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Blood, 1 March 2006, Vol. 107, No. 5, pp. 2045-2051. Prepublished online as a Blood First Edition Paper on November 3, 2005; DOI 10.1182/blood-2005-07-2828.
Submitted July 15, 2005
Department of Molecular Pharmacology and Chemistry, Department of Medicine, Memorial Sloan-Kettering Cancer Center, New York, NY, USA; Department of Pharmacology, Weill Graduate School of Medical Sciences of Cornell University, New York, NY, USA * Corresponding author; email: d-scheinberg{at}ski.mskcc.org.
MHC molecules carrying selected peptides will bind specifically to their cognate T cell receptor on individual clones of reactive T cells. Fluorescently labeled, tetrameric MHC-peptide complexes have been widely used to detect and quantitate antigen specific T cell populations via flow cytometry. We hypothesized that such MHC-peptide tetramers could also be used to selectively deplete unique reactive T cell populations, while leaving the remaining T cell repertoire and immune response intact. In this report, we successfully demonstrate that a tetramer-based depletion of T cells can be achieved in a murine model of allogeneic bone marrow transplantation. Depletion of a specific alloreactive population of donor splenocytes (<0.5% of CD8+ T cells) prior to transplantation significantly decreased morbidity and mortality from Graft-Versus-Host-Disease. There was no early re-growth of the antigen-specific T cells in the recipient and in vivo T cell proliferation was greatly reduced as well. Survival was increased greater than 3-fold over controls, yet the inherent anti-tumor activity of the transplant was retained. This method also provides the proof-of-concept for similar strategies to selectively remove other unwanted T cell clones, which could result in novel therapies for certain autoimmune disorders, T cell malignancies and solid organ graft rejection.
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