CYP2J2-Derived DHA Epoxides Modulate Microglial M2 Polarization to Reduce Neuroinflammatory Aβ Clearance Dysfunction
🧪 Overview
This hypothesis proposes that CYP2J2-derived DHA epoxides primarily function by promoting microglial M2 polarization rather than directly protecting synaptic membranes from Aβ-induced rigidification. Microglia are the primary phagocytic cells responsible for Aβ clearance, and their dysfunction contributes significantly to Alzheimer's disease pathogenesis. Evidence suggests that DHA epoxides, particularly 19,20-EpDPE, activate PPAR-γ signaling pathways that promote anti-inflammatory M2 microglial phenotypes (pmid:28483571). M2-polarized microglia exhibit enhanced phagocytic capacity and produce anti-inflammatory cytokines like IL-10 and TGF-β, facilitating more efficient Aβ clearance compared to pro-inflammatory M1 microglia. Supporting this mechanism, 5xFAD mice supplemented with DHA show increased microglial IL-10 expression and reduced TNF-α levels alongside improved Aβ clearance (pmid:29982765). The microglial target explains why sEH inhibition proves beneficial: stabilizing CYP2J2-derived epoxide levels maintains sustained microglial M2 polarization signals.
...🧬 Mechanism
Curated pathway from expert analysis
flowchart TD
A["DHA Substrate Pool<br/>Membrane Omega-3 Lipids"]
B["CYP2J2 Epoxygenase<br/>DHA-to-Epoxide Conversion"]
C["Epoxy-DHA Mediators<br/>Anti-inflammatory Lipid Signals"]
D["sEH Inhibition<br/>Epoxide Lifetime Prolonged"]
E["Synaptic Membrane Fluidity<br/>A-beta-Induced Rigidification Blocked"]
F["Excitatory Signaling Stability<br/>Receptor Mobility Preserved"]
G["Synaptic Protection<br/>Reduced A-beta Toxicity"]
A --> B
B --> C
D --> C
C --> E
E --> F
F --> G
style A fill:#1a237e,stroke:#4fc3f7,color:#4fc3f7
style D fill:#7b1fa2,stroke:#ce93d8,color:#ce93d8
style G fill:#1b5e20,stroke:#81c784,color:#81c784⚖️ Evidence
No linked papers recorded for this hypothesis yet.
🏥 Translation
🧬 3D Protein Structure — CYP2J2
No curated PDB or AlphaFold mapping for CYP2J2 yet. Search RCSB →
🧠 GTEx v10 Brain ExpressionJSON
Median TPM across 13 brain regions for CYP2J2/microglial PPAR-γ 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 CYP2J2.
Run python3 scripts/backfill_hypothesis_depmap.py to populate.
🏆 Tournament
🏆 Arenas / Elo
📊 Market Indicators
💾 Resource Usage
▸Metadatasource: v1_phase_c_backfill · origin_type: gap_debate
| source | v1_phase_c_backfill |
| origin_type | gap_debate |
| _schema_version | 1 |