Characteristics of Donor-Specific Antibodies Associated With Antibody-Mediated Rejection in Lung Transplantation

Although donor specific anti-human leucocyte antigen (HLA) antibodies (DSA) are frequently found in recipients after lung transplantation (LT), the characteristics of DSA which influence antibody-mediated rejection (AMR) in LT are not fully defined. We retrospectively analyzed 206 consecutive LT patients of our center (2010-2013). DSA were detected by using luminex single antigen beads (SAB) assay and mean fluorescence intensity (MFI) was assessed. Within the study population, 105 patients had positive DSA. Patients with and without AMR (AMRPos, n=22 and AMRNeg, n=83 respectively) were compared. AMRPos patients had significantly greater frequencies of anti HLA DQ DSA (DQ DSA) than AMRNeg patients (95% vs 58%, respectively, p<0.0001). Compared to AMRNeg patients, AMRPos patients higher DQ DSA sum MFI (7332[2067-10213] vs 681[0-1887], p<0.0001). DQ DSA when associated with AMR, had more frequent graft loss and Chronic Lung Allograft Dysfunction (CLAD). These data suggest i) that DSA characteristics clearly differ between AMRPos and AMRNeg patients ii) and the deleterious impact of DQ DSA on clinical outcome.