主体组织相容性复合体II类表达骨髓巨核细胞激活CD4T细胞并诱导调节性T细胞命运
Virginia Camacho1,2, Karen G Wang1, Pavel Hanč3
1Vascular Biology Program, Boston Children's Hospital, Boston, MA, USA.
bioRxiv : the preprint server for biology
|December 15, 2025
概括
骨髓巨核细胞 (MKs) 作为抗原呈现细胞,表达MHC II以激活T细胞. 这种相互作用会影响免疫反应,并维持造血干细胞.
科学领域:
- 免疫学 免疫学 免疫学
- 血液学 血液学 血液学
- 细胞生物学 细胞生物学
背景情况:
- 专业的抗原呈现细胞通常驱动适应性免疫.
- 巨核细胞 (MKs) 众所周知是血小板的生产,但表现出功能异质.
- 骨髓中的非典型细胞可以呈现抗原.
研究的目的:
- 研究骨髓巨核细胞 (MKs) 的免疫潜力.
- 为了确定MKs是否可以作为抗原呈现细胞发挥作用.
- 阐明MKs在适应性免疫和造血位维护中的作用.
主要方法:
- 流细胞计检测MHC II,CD80,CD86和CD40在骨髓MKs上的表达.
- 抗原呈现测试用于评估MKs的T细胞激活.
- 免疫类药物用于识别由MK MHC II呈现的.
- 产生和分析MK特异性的MHC II淘汰赛小鼠 (Pf4-MHCΔ/Δ).
主要成果:
- 大约20%的骨髓MKs表达MHC II和共刺激分子 (CD80,CD86,CD40).
- MKs处理和呈现抗原,以MHC II依赖的方式激活T细胞.
- MK-T细胞相互作用诱导TGF-β1分泌并促进调节性T细胞分化.
- 特定于MK的MHC II删除改变了TLR信号,减少了骨髓TGF-β1,并减少了造血干细胞数量.
结论:
- 骨髓MKs作为非正规的抗原呈现细胞起作用.
- MHC II+ MKs调节适应性免疫和T细胞反应.
- MKs通过TGF-β1生产来维持造血干细胞利基的作用.
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