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Dichotomous Role of Interferon-gamma in Allogeneic Bone Marrow Transplant

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Date 2009 Oct 14
PMID 19822293
Citations 35
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Abstract

Interferon (IFN)-gamma is a pleiotropic cytokine with a central role in innate and adaptive immunity. As a potent pro-inflammatory and antitumor cytokine, IFN-gamma is conventionally thought to be responsible for driving cellular immune response. On the other hand, accumulating evidence suggests that IFN-gamma also has immunosuppressive activity. An important role for IFN-gamma in inhibiting graft-versus-host disease (GVHD) has been demonstrated in murine models, despite IFN-gamma being one of the key factors amplifying T cell activation during the process of acute GVHD (aGVHD), the major complication and cause of post-transplant mortality in allogeneic bone marrow transplantation (BMT). At the same time, IFN-gamma facilitates graft-versus-leukemia (GVL) activity. Dissociation of GVL effects from GVHD has been the ultimate goal of allogeneic BMT in the treatment of hematologic malignancies. This paradoxic role of IFN-gamma makes modulating its activity a promising strategy to maximize GVL while minimizing GVHD and improve clinical outcomes in BMT. In this review, the effects of IFN-gamma on GVHD and GVL are discussed with consideration of the mechanism of IFN-gamma action.

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