脂肪组织在肥胖中含有致病性T细胞,这些T细胞会加剧炎症性关节炎
Heather J Faust1, Margaret H Chang1,2, A Helena Jonsson1,3
1Division of Rheumatology, Inflammation, and Immunity, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA.
The Journal of experimental medicine
|July 7, 2025
概括
肥胖会通过内脏脂肪组织 (VAT) 中的T细胞恶化炎症性关节炎. 在T细胞中的干扰素α信号驱动这种免疫反应,增加肥胖个体关节炎的严重程度.
科学领域:
- 免疫学 免疫学 免疫学
- 代谢性疾病研究研究
- 类风湿病学 类风湿病学
背景情况:
- 肥胖会加剧炎症性关节炎,甚至影响不承载载荷的关节.
- 肥胖与关节炎严重程度相关的潜在免疫机制在很大程度上是未知的.
研究的目的:
- 阐明肥胖会恶化炎症性关节炎的免疫机制.
- 研究T细胞和脂肪组织在与肥胖相关的关节炎中的作用.
主要方法:
- 利用一种具有可追踪 CD8+ OT-I T 细胞的抗原诱导关节炎的小鼠模型.
- 在高脂肪饮食 (HFD) 的肥胖小鼠的内脏脂肪组织 (VAT) 中分析了T细胞群和基因表达.
- 雇佣了增值税移植,CD8 T细胞枯竭和基因操纵 (Ifnar1删除) 来评估因果关系.
主要成果:
- 肥胖小鼠在VAT中显示CD8+T细胞的扩张,这在移植后加剧了关节炎的严重程度.
- 大量RNA测序揭示了VAT T细胞中的亲炎性基因表达,包括增加IFN-α和IFN-γ信号传递.
- 干扰素α (IFNα) 给药扩大了VAT CD8 T细胞,而T细胞中的Ifnar1删除减少了肥胖小鼠的关节炎严重程度.
结论:
- 肥胖症通过IFNα信号传递促进T细胞在内脏脂肪组织中的激活和扩张.
- 这种脂肪组织介导的免疫反应对肥胖个体炎症性关节炎的恶化有显著的贡献.
- 准T细胞中的IFNα信号传递可能为管理肥胖症炎症性关节炎提供治疗策略.
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