Circulating Endothelial Microvesicles Expressing Degraded Claudin-5 as Specific Markers of Early BBB Permeability
🧪 Overview
Endothelial cells shed microvesicles (EMVs) during activation or injury. EMVs from degenerating brain endothelium carry fragments of tight junction proteins (particularly degraded claudin-5), which can be immunoprecipitated from blood and quantified. These EMV-associated junction fragments specifically reflect BBB-derived permeability rather than peripheral vascular leakiness. Technical validation remains a significant challenge.
🧬 Mechanism
Curated pathway from expert analysis
flowchart TD
A["CD31+/CD144+<br/>Endothelial Microvesicles"]
B["CLDN5 Fragments<br/>on EMV Surface"]
C["EMV-Mediated<br/>Signaling"]
D["Microvascular<br/>Endothelial Activation"]
E["Pericyte<br/>Dysfunction"]
F["BBB<br/>Compromise"]
G["Neuroinflammation<br/>Progression"]
A --> B
B --> C
C --> D
D --> E
E --> F
F --> G
style A fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style B fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style G fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a⚖️ Evidence
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — CLDN5
No curated PDB or AlphaFold mapping for CLDN5 yet. Search RCSB →
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for CLDN5 fragments on CD31+/CD144+ EMVs 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 CLDN5 fragments on CD31+.
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 circulating endothelial microvesicles (EMVs) expressing degraded claudin-5 (CLDN5 fragments on CD31+/CD144+ EMVs) are a specific biomarker of paracellular BBB degradation, then CLDN5 fragment+ EMVs | EMV analysis by flow cytometry (CD31+CD144+ CLDN5 fragment+) in stratified cohorts shows: elevated CLDN5 fragment+ EMVs in paracellular dysfunction (TBI, n≥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 |