ID: h-e67bc7eaca
Hypothesis
Amyloid-beta induces secondary pericyte senescence after contractile and oxidative stress
Soluble Aβ oligomers trigger endothelin-1 and ROS-dependent pericyte contractile stress, and repeated exposure converts this acute vasoactive injury into a secondary senescence phenotype.
EvidencePending (0%)📖 7 cit🗣 1 debates✓ 7 support✗ 2 oppose
✓ All Quality Gates Passed
🧪 Overview
Soluble Aβ oligomers trigger endothelin-1 and ROS-dependent pericyte contractile stress, and repeated exposure converts this acute vasoactive injury into a secondary senescence phenotype. In this model, pericyte senescence is downstream of amyloid toxicity but may later amplify BBB dysfunction and hypoperfusion.
🧬 Mechanism
🧬 Curated Mechanism Pathway
Curated pathway from expert analysis
flowchart TD
A["APP Full Length<br/>Membrane Protein"]
B["BACE1 Beta-Secretase<br/>Cleavage at beta-site"]
C["sAPPbeta + CTFbeta<br/>C-terminal Fragment"]
D["Gamma-Secretase Complex<br/>PSEN1/PSEN2"]
E["Abeta42 Peptide<br/>Amyloidogenic Fragment"]
F["Abeta Oligomers<br/>Toxic Aggregates"]
G["Amyloid Plaques<br/>Extracellular Deposits"]
H["ADAM10 Alpha-Secretase<br/>Non-amyloidogenic Path"]
A --> B
B --> C
C --> D
D --> E
E --> F
F --> G
A --> H
H -.->|"competes with BACE1"| B
style A fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style E fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style G fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style H fill:#1b5e20,stroke:#81c784,color:#81c784⚖️ Evidence
⚖️ Evidence Matrix7 supports2 contradicts
Supports
Aβ oligomers can constrict human capillaries via pericyte signaling and endothelin-related mechanisms, supporting a pericyte-mediated downstream injury route.
Supports
Review literature supports direct Aβ toxicity to pericytes and neurovascular dysfunction in AD.
Supports
The amyloid hypothesis of Alzheimer's disease at 25 years.
Supports
APP lysine 612 lactylation ameliorates amyloid pathology and memory decline in Alzheimer's disease.
Supports
A CHCHD6-APP axis connects amyloid and mitochondrial pathology in Alzheimer's disease.
Contradicts
The primary evidence shows contractile dysfunction, not senescence; the senescence step remains inferred rather than demonstrated.
Contradicts
Review-based support does not establish a verified temporal sequence from Aβ exposure to true pericyte senescence.
📖 Linked Papers
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — APP
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for APP/Aβ, EDN1, EDNRA, ROS 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 APP.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
💰 Estimated Development
Cost
$0
Timeline
—
🏆 Tournament
🏆 Arenas / Elo
No arena matches recorded yet. Browse Arenas →
📊 Market Indicators
7d Trend
↔
Stable
7d Momentum
▼ 0.8%
Volatility
Low
0.0031
Events (7d)
3
Price History
▼11.6%💾 Resource Usage
LLM Tokens
17,540
$0.0526
Total Cost
$0.0526
🔮 Predictions
🔎 Predictions vs Observations2 predictions · 0 with recorded observations
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF human iPSC-derived brain pericytes are exposed to 200 nM soluble Aβ42 oligomers pulsed every 48 hours for 14 days (7 exposures total), THEN SA-β-gal positive cells will increase to ≥30% and p16Ink4 | SA-β-gal positivity will reach ≥30% (vs. <5% in controls) and p16Ink4a expression will increase ≥3-fold in repeatedly Aβ42-exposed pericytes | — no observation — | pending | 0.60 |
| IF human iPSC-derived brain pericytes are treated with 500 nM soluble Aβ42 oligomers for 4 hours, THEN phospho-MLC2 (Ser19) levels will increase by ≥50% compared to vehicle-treated pericytes, indicati | Phospho-MLC2 (Ser19) will increase ≥50% in Aβ42-treated pericytes vs. vehicle control (expected ~2.5× baseline fold change) | — no observation — | pending | 0.70 |
🔮 Falsifiable Predictions (2)
pendingconf 70%
IF human iPSC-derived brain pericytes are treated with 500 nM soluble Aβ42 oligomers for 4 hours, THEN phospho-MLC2 (Ser19) levels will increase by ≥50% compared to vehicle-treated pericytes, indicating acute contractile stress activation.
Predicted outcome: Phospho-MLC2 (Ser19) will increase ≥50% in Aβ42-treated pericytes vs. vehicle control (expected ~2.5× baseline fold change)
Falsification: Phospho-MLC2 levels show no significant difference (p>0.05) or decrease in Aβ42-treated pericytes compared to vehicle controls
pendingconf 60%
IF human iPSC-derived brain pericytes are exposed to 200 nM soluble Aβ42 oligomers pulsed every 48 hours for 14 days (7 exposures total), THEN SA-β-gal positive cells will increase to ≥30% and p16Ink4a mRNA will increase ≥3-fold compared to vehicle-pulsed pericytes.
Predicted outcome: SA-β-gal positivity will reach ≥30% (vs. <5% in controls) and p16Ink4a expression will increase ≥3-fold in repeatedly Aβ42-exposed pericytes
Falsification: SA-β-gal positivity remains <10% and p16Ink4a mRNA shows no significant upregulation (fold change <1.5) despite repeated Aβ42 pulses over 14 days
▸Metadatasource: v1_phase_c_backfill · origin_type: debate_synthesizer
| source | v1_phase_c_backfill |
| origin_type | debate_synthesizer |
| _schema_version | 1 |
📊 Evidence Profile
Evidence Balance
+0%
Certainty
0%
Debates
0
Incoming
0
Outgoing
0
0 supporting
0 contradicting
0 neutral
Public annotations (0)Annotate on Hypothes.is →
No public annotations yet.