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Cloned dendritic cells can present exogenous antigens on both MHC class I and class II molecules.

Z Shen, G Reznikoff, G Dranoff and K L Rock
J Immunol March 15, 1997, 158 (6) 2723-2730;
Z Shen
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G Reznikoff
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G Dranoff
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K L Rock
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Abstract

Pathways for presenting proteins from the extracellular fluids on MHC class I molecules have been described in macrophages. However, it is uncertain whether similar mechanisms exist in dendritic cells, because conventional preparations of these cells can be contaminated with macrophages. We addressed this issue by transducing granulocyte-macrophage CSF into bone marrow cultures followed by supertransfection with myc and raf oncogenes. These immortalized clones displayed dendritic morphology, and many expressed the dendritic cell-specific markers DEC-205 and 33D1 as well as high levels of MHC molecules and costimulatory molecules. Using these cloned dendritic cells, we found that exogenous OVA could be presented on both their MHC class I and class II molecules. This presentation was markedly enhanced when the Ag was particulate and internalized by phagocytosis. Presentation of particulate OVA on MHC class I molecules was insensitive to the weak base chloroquine, but was blocked by peptide aldehyde inhibitors of the proteasome, indicating that the class I-presented peptides were generated in the cytosol. Brefeldin A, which inhibits the exocytosis of newly synthesized proteins from the endoplasmic reticulum, also inhibited Ag presentation. These results establish that dendritic cells can present exogenous Ags on MHC class I molecules and appear to use a similar phagosome to cytosol pathway as macrophages. Therefore, dendritic cells are likely to play an important role in generating immune responses to tissue transplants and tumors in vivo. Furthermore, these findings provide an approach for targeting vaccine Ags into these cells to prime immune responses in vivo.

  • Copyright © 1997 by American Association of Immunologists

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The Journal of Immunology
Vol. 158, Issue 6
15 Mar 1997
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Cloned dendritic cells can present exogenous antigens on both MHC class I and class II molecules.
Z Shen, G Reznikoff, G Dranoff, K L Rock
The Journal of Immunology March 15, 1997, 158 (6) 2723-2730;

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Cloned dendritic cells can present exogenous antigens on both MHC class I and class II molecules.
Z Shen, G Reznikoff, G Dranoff, K L Rock
The Journal of Immunology March 15, 1997, 158 (6) 2723-2730;
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Print ISSN 0022-1767        Online ISSN 1550-6606