 mediates Aβ export from brain to blood at the BBB. Metalloprotease-mediated shedding of the LRP1 ectodomain (sLRP1) generates circulating fragments that retain Aβ-binding capacity but lack transmembrane signaling. Elevated sLRP1 indicates LRP1 dysfunction and impaired Aβ clearance, occurring before amyloid plaque formation. This hypothesis links Aβ clearance mechanisms directly to BBB dysfunction.
🧬 Mechanism
Curated pathway from expert analysis
flowchart TD A["Metalloprotease Activation"] --> B["LRP1 Ectodomain Shedding"] B --> C["sLRP1 Elevation in Blood"] C --> D["LRP1 Dysfunction at BBB"] D --> E["Impaired Abeta Transcytosis"] E --> F["Reduced Abeta Clearance from Brain"] F --> G["Abeta Accumulation in Brain"] D --> H["BBB Endothelial Dysfunction"] G --> I["Amyloid Plaque Formation"] H --> I G --> J["Neuronal Toxicity"] J --> K["Cognitive Decline"] I --> K F --> J G["Abeta Accumulation in Brain"] --> L["Memory Impairment"] K["Cognitive Decline"] --> M["AD Progression"]
⚖️ Evidence
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — LRP1
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for LRP1 (LDL Receptor Related Protein 1) 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 LRP1 (LDL Receptor Related Protein 1).
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 soluble LRP1 (sLRP1) ectodomain shedding indicates impaired LRP1-mediated Aβ clearance at the BBB, then elevated plasma sLRP1 will predict reduced CSF/plasma Aβ42 ratio and slower Aβ clearance rate | In AD/MCI patients (n≥80), high plasma sLRP1 (top quartile) correlates with reduced CSF/plasma Aβ42 ratio (r<-0.45), decreased peripheral Aβ clearance rate (40- | — no observation — | pending | 0.73 |
▸Metadatasource: v1_phase_c_backfill · origin_type: gap_debate
| source | v1_phase_c_backfill |
| origin_type | gap_debate |
| _schema_version | 1 |