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ARD:HLA-DR天然呈递肽的分离鉴定出了类风湿性关节炎的T细胞表位

2022-08-05 彼岸河边草 MedSci原创

该研究在生理相关背景下显著扩展了HLA-DR分子呈现的肽库,鉴定了RA患者的 CD4 + T细胞识别的六个新表位。这些信息对于更好地了解疾病免疫病理学以及设计耐受抗原特异性免疫疗法非常重要。

目的:类风湿性关节炎(RA)的免疫发病机制围绕着抗原提呈细胞表面上的人白细胞抗原 (HLA)-II类分子向自身反应性CD4 + T细胞呈递特征不明的自身肽。在这篇研究中,研究人员分析了滑膜组织(ST)和用滑液(SF)或滑膜组织刺激的树突细胞(DC)HLA-DR 相关肽组,以确定 RA 的潜在 T 细胞表位。

方法HLA-DR/肽复合物从RA滑膜组织样品(n=3)和由携带RA相关共享表位阳性HLA-DR分子的健康供体提供、并用RA滑液(n=7)滑膜组织(n=2)刺激产生的单核细胞衍生的DCs中分离出来。通过高分辨率质谱法进行肽测序。通过流式细胞术对来自RA患者(n=29)和健康受试者(n=12)的外周血单个核细胞评估所选肽的免疫刺激能力。

结果研究人员在每个样品中鉴定了103888HLA-DR天然呈递的肽。选择了37种天然和6种瓜氨酸(cit)-肽进行刺激测定。与健康受试者相比,其中六种肽(四个天然肽和两个瓜氨酸肽)增加了RA患者 CD4 + T细胞上CD40L的表达,并特异性地触发了RA CD4 + T细胞上的IFN-γ表达。最后,对髓过氧化物酶衍生肽特异地产生IFN-γ的CD4 + T细胞的百分比与疾病活动呈正相关。

结论该研究在生理相关背景下显著扩展了HLA-DR分子呈现的肽库,鉴定了RA患者的 CD4 + T细胞识别的六个新表位。这些信息对于更好地了解疾病免疫病理学以及设计耐受抗原特异性免疫疗法非常重要。

出处:Maggi J, Carrascal M, Soto L, et al. Isolation of HLA-DR-naturally presented peptides identifies T-cell epitopes for rheumatoid arthritis.Annals of the Rheumatic Diseases 2022;81:1096-1105.

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    2022-08-06 lmm397
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    2022-08-06 marongnuan

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