干扰素-γ在免疫肌肉病变中引起肌原细胞功能障碍和衰老
Cyrielle Hou1, Baptiste Periou1,2,3, Marianne Gervais1
1Paris Est Créteil University, INSERM, IMRB U955-Team Relaix, F-94010 Créteil, France.
Brain : a journal of neurology
|April 29, 2025
概括
干扰素- (IFNγ) 通过损害肌肉干细胞功能和促进衰老,驱动免疫肌肉病变中的肌肉缩. 像鲁克索利提尼布这样的JAK1/2抑制剂在恢复肌肉健康方面表现有希望,并可能为包括体肌炎提供新的治疗方法.
科学领域:
- 免疫学和肌肉生物学
- 炎症性肌肉病的分子机制
背景情况:
- 异常性免疫肌肉病 (IIM) 涉及免疫驱动的肌肉损伤,其特征是肌纤维缩和异常的MHC表达.
- 在抗合成酶综合征 (ASS) 和包容体肌炎 (IBM) 中观察到IFNγ和衰老通路的升级.
研究的目的:
- 调查IFNγ,主要基因相容性复合体 (MHC) 表达和IIM肌肉缩之间的联系.
- 阐明IFNγ诱导的肌肉干细胞 (MuSC) 功能障碍的机制,并探索治疗干预措施.
主要方法:
- 来自IIM患者 (ASS和IBM) 的肌肉活检的转录组分析.
- 在体内小鼠模型中,慢性IFNγ释放和急性肌肉损伤.
- 在体外研究中使用培养的人类MuSC和用JAK1/2抑制剂治疗.
主要成果:
- 在ASS和IBM中,IFNγ表达与肌纤维缩相关;在MuSC中过度表达表明它们对IFNγ的反应.
- 在小鼠中,IFNγ暴露损害了肌肉修复,减少了肌肉重量和肌纤维直径,并促进了纤维化.
- 在体外,IFNγ损害了人类的MuSC增殖和融合,诱导衰老,并抑制了MyoD表达和细胞循环.
- 卢克索利提尼布 (JAK1/2抗剂) 阻断了IFNγ诱导的MHC-II表达,恢复了MuSC增殖,减少衰老,并在体内改善了肌肉参数.
结论:
- IFNγ通过JAK1/2通道调解包容体肌肉炎 (IBM) 中的肌肉缩,损害粘膜细胞功能并促进衰老.
- 抑制JAK1/2代表了IBM的潜在治疗策略,为传统免疫抑制剂提供了替代方案.
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