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Blood, 1 April 2006, Vol. 107, No. 7, pp. 2993-3001.
Prepublished online as a Blood First Edition Paper on December 13, 2005; DOI 10.1182/blood-2005-09-3623.
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TRANSPLANTATION
Donor CD4+ T and B cells in transplants induce chronic graft-versus-host disease with autoimmune manifestations
Chunyan Zhang,
Ivan Todorov,
Zhifang Zhang,
Yinping Liu,
Fouad Kandeel,
Stephen Forman,
Samuel Strober, and
Defu Zeng
From the Beckman Research Institute, City of Hope National Medical Center, Duarte, CA; and Stanford University School of Medicine, Stanford, CA.
Chronic graft-vs-host disease (GVHD) is a major cause of morbidity and mortality of long-term survivors of allogeneic hemato-poietic cell transplantation (HCT). Chronic GVHD can have features of an autoimmune collagen vascular disease with clinical manifestations similar to autoimmune scleroderma and systemic lupus erythematosus (SLE). However, the pathogenesis of chronic GVHD is poorly understood. It is unclear how autoreactive T and B cells are generated in chronic GVHD recipients. We have recently developed a new chronic GVHD model by transplantation of donor DBA/2 (H-2d) spleen cells into major histocompatibility complex (MHC)-matched but minor antigen-mismatched sublethally irradiated BALB/c (H-2d) recipients as well as athymic BALB/cnu/nu and adult-thymectomized BALB/c recipients. Both euthymic and athymic BALB/c recipients developed high levels of serum IgG autoantibodies, sclerodermatous skin damage, and glomerulonephritis. Disease induction required both donor CD25-CD4+ T and B cells in transplants. In contrast, donor CD25+CD4+ T regulatory (Treg) cells prevented the disease induction. These results indicate that host thymus is not required for induction of chronic GVHD and that quiescent autoreactive T and B cells in transplants from nonautoimmune donors may be activated and expanded to cause chronic GVHD with autoimmune manifestations in allogeneic recipients, and donor Treg cells can suppress this process.

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