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Transplantation:
doi: 10.1097/01.TP.0000438211.34842.5e
Clinical and Translational Research

Peripheral B-Cell Phenotype and BAFF Levels are Associated With HLA Immunization in Patients Awaiting Kidney Transplantation

Snanoudj, Renaud1,2,3; Candon, Sophie1,2,6; Roelen, Dave L.4; Jais, Jean-Philippe2,5; Claas, Frans H.4; Legendre, Christophe3; Chatenoud, Lucienne1,2,6

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Abstract

Background

The role of B-cell subsets in human leukocyte antigen (HLA)-specific humoral responses in patients with end-stage renal disease is poorly documented. The objective of this study was to analyze the potential association between B-cell subsets distribution and anti-HLA antibodies before kidney transplantation.

Methods

The authors studied by flow cytometry peripheral B-cell subsets and serum levels of BAFF, the main homeostatic cytokine for peripheral B cells, in 101 consecutive end-stage renal disease patients admitted for transplantation.

Results

In patients with HLA antibodies detected with Luminex single antigen, the proportion of activated naive B cells (Bm2) was significantly higher (64.4±15.1% vs. 52.5±19.1% in HLA antibody-negative patients, P=0.0008) at the expense of memory B cells, as were BAFF serum levels (1,651±1,297 vs. 1,139±693 pg/mL, P<0.0001). Proportion of Bm2 and BAFF levels were positively associated with the diversity of anti-HLA antibodies. In multivariate analysis, besides HLA-immunizing events (pregnancy and previous transplantation), proportion of Bm2 cells but not of other B-cell subsets or BAFF levels was independently associated with the presence and diversity of anti-HLA antibodies. High proportion of Bm2 cells before transplantation was associated with an increased risk of developing de novo donor-specific antibodies during the first year posttransplant. The authors did not find any association between the frequency of antibody-mediated rejection and pretransplant proportion of any B-cell subset or BAFF serum levels.

Conclusion

Increased proportions of activated naive B cells are linked with pretransplant HLA immunization and the development of posttransplant donor-specific antibodies.

Copyright © 2013 by Lippincott Williams & Wilkins

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