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Blood, 1 March 2008, Vol. 111, No. 5, pp. 2929-2940. Prepublished online as a Blood First Edition Paper on January 4, 2008; DOI 10.1182/blood-2007-06-096602.
TRANSPLANTATION Organ-derived dendritic cells have differential effects on alloreactive T cells1 Department of Medicine and Immunology, and 2 Department of Epidemiology and Biostatistics, Memorial Sloan-Kettering Cancer Center, New York, NY; 3 Department of Pathology, Immunology, and Laboratory Medicine, University of Florida College of Medicine, Gainesville; and 4 Department of Pathology, Brigham and Women's Hospital, Boston, MA Dendritic cells (DCs) are considered critical for the induction of graft-versus-host disease (GVHD) after bone marrow transplantation (BMT). In addition to their priming function, dendritic cells have been shown to induce organ-tropism through induction of specific homing molecules on T cells. Using adoptive transfer of CFSE-labeled cells, we first demonstrated that alloreactive T cells differentially up-regulate specific homing molecules in vivo. Host-type dendritic cells from the GVHD target organs liver and spleen or skin- and gut-draining lymph nodes effectively primed naive allogeneic T cells in vitro with the exception of liver-derived dendritic cells, which showed less stimulatory capacity. Gut-derived dendritic cells induced alloreactive donor T cells with a gut-homing phenotype that caused increased GVHD mortality and morbidity compared with T cells stimulated with dendritic cells from spleen, liver, and peripheral lymph nodes in an MHC-mismatched murine BMT model. However, in vivo analysis demonstrated that the in vitro imprinting of homing molecules on alloreactive T cells was only transient. In conclusion, organ-derived dendritic cells can efficiently induce specific homing molecules on alloreactive T cells. A gut-homing phenotype correlates with increased GVHD mortality and morbidity after murine BMT, underlining the importance of the gut in the pathophysiology of GVHD.
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