ID: h-af33e758af
Hypothesis
Prostacyclin (PGI2) Signaling via IP Receptor
Healthy astrocytes produce prostaglandin I2 (prostacyclin), which signals via IP receptor on motor neurons, elevating cAMP-PKA signaling and promoting RBP phosphorylation to prevent aberrant phase separation.
EvidencePending (0%)📖 0 cit🗣 1 debates✓ 3 support✗ 3 oppose
✓ All Quality Gates Passed
🧪 Overview
Healthy astrocytes produce prostaglandin I2 (prostacyclin), which signals via IP receptor on motor neurons, elevating cAMP-PKA signaling and promoting RBP phosphorylation to prevent aberrant phase separation. Hypoxic astrocytes have COX-2 downregulation reducing PGI2 synthesis. This is the most speculative hypothesis with too many unsupported mechanistic steps.
🧬 Mechanism
🧬 Curated Mechanism Pathway
Curated pathway from expert analysis
flowchart TD
A["PTGIR/IP Receptor<br/>Prostacyclin Signaling"]
B["PTGS2/COX-2<br/>Prostaglandin Production"]
C["Vasodilation<br/>Blood Flow Enhancement"]
D["Neurovascular Coupling<br/>Restoration"]
E["Platelet Aggregation<br/>Inhibition"]
F["Cerebral Perfusion<br/>Improved"]
G["PTGIR/PTGS2 as<br/>Vascular Target"]
A --> B
B --> C
C --> D
D --> E
E --> F
G -.->|"enhances"| C
style A fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style F fill:#1b5e20,stroke:#a5d6a7,color:#a5d6a7⚖️ Evidence
⚖️ Evidence Matrix3 supports3 contradicts
Contradicts
The mechanistic chain hypoxia→COX-2 downregulation→less PGI2→less cAMP/PKA→less RBP phosphorylation→rescue is too many unsupported steps
Contradicts
Eicosanoid signaling in astrocytes under hypoxia/injury is complex and shifts toward inflammatory outputs; the specific PGI2 deficit story is not anchored to this paper
Contradicts
Direct quantification of 6-keto-PGF1α and stable PGI2 analog rescue have not been demonstrated
📖 Linked Papers
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — PTGIR
No curated PDB or AlphaFold mapping for PTGIR yet. Search RCSB →
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for PTGIR (IP receptor); PTGS2 (COX-2) 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 PTGIR (IP receptor); PTGS2 (COX-2).
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
↗
Rising
7d Momentum
▲ 1.6%
Volatility
Medium
0.0329
Events (7d)
3
Price History
▲31.6%💾 Resource Usage
LLM Tokens
10,463
$0.0314
Total Cost
$0.0314
🔮 Predictions
🔎 Predictions vs Observations2 predictions · 0 with recorded observations
| Prediction | Predicted | Observed | Status | Conf |
|---|---|---|---|---|
| IF PTGIR (IP receptor) is genetically knocked out via CRISPR-Cas9 in motor neurons co-cultured with healthy wild-type astrocytes THEN motor neurons will display elevated aberrant phase separation phen | ≥50% increase in cytoplasmic RBP foci; ≥40% reduction in RBP serine/threonine phosphorylation; loss of cAMP-PKA activation in response to exogenous PGI2 | — no observation — | pending | 0.20 |
| IF primary motor neurons are co-cultured with astrocytes under hypoxic conditions (1% O2, 24 hours) THEN motor neurons will exhibit significantly decreased cAMP-PKA signaling (≥30% reduction in cAMP l | ≥30% decrease in intracellular cAMP; ≥40% increase in stress granule formation or cytoplasmic RBP foci; decreased PKA catalytic subunit phosphorylation | — no observation — | pending | 0.25 |
🔮 Falsifiable Predictions (2)
pendingconf 25%
IF primary motor neurons are co-cultured with astrocytes under hypoxic conditions (1% O2, 24 hours) THEN motor neurons will exhibit significantly decreased cAMP-PKA signaling (≥30% reduction in cAMP levels) and increased aberrant liquid-liquid phase separation of RNA-binding proteins (RBP) compared
Predicted outcome: ≥30% decrease in intracellular cAMP; ≥40% increase in stress granule formation or cytoplasmic RBP foci; decreased PKA catalytic subunit phosphorylatio
Falsification: Motor neurons under hypoxic co-culture show no change or increased cAMP-PKA signaling and no increase in RBP phase separation compared to normoxic controls, disproving the astrocyte-derived PGI2-IP re
pendingconf 20%
IF PTGIR (IP receptor) is genetically knocked out via CRISPR-Cas9 in motor neurons co-cultured with healthy wild-type astrocytes THEN motor neurons will display elevated aberrant phase separation phenotypes and decreased RBP phosphorylation despite the presence of astrocyte-derived PGI2, within 72 h
Predicted outcome: ≥50% increase in cytoplasmic RBP foci; ≥40% reduction in RBP serine/threonine phosphorylation; loss of cAMP-PKA activation in response to exogenous PG
Falsification: IP receptor knockout motor neurons show normal RBP phosphorylation and no aberrant phase separation when co-cultured with healthy astrocytes, indicating IP receptor is not required for astrocyte-media
▸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.