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International Journal of Hematology

, Volume 79, Issue 3, pp 209–215 | Cite as

The pathophysiology of chronic graft-versus-host disease

Progress in hematology

Abstract

Chronic graft-versus-host disease (GVHD) still remains the most significant complication after allogeneic hematopoietic stem cell transplantation. The disease usually appears after day 100 and is characterized by signs and symptoms similar to autoimmune diseases.The pathophysiology of chronic GVHD is poorly understood because of the lack of highly satisfactory animal models and basic studies in patients. It has not been clearly determined whether the disease is a distinct entity or a continuation of acute GVHD. In experimental and clinical studies of chronic GVHD, thymic atrophy, lymphocyte depletion, and autoantibody formation have been described. Conditioning regimens and acute GVHD may disrupt thymic function and dysregulate the negative selection process of potentially autoreactive T-lymphocytes. Disruption of thymic apoptosis and failure to eliminate the majority of self-reactive lymphocytes may lead to impairment of lymphocyte homeostasis and self tolerance. Expansion and effector functions of autoreactive T-cells will then promote autoreactive B-cell activation and production of autoantibodies with target-organ damage. Chronic GVHD requires continuous CD4+ T-cell help for B-cells and is known as T-helper 2 (Th2) disease. Murine models have demonstrated the roles of interleukin (IL)-12 and IL-18 in chronic GVHD. IL-12 may cause an increase in donor CD8+ cytotoxic T-cells leading to conversion of chronic GVHD to an acute form. In contrast, IL-18 prevents chronic GVHD by decreasing numbers of CD4+ (Th2) cells and host-reactive B-cell activation and reducing alloantigen-specific immune response. Mouse and human cellular genomics coupled with advances in cell biology in donorrecipient tolerance will improve our understanding of transplantation immunology and may offer new approaches to the challenge of ameliorating chronic GVHD.

Key words

Late effects Chronic graft-versus-host disease Autoimmunity Stem cell transplantation Immune tolerance 

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Copyright information

© The Japanese Society of Hematology 2004

Authors and Affiliations

  1. 1.Hematopoietic Stem Cell Transplantation Unit, Institute of OncologyHacettepe UniversityAnkaraTurkey

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