The Journal of Experimental Medicine
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Published online 31 July 2006 doi:10.1084/jem.20060376
Rockefeller University Press, 0022-1007 $8.00
JEM, Volume 203, Number 8, 2021-2031
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ARTICLE

An inflammatory checkpoint regulates recruitment of graft-versus-host reactive T cells to peripheral tissues

Ronjon Chakraverty1, Daniel Côté2, Jennifer Buchli1, Pete Cotter1, Richard Hsu1, Guiling Zhao1, Teviah Sachs1, Costas M. Pitsillides2, Roderick Bronson4, Terry Means3, Charles Lin2, and Megan Sykes1

1 Transplantation Biology Research Center, Bone Marrow Transplantation Section, 2 Wellman Center for Photomedicine, 3 Center for Immunology and Inflammatory Diseases, Massachusetts General Hospital, and 4 Department of Pathology, Harvard Medical School, Boston, MA 02129

CORRESPONDENCE Megan Sykes: Megan.Sykes{at}tbrc.mgh.harvard.edu

Transfer of T cells to freshly irradiated allogeneic recipients leads to their rapid recruitment to nonlymphoid tissues, where they induce graft-versus-host disease (GVHD). In contrast, when donor T cells are transferred to established mixed chimeras (MCs), GVHD is not induced despite a robust graft-versus-host (GVH) reaction that eliminates normal and malignant host hematopoietic cells. We demonstrate here that donor GVH-reactive T cells transferred to MCs or freshly irradiated mice undergo similar expansion and activation, with similar up-regulation of homing molecules required for entry to nonlymphoid tissues. Using dynamic two-photon in vivo microscopy, we show that these activated T cells do not enter GVHD target tissues in established MCs, contrary to the dogma that activated T cells inevitably traffic to nonlymphoid tissues. Instead, we show that the presence of inflammation within a nonlymphoid tissue is a prerequisite for the trafficking of activated T cells to that site. Our studies help to explain the paradox whereby GVH-reactive T cells can mediate graft-versus-leukemia responses without inducing GVHD in established MCs.


Abbreviations used: BMT, BM transplantation; DLI, donor leukocyte infusion; GVH, graft-versus-host; GVHD, graft-versus-host disease; GVL, graft-versus-leukemia; MC, mixed chimera; TCD, T cell–depleted; TLR, Toll-like receptor.


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