在树突细胞中与HLA-DR结合的加勒-9控制着免疫突触的形成和T细胞的增殖
Andrea Rodgers-Furones1, Thijs Brands1, Guusje van Gameren1
1Department of Medical BioSciences, Radboudumc, Nijmegen 6525GA, Netherlands.
概括
树突细胞 (DCs) 中的细胞内甲蛋白-9 (gal9) 通过在免疫突触中组织HLA-DR,对CD4+ T细胞激活至关重要. 缺乏gal9的DC显示T细胞反应受损,瘤生长增加.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 分子机制的分子机制
背景情况:
- 树突细胞 (DCs) 通过免疫突触 (IS) 启动T细胞免疫.
- 在直流膜上IS组件的组织是很难理解的.
- 在DC介导的T细胞激活中,加列素的作用需要进一步阐明.
研究的目的:
- 为了研究细胞内加勒-9 (gal9) 在DC介导的T细胞激活中的作用.
- 阐明gal9在DC免疫突触中的功能分子机制.
- 为了确定gal9在T细胞依赖免疫中的体内相关性.
主要方法:
- 共同免疫沉,质谱和NMR分析以研究gal9-HLA-DR相互作用.
- 活细胞成像评估IS形成和动态在gal9贫乏的DCs.
- 在DC和随后的体内瘤生长试验中,有条件的gal9淘汰.
主要成果:
- 细胞内加勒-9 (gal9) 与DC中的HLA-DRα和β细胞质域相互作用.
- 缺乏Gal9的DCs表现出不稳定的IS形成,T细胞活化减少和增殖受损.
- 缺乏gal9减少HLA-DR横向移动性和招募到IS.
- 在DCs中的有条件gal9淘汰会在体内增强瘤生长.
结论:
- 细胞内加勒-9 (gal9) 对于在DC免疫突触中组织HLA-DR至关重要.
- Gal9协调免疫受体的定位,以增强CD4+T细胞的激活.
- 9在T细胞介导的抗瘤免疫力中发挥着关键作用.
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