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Specificity of effector T lymphocytes in autologous graft-versus-host
disease: role of the major histocompatibility complex class II invariant
chain peptide
AD Hess, EC Bright, C Thoburn, GB Vogelsang, RJ Jones and MJ Kennedy
Bone Marrow Transplantation Unit, Oncology Center, The Johns Hopkins
University, Baltimore, MD 21287-8985, USA.
Administration of the immunosuppressive drug cyclosporine after autologous
bone marrow transplantation induces a systemic autoimmune syndrome
resembling graft-versus-host disease (GVHD). This syndrome termed
autologous GVHD has significant antitumor activity. Associated with
autologous GVHD is the development of T lymphocytes that recognize major
histocompatibility complex (MHC) class II determinants, including self. The
present studies attempted to characterize and define the molecular
specificity of the effector T lymphocytes in autologous GVHD induced in
patients with metastatic breast cancer. The results suggest that the
effector cells associated with human autologous GVHD are CD8+ T lymphocytes
expressing the alpha/beta T-cell receptor. Additional studies show that the
effector T cells recognize MHC class II antigens in association with a
peptide from the invariant chain (CLIP). Pretreatment of autologous
lymphoblast target cells with anti-CLIP antibody completely blocked lysis
mediated by autologous GVHD effector T cells. On the other hand, force
loading this peptide markedly enhanced the susceptibility of the target
cells to recognition by the autoreactive T cells. The recognition of the
MHC class II CLIP complex may account for the novel specificity of the
effector T cells associated with human autologous GVHD. Moreover,
identification of the target peptide may allow for the development of novel
immunotherapeutic strategies to enhance the antitumor efficacy of
autologous GVHD.
Volume 89,
Issue 6,
pp. 2203-2209,
03/15/1997
Copyright © 1997 by The American Society of Hematology

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