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Published on: January 30, 2014
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Astrocytic ET-1 System Determines Microglia Phenotype Following Spinal Cord Injury
Bingqiang He1,2, Si Xu1, Mengdi Li1
1Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education, Co-innovation Center of Neuroregeneration, Nantong University, 19 Qixiu Road, Nantong, 226001, P.R. China.
Summary
Spinal cord injury triggers astrocytic endothelin-1 (ET-1) system activation, promoting harmful M1 microglia polarization. Targeting this ET-1 system with inhibitors improves locomotor function recovery in rats.
Area of Science:
- Neuroscience
- Immunology
- Regenerative Medicine
Background:
- Microglia/macrophages adopt a pro-inflammatory M1 phenotype post-spinal cord injury (SCI), exacerbating tissue damage.
- This M1 polarization is a critical factor influencing functional outcomes after SCI.
Purpose of the Study:
- To elucidate the role of the astrocytic endothelin-1 (ET-1) system in microglia polarization following SCI.
- To identify the upstream activators and downstream signaling pathways involved in astrocytic ET-1 system activation.
- To evaluate the therapeutic potential of targeting the astrocytic ET-1 system for SCI recovery.
Main Methods:
- Investigated the activation of the astrocytic ET-1 system immediately after SCI in a rat model.
- Utilized pharmacological inhibitors for protease-activated receptor-1 (PAR-1) and ET-1.
- Assessed microglia phenotype (M1/M2), ET-1 plasma levels, and locomotor function recovery.
Main Results:
- Astrocytic ET-1 system activation drives M1 microglia polarization and suppresses M2 phenotype via YAP activation.
- SCI-induced thrombin activates the astrocytic ET-1 system through PAR-1 signaling pathways.
- Inhibition of PAR-1 and ET-1 effectively reversed M1 microglia phenotype and improved locomotor function in rats.
Conclusions:
- A novel mechanism involving the astrocytic ET-1 system in M1 microglia/macrophage accumulation post-SCI was uncovered.
- The astrocytic ET-1 system, activated by thrombin, represents a potential therapeutic target for neuroinflammation and functional recovery after SCI.
