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15 November 2013 : Original article  

Humoral immunity after kidney transplantation: Impact of two randomized immunosuppressive protocols

Tristan LegrisABCDEF, Christophe PicardBDEF, Valérie MoalABE, Stéphane BurteyDE, Anderson LoundouC, Raj PurgusBDE, Bertrand DussolADE, Yvon BerlandADE, Henri Vacher-CoponatABCDEFG

DOI: 10.12659/AOT.889536

Ann Transplant 2013; 18:622-634

Abstract

BACKGROUND: Controlling alloimmune humoral response is a challenge in transplantation. Few studies have evaluated the impact of maintenance immunosuppression on blood humoral parameters.

MATERIAL AND METHODS: We performed a post-hoc analysis on 307 kidney transplant recipients included in a prospective randomized trial comparing tacrolimus/mycophenolate mofetil (Tac/MMF) vs. cyclosporine/azathioprine (CsA/AZA), both used with antithymocyte globulin induction and steroids. Humoral parameters were analyzed at D0, D15, and M12.

RESULTS: IgG, IgA, and IgM levels decreased significantly as soon as D15 in both groups (–35%, –26%, and –35% respectively, vs. D0). At M12, although peripheral B-cell counts did not differ between the groups, Tac/MMF regimen was associated with lower IgG, IgA, and IgM levels than CsA/AZA (–5.9%, –14.6%, and –34%, respectively). Hypogammaglobulinemia at D15 was not associated with an increased risk of infections during the first year. The proportion of HLA-sensitized patients decreased in the Tac/MMF group (15.9% at D0 and 6.7% at M12, p=0.02) and remained stable in the CsA/AZA group (10.3% at D0 and 8.9% at M12, p=0.5). More patients sensitized at baseline became non-sensitized at M12 with Tac/MMF than with CsA/AZA.

CONCLUSIONS: Our results suggest humoral immunosuppression is better with Tac/MMF than with CsA/AZA during the first year of kidney transplantation.

Keywords: Tacrolimus, Mycophenolate Mofetil, HLA antibodies, azathioprine, Cyclosporine A, Immunoglobulins

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Annals of Transplantation eISSN: 2329-0358
Annals of Transplantation eISSN: 2329-0358