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자료유형
학술저널
저자정보
원동일 (경북대학교) Nan Young Lee (Kyungpook National University) Jeong-Hoon Lim (Kyungpook National University Hospital) 한영석 (경북대학교) Chan-Duck Kim (Kyungpook National University) Seung Huh (Kyungpook National University)
저널정보
대한혈액학회 Blood Research Blood Research Vol.55 No.2
발행연도
2020.1
수록면
91 - 98 (8page)

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BackgroundHuman leukocyte antigen (HLA) molecules are cell-bound but can be identified in a solu-ble form. These soluble HLA (sHLA) molecules have an immunomodulatory function. We investigated whether natural sHLA in donor serum can neutralize donor-specific HLA alloantibodies (DSAs) in recipient serum.MethodsNeutralizing effects of donor serum on DSAs in recipient serum were measured using inhibition assay principle of flow cytometric crossmatch (FCXM), performed using sera from 143 kidney transplant recipients and their donors. The adding of donor serum to recipient serum yielded lower mean fluorescence intensity (MFI) ratios (test/control) than when diluent was added [Roswell Park Memorial Institute (RPMI) or third-party serum], which was presumed to be caused by the neutralizing effects of sHLA.ResultsIn the recipient group with class I DSAs alone (N=14), donor serum addition to recipient serum resulted in lower T cell MFI ratios [2.25 (1.31‒32.51)] than those observed on RPMI addition [3.04 (1.33‒125.39), P<0.05]. In the recipient group with class II DSAs alone (N=27), donor serum addition showed no significant difference in B cell MFI ratios [5.03 (1.41‒103.53)] compared to diluent addition: RPMI [4.50 (1.34‒145.98)] or third-party serum [5.08 (1.44‒138.47)], P>0.05 for both.ConclusionUsing inhibition FCXM, we verified that natural sHLA class I in donor serum neutralizes DSAs in recipient serum. However, no neutralizing effects of sHLA class II were revealed in this study. These potentially beneficial effects of sHLA infused via blood-derived prod-ucts should be considered when desensitizing highly HLA-sensitized patients.

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