ISSN : 2146-3123
E-ISSN : 2146-3131

Long-Term Effects of Antibodies Against Human Leukocyte Antigens Detected by Flow Cytometry in the First Year After Renal Transplantation
Tülay Kılıçaslan Ayna 1, Hayriye Şentürk Çiftçi 1, Mehmet Gürtekin 1, Yaşar Çalışkan 2, Aydın Türkmen 3
1Department of Medical Biology, Faculty of Medicine, İstanbul University, İstanbul, Turkey
2İstanbul Üniversitesi İstanbul Tıp Fakültesi İç Hastalıkları Anabilim Dalı, İstanbul
3Department of Internal Medicine, Division of Nephrology, Faculty of Medicine, İstanbul University, İstanbul, Turkey
DOI : 10.5152/balkanmedj.2012.071
Pages : 37-45

Abstract

Objective: In this study, we aimed to investigate the incidence, dynamics and profiles of human leukocyte antigen (HLA)-directed antibodies developed after transplantation and their impact on graft rejection and outcome in kidney recipients.

Study Design: Prospective follow-up study.

Material and Methods: A total of 56 kidney recipients were monitored at 1st, 6th and 12th months for the development of anti-HLA antibodies using bead based flow-cytometry assays (Flow PRA tests).

Results: In 21 (37.5%) patients, panel reactive antibodies (PRA) was positive after transplantation, however, in 35 (62.5%) patients PRA was found negative. Twelve (57.1%) patients with post-transplantation HLA-reactive antibodies [PRA (+)] and 8 (22.9%) patients with no detectable alloantibodies [PRA (-)] were developed allograft rejection (p=0.010). In the PRA positive patient group the rates of early period infection and delayed graft function (DGF) were higher than the PRA negative patient group. Serum creatinine levels of PRA positive group at 6. and 12. months after transplantation were significantly higher than the PRA negative group (p=0.015 and p=0.048, respectively). The rejection rates of patients who had class I and II HLA antibodies were significantly higher than the patients who had either class I or II HLA antibodies (p=0.011). Acute rejection rates were significantly higher in patients who had class I and II HLA antibodies at the first month (p=0.007).

Conclusion: Higher occurrence of rejection episodes in PRA positive group may show the importance of anti-HLA antibody monitoring using Flow-PRA after renal transplantation as a prognostic marker in terms of graft survival.

Keywords : Anti-HLA antibodies, flow cytometry, renal transplantation

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