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J. Exp. Med.,
Volume 189, Number 12, June 21, 1999 1981-1986
Production by
CD8
+ Lymphoid Dendritic Cells
By

From the * Department of Immunology, Keio University School of Medicine, Shinjuku-ku, Tokyo
160-8582, Japan; the We investigated the role of antigen-presenting cells in early interferon (IFN)-
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
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-
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-
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-
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-
when cultured in the presence of IL-12. Intracellular immunofluorescence analysis confirmed
the IFN-
production from DCs. It was further shown that IFN-
was produced predominantly by CD8
+ lymphoid DCs rather than CD8
myeloid DCs. Collectively, our data indicated that DCs are potent in producing IFN-
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.
c knockout mouse;
natural killer cells;
Listeria monocytogenes
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