Abstract:

Objective A method for interpretation of donor-specific antibody（DSA）when the donor human leukocyte antigen（HLA）typing information is unavailable but with suspected antibody-mediated rejection（AMR）was demonstrated，which may improve the accuracy of clinical diagnosis and treatment. Methods Fresh transplanted kidney tissues from two patients with suspected AMR were obtained and digested for total DNA extraction. Then HLA typings of the donor and recipient was conducted. The donor HLA typing was obtained by matching the total HLA typing information with the recipient peripheral blood HLA typing. HE staining and C4d immunohistochemistry staining of the paraffin-embedded tissues of the transplanted kidney were performed. DSA-mediated AMR wasdetermined based on the patient's clinical manifestations，pathological findings，recipient's peripheral blood HLAantibody test and HLA typing results of the donor and recipient. Results One case was diagnosed with DSA-mediated C4d-negative AMR and returned to dialysis after graft nephrectomy while the other case was not considered having DSA-mediated AMR. The patient’s condition improved after 3 d of high-dose prednisolone therapy. The patient was currently surviving with a well-functioning transplanted kidney. Conclusion The method of identifying DSA by the donor HLA typing results using the transplanted kidney biopsy tissues provides necessarytechnical support for the follow-up of kidney transplant recipients who seek care at different medical centers with unavailable donor HLA typing information. In patients with suspected AMR，HLA typing of donor and recipient，DSA interpretation，and pathological findings should be combined to make an accurate clinical diagnosis and to guide the precise treatment. 

Key words: Antibody-mediated rejection ；Donor specific antibody , ； , Human leukocyte antigen typing , ；Renal allograft tissue

摘要：

目的 为供者人类白细胞抗原（human leukocyte antigen，HLA）分型信息缺失并可疑抗体介导排斥反应（antibody-mediated rejection，AMR）的临床情景提供供者特异性抗体（donor-specific antibody，DSA）判读的方法，提高临床诊疗的准确性。方法 获取 2 例可疑 AMR 患者的新鲜移植肾组织，一部分经消化、提取总 DNA 后进行供受者 HLA 分型，将总 HLA 分型信息与受者外周血 HLA 分型信息对比，获得 供者 HLA 分型信息。另一部分移植肾组织制作石蜡块，行 HE 染色、C4d 免疫组化等常规病理镜检。结合患者临床表现、病理镜检结果、受者外周血 HLA 抗体检测结果、供受者 HLA 分型信息，判断患者是否为DSA 介导 AMR。结果 第 1 例患者拟诊为 DSA 介导的 C4d（-）AMR，予移植肾切除后恢复透析 ；第 2 例患者不属于 DSA 介导的 AMR，予甲泼尼龙冲击治疗 3 d 后病情好转，目前患者生存情况和移植肾功能良好。结论 在供者 HLA 分型信息缺失情况下，利用移植肾活检组织对供者进行 HLA 分型从而判定 DSA 存在的方法为跨地域、跨医疗中心就医的移植肾受者随诊工作提供必要的技术支持。对于可疑 AMR 患者，应当结合供受者 HLA 分型、DSA 判读与病理镜检结果，以作出准确的临床诊断，指导患者的精准治疗。

关键词:

抗体介导排斥反应 , 供者特异性抗体 , 人类白细胞抗原分型 , 移植肾组织