Determination of the clinical relevance of donor epitope-specific HLA-antibodies in kidney transplantation. 2024

Tineke Kardol-Hoefnagel, and Danial Mohammadi Senejohnny, and Elena G Kamburova, and Bram W Wisse, and Leon Reteig, and Maartje L Gruijters, and Irma Joosten, and Wil A Allebes, and Arnold van der Meer, and Luuk B Hilbrands, and Marije C Baas, and Eric Spierings, and Cornelis E Hack, and Franka E van Reekum, and Arjan D van Zuilen, and Marianne C Verhaar, and Michiel L Bots, and Adriaan C A D Drop, and Loes Plaisier, and Rowena C A Melchers, and Marc A J Seelen, and Jan Stephan Sanders, and Bouke G Hepkema, and Annechien J A Lambeck, and Laura B Bungener, and Caroline Roozendaal, and Marcel G J Tilanus, and Christina E Voorter, and Lotte Wieten, and Elly M van Duijnhoven, and Mariëlle A C J Gelens, and Maarten H L Christiaans, and Frans J van Ittersum, and Shaikh A Nurmohamed, and Neubury M Lardy, and Wendy Swelsen, and Karlijn A M I van der Pant, and Neelke C van der Weerd, and Ineke J M Ten Berge, and Andries Hoitsma, and Paul J M van der Boog, and Johan W de Fijter, and Michiel G H Betjes, and Dave L Roelen, and Frans H Claas, and Frederike J Bemelman, and Aleksandar Senev, and Maarten Naesens, and Sebastiaan Heidt, and Henny G Otten
Center for Translational Immunology, University Medical Center Utrecht, Utrecht, The Netherlands.

In kidney transplantation, survival rates are still partly impaired due to the deleterious effects of donor specific HLA antibodies (DSA). However, not all luminex-defined DSA appear to be clinically relevant. Further analysis of DSA recognizing polymorphic amino acid configurations, called eplets or functional epitopes, might improve the discrimination between clinically relevant vs. irrelevant HLA antibodies. To evaluate which donor epitope-specific HLA antibodies (DESAs) are clinically important in kidney graft survival, relevant and irrelevant DESAs were discerned in a Dutch cohort of 4690 patients using Kaplan-Meier analysis and tested in a cox proportional hazard (CPH) model including nonimmunological variables. Pre-transplant DESAs were detected in 439 patients (9.4%). The presence of certain clinically relevant DESAs was significantly associated with increased risk on graft loss in deceased donor transplantations (p < 0.0001). The antibodies recognized six epitopes of HLA Class I, 3 of HLA-DR, and 1 of HLA-DQ, and most antibodies were directed to HLA-B (47%). Fifty-three patients (69.7%) had DESA against one donor epitope (range 1-5). Long-term graft survival rate in patients with clinically relevant DESA was 32%, rendering DESA a superior parameter to classical DSA (60%). In the CPH model, the hazard ratio (95% CI) of clinically relevant DESAs was 2.45 (1.84-3.25) in deceased donation, and 2.22 (1.25-3.95) in living donation. In conclusion, the developed model shows the deleterious effect of clinically relevant DESAs on graft outcome which outperformed traditional DSA-based risk analysis on antigen level.

UI MeSH Term Description Entries
D007518 Isoantibodies Antibodies from an individual that react with ISOANTIGENS of another individual of the same species. Alloantibodies
D006084 Graft Rejection An immune response with both cellular and humoral components, directed against an allogeneic transplant, whose tissue antigens are not compatible with those of the recipient. Transplant Rejection,Rejection, Transplant,Transplantation Rejection,Graft Rejections,Rejection, Graft,Rejection, Transplantation,Rejections, Graft,Rejections, Transplant,Rejections, Transplantation,Transplant Rejections,Transplantation Rejections
D006680 HLA Antigens Antigens determined by leukocyte loci found on chromosome 6, the major histocompatibility loci in humans. They are polypeptides or glycoproteins found on most nucleated cells and platelets, determine tissue types for transplantation, and are associated with certain diseases. Human Leukocyte Antigen,Human Leukocyte Antigens,Leukocyte Antigens,HL-A Antigens,Antigen, Human Leukocyte,Antigens, HL-A,Antigens, HLA,Antigens, Human Leukocyte,Antigens, Leukocyte,HL A Antigens,Leukocyte Antigen, Human,Leukocyte Antigens, Human
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000092522 Clinical Relevance Criteria to determine whether a finding (e.g., clinical examination, lab test, imaging results) requires a medical intervention for meaningful improvement in outcome often to avoid OVERDIAGNOSIS and/or OVERTREATMENT. Clinical Importance,Clinical Significance,Importance, Clinical,Relevance, Clinical,Significance, Clinical
D000483 Alleles Variant forms of the same gene, occupying the same locus on homologous CHROMOSOMES, and governing the variants in production of the same gene product. Allelomorphs,Allele,Allelomorph
D000939 Epitopes Sites on an antigen that interact with specific antibodies. Antigenic Determinant,Antigenic Determinants,Antigenic Specificity,Epitope,Determinant, Antigenic,Determinants, Antigenic,Specificity, Antigenic
D014019 Tissue Donors Individuals supplying living tissue, organs, cells, blood or blood components for transfer or transplantation to histocompatible recipients. Organ Donors,Donors,Ovum Donors,Semen Donors,Transplant Donors,Donor,Donor, Organ,Donor, Ovum,Donor, Semen,Donor, Tissue,Donor, Transplant,Donors, Organ,Donors, Ovum,Donors, Semen,Donors, Tissue,Donors, Transplant,Organ Donor,Ovum Donor,Semen Donor,Tissue Donor,Transplant Donor
D016030 Kidney Transplantation The transference of a kidney from one human or animal to another. Grafting, Kidney,Renal Transplantation,Transplantation, Kidney,Transplantation, Renal,Kidney Grafting,Kidney Transplantations,Renal Transplantations,Transplantations, Kidney,Transplantations, Renal

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