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Lal , G. and Yumi , N. and Sethi , A. and Singh , A. and Burrell , B. and Kulkarni , N. and Colin , B.C. and Daiki , I. and Zhang , T. and Bromberg, J.S. (2015) Interleukin-10 From Marginal Zone Precursor B-Cell Subset Is Required for Costimulatory Blockade-Induced Transplantation Tolerance. Transplantation , 99 (9). pp. 1817-1828.

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Background: Blocking CD40-CD40L costimulatory signals induces transplantation tolerance. Although B-cell depletion prevents alloantibody formation, nonhumoral functions of B cells in tolerance have not been well characterized. We investigated whether specific subsets of B cell or B cell–derived interleukin (IL)-10 contribute to tolerance. Methods: Wild type C57BL/6, or B cell–specific interleukin (IL)-10−/− (CD19-Cre+/−::IL-10fl/fl) mice, received vascularized BALB/c cardiac allografts. BALB/c donor-specific splenocyte transfusion and anti-CD40L monoclonal antibody were used as tolerogen. B cells were depleted with antimouse CD20 monoclonal antibody. Various B-cell subsets were purified and characterized by flow cytometry, reverse transcription polymerase chain reaction, and adoptive transfer. Results: B-cell depletion prevented costimulatory blockade-induced allogeneic tolerance. Costimulatory blockade increased IL-10 in marginal zone precursor (MZP) B cells, but not other subsets. In particular, costimulatory blockade did not change other previously defined regulatory B-cell subsets (Breg), including CD5+CD1dhi Breg or expression of TIM1 or TIM4 on these Breg or other Breg cell subsets. Costimulatory blockade also induced IL-21R expression in MZP B cells, and IL-21R+ MZP B cells expressed even more IL-10. B-cell depletion or IL-10 deficiency in B cells prevented tolerance in a cardiac allograft model, resulting in rapid acute cardiac allograft rejection. Adoptive transfer of wild type MZP B cells but not other subsets to B cell–specific IL-10 deficient mice prevented graft rejection. Conclusions: CD40 costimulatory blockade induces MZP B cell IL-10 which is necessary for tolerance. These observations have implications for understanding tolerance induction and how B cell depletion may prevent tolerance.

Item Type: Article
Subjects: Infection and Immunity
Depositing User: Mr. Rameshwar Nema
Date Deposited: 04 Dec 2015 10:25
Last Modified: 19 Feb 2016 05:41
URI: http://nccs.sciencecentral.in/id/eprint/215

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