Donor non-specific MICA antibodies in renal transplant recipients.
Despite recent advances in solid organ transplantations, an antibody mediated rejection caused by donor specific antibodies is still a major problem in kidney graft survival. Besides HLA-induced humoral response, antibodies against MICA antigens have recently attracted attention because of their possible role in graft rejection. The aim of our study was to establish whether renal recipients produce antibodies against MICA molecules due to the transplantation and if they are specific for MICA antigens of the donors. MICA antibody screening was performed in 124 kidney recipient sera. 22 sera, that were found to be MICA antibody positive, were further examined for MICA antibody profiles and compared with donor MICA alleles. The analysis of MICA antibody positive sera showed mostly more complex reactivity patterns. A significant fraction of patient sera (59%) reacted not only with the donor MICA antigens, but also with other MICA patterns. A match between antibody specificities and MICA antigens was observed in 41% of renal recipients only. On the other hand, as much as in 36% of recipient sera were detected antibodies against their own MICA molecules. We did not prove a complete correlation between the recipient MICA antibody specificities and MICA antigens of the donor. We assume that MICA antibody induction occurs not only due to the allogeneic stimulation itself but also due to other factors that need to be elucidated.
Department of Immunology, Comenius University Faculty of Medicine, Odborárske nám. 14, 813 72 Bratislava, Slovakia. Electronic address: michal.sapak@fmed.uniba.sk.
Michal
M
Sapák
National Transplantation Organisation, Limbová 12, 833 03 Bratislava, Slovakia.
Silvia
S
Chreňová
National Transplantation Organisation, Limbová 12, 833 03 Bratislava, Slovakia.
Jana
J
Tirpáková
Urology Clinic of University Hospital Bratislava, Bratislava, Slovakia.
Zuzana
Z
Žilinská
Department of Immunology, Comenius University Faculty of Medicine, Odborárske nám. 14, 813 72 Bratislava, Slovakia.
Vladimíra
V
Ďurmanová
Department of Immunology, Comenius University Faculty of Medicine, Odborárske nám. 14, 813 72 Bratislava, Slovakia.
Ivana
I
Shawkatová
Department of Medical Chemistry, Biochemistry and Medical Biochemistry, Faculty of Medicine, Comenius University, Sasinkova 2, Bratislava, Slovakia.
Vladimír
V
Jakuš
National Transplantation Organisation, Limbová 12, 833 03 Bratislava, Slovakia.
Daniel
D
Kuba
Department of Immunology, Comenius University Faculty of Medicine, Odborárske nám. 14, 813 72 Bratislava, Slovakia.
Milan
M
Buc
D000328:Adult; D000917:Antibody Formation; D000920:Antibody-Dependent Cell Cytotoxicity; D001324:Autoantigens / Q000097:blood / Q000276:immunology*; D005260:Female; D006084:Graft Rejection / Q000175:diagnosis / Q000276:immunology*; D006680:HLA Antigens / Q000276:immunology; D015395:Histocompatibility Antigens Class I / Q000276:immunology*; D006801:Humans; D007518:Isoantibodies / Q000097:blood / Q000276:immunology*; D016030:Kidney Transplantation; D008297:Male; D008875:Middle Aged; D012698:Serologic Tests; D055815:Young Adult
D001324:Autoantigens; D006680:HLA Antigens; D015395:Histocompatibility Antigens Class I; D007518:Isoantibodies; C099187:MHC class I-related chain A
AMR; Antibodies against MICA; HLA; Kidney transplantation; MICA; MICA alleles; MICA antibody specificities; NK; antibody mediated rejection; human leukocyte antigen; major histocompatibility complex class I chain-related gene A; natural killer