专业抗原呈现Tbet+CD11c+B细胞与未经治疗的风湿性关节炎中骨破坏的相关性
Sarah McGrath1, Kristoffer Grimstad2, Katrin Thorarinsdottir1
1Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
Arthritis & rheumatology (Hoboken, N.J.)
|April 4, 2024
概括
某些表达Tbet和CD11c的记忆B细胞 (MBC) 与风湿性关节炎 (RA) 中的骨损伤有关. 这些细胞通过呈现抗原和激活T细胞来促进RA的发病,从而导致Th17极化和骨质损失.
科学领域:
- 免疫学 免疫学 免疫学
- 类风湿病学 类风湿病学
- 细胞生物学 细胞生物学
背景情况:
- CD21-/低记忆B细胞 (MBCs),包括Tbet+CD11c+细胞,在诸如类风湿关节炎 (RA) 等慢性炎症性疾病中被扩大.
- 在RA中,CD21-/低MBC与关节破坏相关,但Tbet+CD11c+子集的具体作用尚不清楚.
研究的目的:
- 调查CD21-/低Tbet+CD11c+MBC和未经治疗的RA (uRA) 患者的关节破坏之间的联系.
- 阐明这些特定的MBCs在RA病变发生过程中的功能性质.
主要方法:
- 流细胞测量和单细胞RNA测序 (scRNA-seq) 周围血液MBCs的URA患者 (n=36).
- 比较Tbet+CD11c+MBC转录组与突B细胞.
- 在体外共培试验测试以评估Tbet+CD11c+ B细胞-T细胞相互作用.
主要成果:
- CD21-/lowTbet+CD11c+ 周围血液中的MBC与RA患者的骨损伤相关.
- 这些MBCs表现出克隆扩张并表达出体质突变的V基因,具有与抗原呈现和T细胞共刺激相关的独特基因特征.
- 在体外,Tbet+CD11c+ B细胞在CD4+ T细胞中诱导了Th17细胞极化.
结论:
- Tbet+CD11c+ MBCs通过促进骨的破坏,有助于RA的发病.
- 它们的机制涉及抗原呈现,T细胞激活和随后的Th17极化,这对骨质细胞生成至关重要.
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