Cytomegalovirus (CMV) infection is associated with allograft rejection but the mechanisms behind are poorly defined yet. Although cross-reactivity of T cells to alloantigen and CMV has been hypothesized, direct evidence in patients is lacking. In this observational cohort study, we tested the pre-transplant effector/memory T cell response to CMV peptide pools and alloantigen in 78 living donor/recipient pairs using the interferon-gamma Enzyme-Linked ImmunoSpot (ELISPOT) assay. To prove the hypothesis of cross-reactivity, we analyzed by applying next-generation sequencing the T cell receptor ß (TCR- ß) repertoire of CMV- and alloantigen-reactive T cells enriched from peripheral pre-transplant blood of 11 CMV-seropositive and HLA class I mismatched patients. Moreover, the TCR-repertoire was also analyzed in the allograft biopsies of those patients. There was a significant association between the presence of pre-transplant CMV immediate-early protein 1 (IE-1)-specific effector/memory T cells and acute renal allograft rejection and function (p = 0.01). Most importantly, we revealed shared TCR-ß sequences between CMV-IE1 and donor alloantigen-reactive T cells in all pre-transplant peripheral blood samples analyzed in CMV-seropositive patients who received HLA class I mismatched grafts. Identical TCR sequences were also found in particular in post-transplant allograft biopsies of patients with concomitant CMV infection and rejection. Our data show the presence of functional, cross-reactive T cells and their clonotypes in peripheral blood and in kidney allograft tissue. It is therefore likely that CMV-donor cross-reactivity as well as CMV specific T cell elicited inflammation is involved in the processes that affect allograft outcomes.

BIH Centre for Regenerative Therapies Berlin Centre for Advanced Therapies Charité University Medicine Berlin Berlin Germany

CLIP Childhood Leukaemia Investigation Prague Department of Paediatric Haematology and Oncology 2nd Faculty of Medicine Charles University Prague and University Hospital Motol Prague Czechia

Department of Immunogenetics Institute for Clinical and Experimental Medicine Prague Czechia

Department of Nephrology Transplant Centre Institute for Clinical and Experimental Medicine Prague Czechia

Department of Paediatric Haematology and Oncology 2nd Faculty of Medicine and Motol University Hospital Charles University Prague Czechia

Department of Transplant Pathology Transplant Centre Institute for Clinical and Experimental Medicine Prague Czechia

Department of Transplant Surgery Institute for Clinical and Experimental Medicine Prague Czechia

Transplant Laboratory Institute for Clinical and Experimental Medicine Prague Czechia

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Non-Mutated Nucleophosmin 1 Is Recognized by the CD8+ T Lymphocytes of an AML Patient after the Transplantation of Hematopoietic Stem Cells from an HLA-Haploidentical Donor