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J. Exp. Med., Volume 189, Number 2, January 18, 1999 371-380

Fcgamma Receptor-mediated Induction of Dendritic Cell Maturation and Major Histocompatibility Complex Class I-restricted Antigen Presentation after Immune Complex Internalization

By Armelle Regnault,* Danielle Lankar,* Valérie Lacabanne,* Ana Rodriguez,* Clotilde Théry,* Maria Rescigno,Dagger Takashi Saito,parallel Sjef Verbeek,§ Christian Bonnerot,* Paola Ricciardi-Castagnoli,Dagger and Sebastian Amigorena*

From * Institut National de la Santé et de la Recherche Médicale CJF 95-01, Institut Curie, Section Recherche, 75005 Paris, France; the Dagger  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 parallel  Division of Molecular Genetics, Graduate School of Medicine, Chiba University, Chuo-ku, Chiba 260-8670, Japan

Dendritic cells (DCs) express several receptors for the Fc portion of immunoglobulin (Ig)G (Fcgamma 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 Fcgamma 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 Fcgamma R functions require the Fcgamma R-associated gamma  chain. Fcgamma 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.

Key words: Fc receptors;  dendritic cells;  antigen presentation;  immune complexes;  cross-priming


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