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Institut Fédératif de Recherche Necker-Enfants Malades,
*
Unité Mixte de Recherche 8603, Centre National de la Recherche Scientifique/Université Paris-V,
Institut National de la Santé et de la Recherche Médicale, Unité 25, and
Pathology Department, Hôpital Necker-Enfants Malades, Faculté Necker, Université Paris-V, Paris, France
Immature dendritic cells (DC) sample Ags within nonlymphoid tissues
and acquire exogenous proteins/pathogens via scavenger receptors or Ig
FcR such as Fc
R and Fc
R. IgA is present in a significant
proportion among serum Ig and is the main isotype in mucosae, where DC
are numerous. We found that a functional Fc
R (CD89) was expressed in
situ and in vitro on interstitial-type DC but not on Langerhans
cell-type DC. Interstitial-type DC expressed CD89 as a 50- to 75-kDa
glycoprotein with a 32-kDa protein core, which was down-regulated upon
addition of TGF-
1. DC, Fc
R specifically, bound IgA1 and IgA2.
Cross-linking of CD89 on DC triggered endocytosis in time-dependent
manner. In addition, internalization of polymeric IgA complexes induced
the production of IL-10 and DC activation, as reflected by
up-regulation of CD86 costimulatory molecules, class II MHC expression,
and increased allostimulatory activity. Therefore, interstitial-type DC
may use Fc
R-mediated Ag sampling in the subepithelium to check
tissue integrity while Langerhans cells inside epithelial layers may
neglect IgA immune complexes.
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