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 Blood, 15 November 2004, Vol. 104, No. 10, pp. 3393-3399.
Prepublished online as a Blood First Edition Paper on July 27, 2004; DOI 10.1182/blood-2004-02-0763.

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TRANSPLANTATION

Paradoxical effects of interleukin-18 on the severity of acute graft-versus-host disease mediated by CD4+ and CD8+ T-cell subsets after experimental allogeneic bone marrow transplantation

Chang-Ki Min, Yoshinobu Maeda, Kathleen Lowler, Chen Liu, Shawn Clouthier, David Lofthus, Elizabeth Weisiger, James L. M. Ferrara, and Pavan Reddy

From the Department of Internal Medicine, University of Michigan Cancer Center, Ann Arbor; and the Department of Pathology, University of Florida College of Medicine, Gainesville.

Administration of exogenous interleukin-18 (IL-18) regulates experimental acute graft-versus-host disease (GVHD) in a Fas-dependent manner when donor CD4+ T cells are required for mortality after experimental allogeneic bone marrow transplantation (BMT). However, CD4+ and CD8+ T cells can induce acute GVHD after clinical allogeneic BMT, and the role of IL-18 in CD8+-mediated acute GVHD is unknown. We, therefore, determined the role of IL-18 in GVHD mediated by CD4+ or CD8+ T cells across major histocompatibility complex (MHC) class II- and class I-disparate allogeneic BMT, respectively. Administering IL-18 significantly increased survival in CD4+-mediated GVHD but reduced survival in CD8+-mediated GVHD. This increase in deaths was associated with significantly greater clinical, biochemical, and histopathologic parameters of GVHD damage and was independent of Fas expression on donor T cells. Administering IL-18 significantly enhanced allospecific cytotoxic function and expansion of CD8+ cells. Endogenous IL-18 was critical to GVHD mediated by CD8+ donor T cells because IL-18 receptor-deficient donors caused significantly less GVHD but exacerbated CD4+-mediated, GVHD-related death. Furthermore, administering anti-IL-18 monoclonal antibody significantly reduced CD8+-mediated, GVHD-related death. Together these findings demonstrate that IL-18 has paradoxical effects on CD4+ and CD8+ cell-mediated GVHD. (Blood. 2004;104:3393-3399)


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