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FOXP3+ Macrophage-Derived Amphiregulin Promotes White Matter Repair of Experimental Autoimmune Encephalomyelitis
Shilin Wu1, Shishi Shen1, Wenxuan Sun1
1Department of Neurology, Mental and Neurological Disease Research Center, the Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
Abstract:
Multiple sclerosis (MS) is characterized by episodes of inflammatory demyelination followed by varying degrees of remyelination. Macrophages play a pivotal role in both processes. Understanding how macrophages modulate their plasticity to facilitate remyelination in MS holds significant therapeutic potential, yet this mechanism remains poorly understood. In this study, we demonstrate that the digestion of myelin debris by macrophages triggers the activation of FOXP3 signaling, which induces a pro-regenerative phenotype. Specifically, we generated macrophage-specific Foxp3 conditional knockout mice and show that FOXP3+ macrophages promote oligodendrocyte progenitor cell differentiation by producing amphiregulin (AREG), a neurotrophic factor. This mechanism enhances recovery in experimental autoimmune encephalomyelitis. These findings suggest that FOXP3+ macrophages could serve as a promising therapeutic target in MS.
Insights
Macrophages that digest myelin debris in multiple sclerosis (MS) activate FOXP3 signaling, promoting nerve repair. This discovery highlights FOXP3+ macrophages as a potential therapeutic target for MS recovery.
Area of Science:
- Neuroimmunology
- Cellular plasticity in demyelinating diseases
Background:
- Multiple sclerosis (MS) involves inflammatory demyelination and remyelination.
- Macrophages are key players in both demyelination and remyelination.
- The plasticity of macrophages in promoting MS remyelination is not well understood.
Purpose of the Study:
- To investigate the role of FOXP3 signaling in macrophage plasticity during MS.
- To identify mechanisms by which macrophages facilitate remyelination in MS.
Main Methods:
- Generated macrophage-specific Foxp3 conditional knockout mice.
- Analyzed the impact of FOXP3 signaling on macrophage phenotype and function.
- Assessed the effect of FOXP3+ macrophages on oligodendrocyte progenitor cell differentiation and experimental autoimmune encephalomyelitis (EAE) recovery.
Main Results:
- Digestion of myelin debris by macrophages activates FOXP3 signaling.
- FOXP3 signaling induces a pro-regenerative macrophage phenotype.
- FOXP3+ macrophages enhance oligodendrocyte progenitor cell differentiation via amphiregulin (AREG) production.
- This mechanism improves recovery in experimental autoimmune encephalomyelitis.
Conclusions:
- FOXP3+ macrophages play a crucial role in promoting remyelination and recovery in MS.
- Macrophage-derived amphiregulin (AREG) mediates the pro-regenerative effects.
- Targeting FOXP3+ macrophages represents a potential therapeutic strategy for MS.
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