ARD:白塞病风险变异HLA-B51/ERAP1-Hap10改变人类CD8 T细胞免疫

2022-08-31 彼岸河边草 MedSci原创

该研究结果表明,ERAP1-Hap10变异通过产生HLA-B51限制性肽参与白塞病(BD)发病机制,导致随后的CD8 T细胞反应的免疫优势发生变化。

目的内质网氨肽酶(ERAP1)单倍型Hap10编码具有低酶活性的内质网(ER)驻留肽修整氨肽酶ERAP1的同种异型变异。这种单倍型隐性地赋予了在HLA-B*51携带者白塞病(BD)患者的最高风险。这种上位关系的机制含义和生物学后果尚不清楚。这个研究旨在确定其生物学相关性和功能影响。

方法研究人员对26名未经治疗的土耳其BD受试者和22名健康供体进行基因分型和免疫表型分析,从HLA-B*51+ LCL生成CRISPR-Cas9 ERAP1 敲除细胞(KO),分析HLA I类结合肽组的肽长度差异并评估基因组编辑的细胞在CD8 T细胞共培养系统中的免疫原性。

结果ERAP1-Hap10 的等位基因频率与以前的研究相似。在HLA-B*51背景中,ERAP1-Hap10的携带者和非携带者经抗原激活的CD8 T细胞和幼稚CD8 T细胞群的比例存在变化与野生型对照细胞相比,ERAP1 KO细胞显示出具有更长肽段的肽组,肽段长度超过9聚体,并且它们刺激同种异体反应性CD8 T细胞的能力存在显著差异。

结论该研究证明了低活性ERAP1改变了对CD8 T细胞的免疫原性,由带有欠修剪肽的HLA I类肽组介导受影响携带者中的幼稚/效应CD8 T细胞转变提供了ERAP1-Hap10/HLA-B*51在细胞水平上的生物学证据,并指向HLA-B51受限的过程。该研究结果表明,ERAP1-Hap10变异通过产生HLA-B51限制性肽参与BD发病机制,导致随后的CD8 T细胞的免疫反应发生变化。

出处:Cavers A, Kugler MC, Ozguler Y, Al-Obeidi AF, Hatemi G, Ueberheide BM, Ucar D, Manches O, Nowatzky J. Behçet's disease risk-variant HLA-B51/ERAP1-Hap10 alters human CD8 T cell immunity. Ann Rheum Dis. 2022 Aug 3:annrheumdis-2022-222277. doi: 10.1136/ard-2022-222277. Epub ahead of print. PMID: 35922122.

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    2022-08-30 marongnuan
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