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HLA-DQ 在肾移植中的意义:是否需要重新评估人类白细胞抗原配型优先级以改善移植结局?专家综述和建议。

Significance of HLA-DQ in kidney transplantation: time to reevaluate human leukocyte antigen-matching priorities to improve transplant outcomes? An expert review and recommendations.

机构信息

Department of Surgery, Comprehensive Transplant Center, Northwestern University, Chicago, Illinois, USA.

Department of Surgery, University of Cambridge, Cambridge, UK; National Institute of Health Research (NIHR) Blood and Transplant Research Unit in Organ Donation and Transplantation and NIHR Cambridge Biomedical Research Centre, University of Cambridge, Cambridge, UK.

出版信息

Kidney Int. 2021 Nov;100(5):1012-1022. doi: 10.1016/j.kint.2021.06.026. Epub 2021 Jul 8.

Abstract

The weight of human leukocyte antigen (HLA) matching in kidney allocation algorithms, especially in the United States, has been devalued in a stepwise manner, supported by the introduction of modern immunosuppression. The intent was further to reduce the observed ethnic/racial disparity, as data emerged associating HLA matching with decreased access to transplantation for African American patients. In recent years, it has been increasingly recognized that a leading cause of graft loss is chronic antibody-mediated rejection, attributed to the development of de novo antibodies against mismatched donor HLA expressed on the graft. These antibodies are most frequently against donor HLA-DQ molecules. Beyond their impact on graft survival, generation of de novo donor-specific HLA antibodies also leads to increased sensitization, as measured by panel-reactive antibody metrics. Consequently, access to transplantation for patients returning to the waitlist in need of a second transplant is compromised. Herein, we address the implications of reduced HLA matching policies in kidney allocation. We highlight the observed diminished outcome data, the significant financial burden, the long-term health consequences, and, more important, the unintended consequences. We further provide recommendations to examine the impact of donor-recipient HLA class II and specifically HLA-DQαβ mismatching, focusing on collection of appropriate data, application of creative simulation approaches, and reconsideration of best practices to reduce inequalities while optimizing patient outcomes.

摘要

人类白细胞抗原 (HLA) 配型在肾脏分配算法中的权重,特别是在美国,已逐步降低,这得到了现代免疫抑制的支持。其目的是进一步减少观察到的族裔/种族差异,因为有数据表明 HLA 配型与非裔美国患者获得移植的机会减少有关。近年来,人们越来越认识到移植物丢失的一个主要原因是慢性抗体介导的排斥反应,这归因于针对移植上表达的不合型供体 HLA 产生的新抗体。这些抗体最常针对供体 HLA-DQ 分子。除了对移植物存活的影响外,新产生的供体特异性 HLA 抗体也会导致致敏增加,这可以通过面板反应性抗体指标来衡量。因此,需要进行第二次移植的患者返回候补名单接受移植的机会受到了影响。在此,我们探讨了肾脏分配中 HLA 配型降低政策的影响。我们强调了观察到的结果数据下降、巨大的经济负担、长期的健康后果,以及更重要的是意料之外的后果。我们进一步提出建议,以检查供体-受者 HLA Ⅱ类,特别是 HLA-DQαβ 错配的影响,重点是收集适当的数据、应用创造性的模拟方法,以及重新考虑最佳实践,以减少不平等,同时优化患者结局。

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