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Investigation of Macrophage Polarization Using Bone Marrow Derived Macrophages
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11,12-EET Regulates PPAR-γ Expression to Modulate TGF-β-Mediated Macrophage Polarization
Xiaoming Li1, Sebastian Kempf1, Stefan Günther2
1Institute for Vascular Signalling, Centre for Molecular Medicine, Goethe University, 60596 Frankfurt am Main, Germany.
Cells
|March 11, 2023
Summary
Transforming growth factor-beta (TGF-β) reprograms macrophages into a pro-resolving state by increasing peroxisome proliferator-activated receptor gamma (PPAR-γ) activity. However, 11,12-epoxyeicosatrienoic acid (EET) inhibits this process, impacting inflammation resolution.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Macrophages are key immune cells with adaptable phenotypes.
- Cellular microenvironments and stimuli dictate macrophage polarization.
- Understanding macrophage reprogramming is crucial for inflammation research.
Purpose of the Study:
- To investigate gene expression changes during TGF-β-induced macrophage polarization.
- To elucidate the role of PPAR-γ in TGF-β-mediated macrophage reprogramming.
- To explore the influence of soluble epoxide hydrolase (sEH) and its substrate EET on this process.
Main Methods:
- Gene expression analysis (including Pparg).
- Protein expression and activity assays for PPAR-γ.
- Macrophage phagocytosis assays.
- Experiments using sEH-deficient (sEH-/-) mice and 11,12-EET.
Main Results:
- TGF-β upregulated Pparg and its target genes, increasing PPAR-γ activity and enhancing macrophage phagocytosis.
- TGF-β-induced polarization was altered in sEH-/- macrophages, showing lower PPAR-γ-regulated gene expression.
- 11,12-EET, elevated in sEH-/- cells, inhibited TGF-β-induced PPAR-γ increases by promoting proteasomal degradation.
Conclusions:
- TGF-β drives macrophage pro-resolving polarization via PPAR-γ activation.
- sEH and its metabolite EET play a regulatory role in macrophage polarization.
- 11,12-EET negatively modulates TGF-β-induced macrophage reprogramming through PPAR-γ degradation, influencing inflammation resolution.
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