增强的TLR7信号质 BCR激活的B细胞在慢性移植对宿主疾病的效应器功能
Sonali J Bracken1, Amy N Suthers2, Rachel A DiCioccio2
1Division of Rheumatology and Immunology, Department of Medicine, Duke University Medical Center, Durham, NC.
Blood advances
|December 19, 2023
概括
慢性移植对宿主疾病 (cGVHD) 涉及具有增强的托尔类受体7 (TLR7) 信号的B细胞,有助于自身免疫反应. 在B细胞中异常的TLR7激活促进了cGVHD中的效应器功能.
科学领域:
- 免疫学 免疫学 免疫学
- 移植生物学 移植生物学
- 这是一种自身免疫力.
背景情况:
- 慢性移植与宿主疾病 (cGVHD) 是全源造血干细胞移植的严重并发症.
- 激活的B细胞在cGVHD中所见的全活性和自身活性中起着关键作用.
- 来自组织损伤的细胞外核酸可以触发B细胞激活.
研究的目的:
- 研究RNA和DNA传感器,特别是Toll样受体7 (TLR7) 和TLR9在cGVHD中B细胞激活中的作用.
- 为了确定cGVHD患者的B细胞是否通过TLR7和TLR9.9表现出异常信号.
主要方法:
- 在cGVHD患者和健康对照的B细胞中比较TLR7表达.
- 在TLR7刺激时评估cGVHDB细胞的插白素-6 (IL-6) 生产.
- 利用蛋白质微阵列来识别含有RNA的自身抗原,这些抗原是cGVHD免疫球蛋白G (IgG) 的目标.
主要成果:
- 与对照组相比,来自cGVHD患者的B细胞显示TLR7表达显著更高.
- 刺激TLR7导致cGVHD B细胞增加IL-6的产生,而低剂量B细胞受体 (BCR) 刺激进一步增强了这种效果.
- 干扰素调节因子5 (IRF5) 的表达和激活在cGVHD B细胞中升高,与TLR7高反应性相关.
- 确定了核酸结合蛋白,包括自抗原Ro-52,作为cGVHD IgG的标,RNA对于IgG与Ro-52结合至关重要.
结论:
- 在cGVHD中的B细胞表现出异常的TLR7信号通路.
- 这种可能由核酸触发的超响应性促进了cGVHD.cGVHD中的致病性B细胞效应器功能.
- 准TLR7信号可能为cGVHD提供治疗策略.
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