Costimulation blockade alters germinal center responses and prevents antibody-mediated rejection.
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De novo donor-specific antibody (DSA) after organ transplantation promotes antibody-mediated rejection (AMR) and causes late graft loss. Previously, we demonstrated that depletion using anti-CD3 immunotoxin combined with tacrolimus and alefacept (AMR regimen) reliably induced early DSA production with AMR in a nonhuman primate kidney transplant model. Five animals were assigned as positive AMR controls, four received additional belatacept and four received additional anti-CD40 mAb (2C10R4). Notably, production of early de novo DSA was completely attenuated with additional belatacept or 2C10R4 treatment. In accordance with this, while positive controls experienced a decrease in peripheral IgM(+) B cells, bela- and 2C10R4-added groups maintained a predominant population of IgM(+) B cells, potentially indicating decreased isotype switching. Central memory T cells (CD4(+) CD28(+) CD95(+)) as well as PD-1(hi) CD4(+) T cells were decreased in both bela-added and 2C10R4-added groups. In analyzing germinal center (GC) reactions in situ, lymph nodes further revealed a reduction of B cell clonal expansion, GC-follicular helper T (Tfh) cells, and IL-21 production inside GCs with additional belatacept or 2C10R4 treatment. Here we provide evidence that belatacept and 2C10R4 selectively suppresses the humoral response via regulating Tfh cells and prevents AMR in this nonhuman primate model.
follicular helper T cells
germinal center reaction
Recombinant Fusion Proteins
Published Version (Please cite this version)10.1111/ajt.12526
Publication InfoKim, EJ; Kwun, J; Gibby, AC; Hong, JJ; Farris, AB; Iwakoshi, NN; ... Knechtle, SJ (2014). Costimulation blockade alters germinal center responses and prevents antibody-mediated rejection. Am J Transplant, 14(1). pp. 59-69. 10.1111/ajt.12526. Retrieved from https://hdl.handle.net/10161/10063.
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David C. Sabiston, Jr. Distinguished Professor of Surgery
I am a surgeon with interest in immune management of transplant recipients. I am particularly interested in therapies that influence T cell costimulation pathways and adjuvant therapies that facilitate costimulation blockade to prevent the rejection of transplanted organs without undue suppression of protective immunity. I am also interested in understanding how injury, such as that occurring during trauma or in elective surgery, influences immune responses and subsequent healing following injur
William R. Kenan, Jr. Distinguished Professor
During my career as an academic surgeon, I have had the privilege of leading and/or participating in a diverse portfolio of hypothesis-driven research projects. These projects have centered on the immunology of surgery and transplantation, including both cellular and antibody-mediated immune responses. During my training I studied the response of hyper-sensitized recipients to allogeneic liver transplantation, and am currently studying means of reducing immunologic memory that might
Assistant Professor of Surgery
Research interests include humoral tolerance to organ transplants in animal model and humans, developing a clinically relevant animal model to study the mechanisms of antibody-mediated rejection (AMR), and establishing a conceptual basis that will translate into therapeutic intervention of AMR.
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