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J. Exp. Med.,
Volume 189, Number 2, January 18, 1999 371-380
Receptor-mediated Induction of Dendritic Cell
Maturation and Major Histocompatibility Complex
Class I-restricted Antigen Presentation after Immune
Complex Internalization
By



From * Institut National de la Santé et de la Recherche Médicale CJF 95-01, Institut Curie,
Section Recherche, 75005 Paris, France; the Dendritic cells (DCs) express several receptors for the Fc portion of immunoglobulin (Ig)G
(Fc
Second University of Milan, Department of
Biotechnology and Biological Sciences, 20126 Milan, Italy; the § Department of Immunology,
University Hospital, G04.614, 3584 CX, Utrecht, The Netherlands; and the
Division of Molecular
Genetics, Graduate School of Medicine, Chiba University, Chuo-ku, Chiba 260-8670, Japan
R), which mediate internalization of antigen-IgG complexes (immune complexes, ICs)
and promote efficient major histocompatibility complex (MHC) class II-restricted antigen presentation. We now show that Fc
Rs have two additional specific attributes in murine DCs: the
induction of DC maturation and the promotion of efficient MHC class I-restricted presentation of peptides from exogenous, IgG-complexed antigens. Both Fc
R functions require the
Fc
R-associated
chain. Fc
R-mediated MHC class I-restricted antigen presentation is extremely sensitive and specific to immature DCs. It requires proteasomal degradation and is dependent on functional peptide transporter associated with antigen processing, TAP1-TAP2. By
promoting DC maturation and presentation on both MHC class I and II molecules, ICs should
efficiently sensitize DCs for priming of both CD4+ helper and CD8+ cytotoxic T lymphocytes
in vivo.
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