通过非致病性人类抗体对HLA-A*11:01结合的TCR封闭
Maryam Hamidinia1,2, Yue Gu1,2,3, Zheng Ser4
1Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
一些人类白细胞抗原 (HLA) 特定抗体可以通过阻断T细胞反应来保护移植器官,从而挑战所有此类抗体都会导致排斥的观点. 这一发现表明,在移植中对特定的HLA抗体有潜在的治疗应用.
科学领域:
- 免疫学 免疫学 免疫学
- 移植科学 移植科学
- 分子生物学分子生物学
背景情况:
- 器官移植是器官衰竭的重要疗法,但由T细胞和向人类白细胞抗原 (HLA) 的抗体驱动的移植排斥仍然是一个重大挑战.
- 反捐赠者HLA抗体通常被认为是有害的,导致移植被拒绝并取消捐赠者-接受者对的资格.
- 长期移植幸存者的alloantibodies存在表明潜在的保护作用,对它们的整体影响产生模糊性.
研究的目的:
- 为了调查aloantibodies在器官移植中的双重作用,探索有害和潜在的保护作用.
- 产生和描述HLA-A*11:01特异性单克隆抗体,以了解它们对T细胞激活的影响.
- 探索HLA特异性抗体在调节针对全移植的免疫反应中的治疗潜力.
主要方法:
- 从人类非免疫抗体库生成HLA-A*11:01特异性单克隆抗体.
- 对T细胞激活的抗体影响的评估,包括T细胞受体 (TCR) 识别,免疫突触形成和下游信号通路 (NFAT1,ERK酸化).
- 利用交叉连接质谱法来识别抑制性抗体准的特定表位.
主要成果:
- 确定了一种特定于HLA-A*11:01的单克隆抗体,该抗体有效地阻断TCR识别和T细胞激活.
- 这种抗体抑制了NFAT1的转位和ERK的酸化,这对于T细胞效应器功能和信号传导至关重要.
- 鉴定到的表位发现,抗体抑制了TCR与HLA分子的结合,从而阻止了T细胞的反应.
结论:
- 一些特定于HLA的配合抗体可以通过抑制T细胞对配合移植的反应来发挥保护作用.
- 这些发现需要在移植中对捐赠者特异性抗体 (DSAs) 重新评估,因为有些可能表明预后有利.
- 鉴定到的抑制性抗体对移植中针对不匹配的HLA分子的向治疗策略具有治疗前景.
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