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From the * CNR Centre of Cellular and Molecular Pharmacology, Milan 20129, Italy; The signals controlling the checkpoints of dendritic cells (DC) maturation and the correlation
between phenotypical and functional maturational stages were investigated in a defined model
system of growth factor-dependent immature mouse DC. Three sequential stages of DC maturation (immature, mature, and apoptotic) were defined and characterized. Immature DC
(stage 1) had low expression of costimulatory molecules, highly organized cytoskeleton, focal adhesion plaques, and slow motility; accordingly, they were very efficient in antigen uptake
and processing of soluble proteins. Further, at this stage most of major histocompatibility complex class II molecules were within cytoplasmic compartments consistent with a poor allostimulatory capacity. Bacteria or cytokines were very efficient in inducing progression from stage 1 towards stage 2 (mature). Morphological changes were observed by confocal analysis including
depolymerization of F-actin and loss of vinculin containing adhesive structures which correlates
with acquisition of high motility. Antigen uptake and presentation of native protein antigen was reduced. In contrast, presentation of immunogenic peptides and allostimulatory activity
became very efficient and secretion of IL-12 p75 was detectable after antigen presentation. This
functional DC maturation ended by apoptotic cell death, and no reversion to the immature
phenotype was observed.
Roche
Milano Ricerche, Milan 20132, Italy; § Centre d'Immunologie INSERM-CNRS de Marseille
Luminy, Parc Scientifique de Luminy, Case 906, Marseille 13288, France
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