ID: h-62cdecaacc
Hypothesis
HSP70/HSP40 Chaperone Complex Secretion
Healthy astrocytes release HSP70-HSP40 chaperone complexes that enter motor neurons and prevent stress-induced RBP aggregation by stabilizing ribosomal assembly and inhibiting stress granule nucleation.
EvidencePending (0%)📖 0 cit🗣 1 debates✓ 3 support✗ 2 oppose
✓ All Quality Gates Passed
🧪 Overview
Healthy astrocytes release HSP70-HSP40 chaperone complexes that enter motor neurons and prevent stress-induced RBP aggregation by stabilizing ribosomal assembly and inhibiting stress granule nucleation. VCP-mutant astrocytes show ER stress-induced secretion defects reducing HSP70 release. The hypothesis is weakened by thin evidence that extracellular HSP70 enters neurons in sufficient amounts to directly suppress intracellular aggregation.
🧬 Mechanism
🧬 Curated Mechanism Pathway
Curated pathway from expert analysis
flowchart TD
A["VCP/p97 AAA+ ATPase<br/>CHIP-Dependent Degradation Complex"]
B["ER-Associated Degradation (ERAD)<br/>Ubiquitinated Substrate Extraction"]
C["AGFG1 and ArfGAP1 Interaction<br/>Vesicle Trafficking and Autophagosome Maturation"]
D["TDP-43 and FUS Extraction<br/>Nuclear Quality Control Failure Compensation"]
E["VCP Mutation (Multisystem Proteinopathy)<br/>Degeneration of Neurons and Muscle"]
F["Inclusion Body Myopathy and Frontotemporal Dementia<br/>Pathologic Aggregate Accumulation"]
G["VCP Inhibitor Therapeutic Strategy<br/>Preclinical Validation Needed"]
A --> B
B --> C
C --> D
E --> F
F --> G
style A fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style F fill:#b71c1c,stroke:#ef9a9a,color:#ef9a9a
style G fill:#1b5e20,stroke:#81c784,color:#81c784⚖️ Evidence
⚖️ Evidence Matrix3 supports2 contradicts
Contradicts
Extracellular HSP70 effects are often immunomodulatory or receptor-mediated rather than acting as bulk intracellular chaperone replacement
Contradicts
Protease-treat CM to destroy free proteins but preserve EVs; if rescue persists, soluble HSPs are unlikely to be central
📖 Linked Papers
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — HSPA1A;
No curated PDB or AlphaFold mapping for HSPA1A; yet. Search RCSB →
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for HSPA1A; DNAJB family 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 HSPA1A; DNAJB family.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
💰 Estimated Development
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🔮 Predictions
🔎 Predictions vs Observations2 predictions · 0 with recorded observations
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF VCP-mutant astrocytes (derived from patients with VCP-related disease) are cultured under standard conditions for 48 hours, THEN the concentration of extracellular HSP70/HSP40 complexes in the cond | At least 30% reduction in secreted HSP70 (and co‑chaperone DNAJB1) levels in VCP‑mutant astrocyte-conditioned medium as quantified by ELISA. | — no observation — | pending | 0.55 |
| IF primary mouse motor neurons are treated with recombinant HSP70‑HSP40 complex (1 µg/mL) and exposed to oxidative stress (0.5 mM H₂O₂) for 24 hours, THEN the number of TDP‑43 or FUS aggregates per ne | ≥40% decrease in immunofluorescently counted RBP aggregate foci per neuron and ≥20% improvement in neuronal viability (MTT assay) in HSP70‑HSP40‑treated culture | — no observation — | pending | 0.45 |
🔮 Falsifiable Predictions (2)
pendingconf 55%
IF VCP-mutant astrocytes (derived from patients with VCP-related disease) are cultured under standard conditions for 48 hours, THEN the concentration of extracellular HSP70/HSP40 complexes in the conditioned medium will be significantly lower (≥30% reduction) compared to healthy astrocytes, within 4
Predicted outcome: At least 30% reduction in secreted HSP70 (and co‑chaperone DNAJB1) levels in VCP‑mutant astrocyte-conditioned medium as quantified by ELISA.
Falsification: No significant reduction (≤10% change) or an increase in extracellular HSP70/HSP40 levels in VCP‑mutant astrocytes relative to healthy controls.
pendingconf 45%
IF primary mouse motor neurons are treated with recombinant HSP70‑HSP40 complex (1 µg/mL) and exposed to oxidative stress (0.5 mM H₂O₂) for 24 hours, THEN the number of TDP‑43 or FUS aggregates per neuron will be reduced by at least 40% relative to untreated stressed neurons, within 72 hours after t
Predicted outcome: ≥40% decrease in immunofluorescently counted RBP aggregate foci per neuron and ≥20% improvement in neuronal viability (MTT assay) in HSP70‑HSP40‑treat
Falsification: No reduction (≤10% change) or an increase in RBP aggregates, or no improvement in neuronal viability after HSP70‑HSP40 treatment under stress.
▸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
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