肌肉中的Nrf2缺乏减弱了实验性自身免疫性肌肉炎诱导的肌肉虚弱
Koichi Himori1, Mami Yamada1, Takahiro Onoki2
1Graduate School of Science, Nagoya City University, Nagoya, Japan.
The Journal of physiology
|October 21, 2024
概括
实验性自身免疫性肌肉炎 (EAM) 通过增加T淋巴细胞透和炎症性细胞因子,导致肌肉疲软. 向 肌肉中的核因素红色素2相关因子2 (Nrf2) 活性显示为治疗EAM诱导的肌肉衰弱有前途.
科学领域:
- 免疫学 免疫学 免疫学
- 肌肉生理学 肌肉生理学
- 分子生物学分子生物学
背景情况:
- 异形性炎症性肌肉病变 (IIM) 是一种导致肌肉衰弱的自身免疫性疾病.
- T淋巴细胞透到肌肉中是IIM病变发生的关键因素.
- 核因素红色素2相关因子2 (Nrf2) 调节炎症反应.
研究的目的:
- 研究 Nrf2 肌肉在实验性自身免疫肌炎 (EAM) 中的作用.
- 探索Nrf2对T淋巴细胞透和EAM中化学激素表达的影响.
- 评估Nrf2作为IIM相关肌肉衰弱的治疗标.
主要方法:
- 在C57BL/6小鼠中诱导EAM以模拟自身免疫性肌肉炎.
- 对T淋巴细胞透,细胞因子 (IFN-γ,TNF-α) 和骨肌肉中的化学因子mRNA表达的分析.
- 使用C2C12神经管进行体外研究,以评估对炎症性细胞因子和Nrf2激活的化学因子反应.
- 生成肌肉特定的Nrf2淘汰赛小鼠,以确定Nrf2在EAM中的作用.
主要成果:
- EAM诱导了显著的肌肉质量和功能损失,伴随着CD4+/CD8+T淋巴细胞透率的增加以及IFN-γ,TNF-α和化基因mRNA水平的升高 (CCL3,CCL5,CXCL9,CXCL10,CXCL16).
- IFN-γ和TNF-α治疗可以提高肌管中的化学因表达的调节.
- 在骨肌中,EAM增加了酸化Nrf2,Nrf2的激活增强了CCL5mRNA的表达.
- 肌肉特定的Nrf2淘汰赛减轻了EAM诱导的肌肉虚弱,降低了CCL5表达,CD8+T淋巴细胞透和IFN-γ水平.
结论:
- Nrf2在EAM的发病过程中发挥着关键作用,特别是在调节化学激素表达和T淋巴细胞透方面.
- 准Nrf2活动是一个潜在的治疗策略,可以缓解IIM的肌肉软弱.
- 这些发现突出了Nrf2,炎症和肌肉病理在自身免疫性肌肉病变之间的复杂关系.
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