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J. Exp. Med., Volume 189, Number 12, June 21, 1999 1981-1986

Interleukin 12-dependent Interferon gamma  Production by CD8alpha + Lymphoid Dendritic Cells

By Toshiaki Ohteki,* Taro Fukao,* Kazutomo Suzue,* Chikako Maki,* Mamoru Ito,Dagger Masataka Nakamura,§ and Shigeo Koyasu*

From the * Department of Immunology, Keio University School of Medicine, Shinjuku-ku, Tokyo 160-8582, Japan; the Dagger  Laboratory of Immunology, Central Institute for Experimental Animals, Kawasaki 216-0001, Japan; and the § Human Gene Sciences Center, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo 113, Japan

We investigated the role of antigen-presenting cells in early interferon (IFN)-gamma production in normal and recombinase activating gene 2-deficient (Rag-2-/-) mice in response to Listeria monocytogenes (LM) infection and interleukin (IL)-12 administration. Levels of serum IFN-gamma in Rag-2-/- mice were comparable to those of normal mice upon either LM infection or IL-12 injection. Depletion of natural killer (NK) cells by administration of anti-asialoGM1 antibodies had little effect on IFN-gamma levels in the sera of Rag-2-/- mice after LM infection or IL-12 injection. Incubation of splenocytes from NK cell-depleted Rag-2-/- mice with LM resulted in the production of IFN-gamma that was completely blocked by addition of anti-IL-12 antibodies. Both dendritic cells (DCs) and monocytes purified from splenocytes were capable of producing IFN-gamma when cultured in the presence of IL-12. Intracellular immunofluorescence analysis confirmed the IFN-gamma production from DCs. It was further shown that IFN-gamma was produced predominantly by CD8alpha + lymphoid DCs rather than CD8alpha - myeloid DCs. Collectively, our data indicated that DCs are potent in producing IFN-gamma in response to IL-12 produced by bacterial infection and play an important role in innate immunity and subsequent T helper cell type 1 development in vivo.

Key words: recombinase-activating gene 2 knockout mouse;  nonobese diabetic-severe combined immunodeficiency disease mouse;  gamma c knockout mouse;  natural killer cells;  Listeria monocytogenes


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