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The Journal of Immunology, 2000, 164: 3596-3599.
Copyright © 2000 by The American Association of Immunologists

Indoleamine 2,3-Dioxygenase Production by Human Dendritic Cells Results in the Inhibition of T Cell Proliferation

Patrick Hwu1,*, Mark X. Du{dagger}, Réjean Lapointe*, My Do*, Milton W. Taylor{dagger} and Howard A. Young{ddagger}

* Surgery Branch, Division of Clinical Sciences, National Cancer Institute, Bethesda, MD 20892; {dagger} Department of Biology, Indiana University, Bloomington, IN 47405; and {ddagger} National Cancer Institute-Frederick Cancer Research and Development Center, Frederick, MD 21702

Dendritic cells (DCs) play a key role in the activation and regulation of B and T lymphocytes. Production of indoleamine 2,3-dioxygenase (IDO) by macrophages has recently been described to result in inhibition of T cell proliferation through tryptophan degradation. Since DCs can be derived from monocytes, we sought to determine whether DCs could produce IDO which could potentially regulate T cell proliferation. Northern blot analysis of RNA from cultured monocyte-derived human DC revealed that IDO mRNA was induced upon activation with CD40 ligand and IFN-{gamma}. IDO produced from activated DCs was functionally active and capable of metabolizing tryptophan to kynurenine. Activated T cells were also capable of inducing IDO production by DCs, which was inhibited by a neutralizing Ab against IFN-{gamma}. DC production of IDO resulted in inhibition of T cell proliferation, which could be prevented using the IDO inhibitor 1-methyl-DL-tryptophan. These results suggest that activation of DCs induces the production of functional IDO, which causes depletion of tryptophan and subsequent inhibition of T cell proliferation. This may represent a potential mechanism for DCs to regulate the immune response.




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