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Published online before print May 22, 2003
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* The Burn and Shock Trauma Institute, Department of Surgery, and
Department of Cell Biology, Neurobiology, and Anatomy, Loyola University Medical Center, Maywood, Illinois
Correspondence: Douglas E. Faunce, Ph.D., The Burn and Shock Trauma Institute, Department of Surgery, Loyola University Medical Center, Bldg. 110, Rm. 4221, 2160 So. First Ave., Maywood, IL. E-mail: dfaunce{at}lumc.edu
Natural killer T (NKT) cells are known to modulate T cell responses during autoimmunity, tolerance, and antitumor immunity; however, their potential role in regulating the immune response to injury has not been reported. Using a murine model of burn injury, we investigated whether CD1d-restricted NKT cells played a role in the T cell suppression that occurs early after injury. A functional role for CD1d stimulation of NKT cells in the injury-related immune suppression was demonstrated by experiments in which the suppression of antigen (Ag)-specific delayed-type hypersensitivity and in vitro T cell-proliferative responses were prevented if mice were given anti-CD1d monoclonal antibody (mAb) systemically just before injury. The CD1d-NKT cell-dependent suppression of the T cell response after injury occurred in the absence of quantitative changes in NKT cells themselves or CD1d+ Ag-presenting cells. We observed that elevated production of the immunosuppressive cytokine interleukin (IL)-4 correlated with burn-induced immune dysfunction, and we found that NKT cells but not conventional T cells were the source of IL-4 early after injury. Lastly, we observed that the injury-induced production of NKT cell-derived IL-4 could be blocked by systemic treatment of burn-injured mice with anti-CD1d mAb. Together, our results reveal a novel mechanism involving CD1d stimulation of NKT cells in the onset of T cell suppression that occurs subsequent to injury.
Key Words: natural killer T cells • burns • immune suppression
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