内源性抗原在自身免疫性关节炎模型中塑造了转录组和TCR谱系
Elizabeth E McCarthy1,2,3, Steven Yu1, Noah Perlmutter1
1Rosalind Russell and Ephraim P. Engleman Rheumatology Research Center, Department of Medicine.
The Journal of clinical investigation
|November 26, 2024
概括
在SKG小鼠中缺陷的T细胞信号传递促进了致病性自反应性CD4+T细胞. 内源逆转录病毒破坏耐受性,导致自身免疫性关节炎,但抗逆转录病毒治疗可以制疾病.
科学领域:
- 免疫学 免疫学 免疫学
- 这是一种自身免疫力.
- 分子生物学分子生物学
背景情况:
- 致病性自动反应性CD4+T细胞是关键在诸如关节炎之类的自身免疫性疾病.
- 了解受损的T细胞受体 (TCR) 信号如何促进它们的发展,对于新疗法至关重要.
研究的目的:
- 在SKG小鼠中研究病原性自反应性CD4+T细胞的发展背后的分子机制,这些小鼠的TCR信号受损.
- 确定内源逆转录病毒在驱动自身免疫性关节炎中的作用.
主要方法:
- 大量和单细胞RNA测序 (scRNA-Seq) 和单细胞T细胞受体测序 (scTCR-Seq) 用于分析SKG小鼠的CD4+T细胞.
- 分析的重点是确定关节致病和野生型 (WT) 细胞之间的基因表达和TCR使用的差异.
- 抗逆转录病毒治疗和T细胞枯竭的影响在体内进行了评估.
主要成果:
- 尽管TCR信号受损,SKG CD4+ T细胞显示激活和细胞因子信号基因表达的增加.
- 这些细胞表现出降低了对宽容性标记物的表达,以及对来自小鼠乳腺瘤病毒 (MMTV) 的超抗原 (Sags) 的TCRs的丰富.
- 关节炎关节含有扩展的SAG反应性T细胞和可检测的MMTV前病毒;抗逆转录病毒治疗和SAG反应性T细胞枯竭减少了关节炎.
结论:
- 内源逆转录病毒通过通过SAG反应型TCRs激活自反应性CD4+T细胞来破坏外周耐受性.
- 这种激活导致病原性效应细胞的分化,驱动CD4+ T细胞介导的自身免疫性关节炎.
- 向内源性逆转录病毒或Sag-反应性T细胞为自身免疫性关节炎提供了潜在的治疗策略.
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