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Journal Article
Research Support, Non-U.S. Gov't
Dendritic cell aggresome-like-induced structure formation and delayed antigen presentation coincide in influenza virus-infected dendritic cells.
Journal of Immunology 2005 July 16
Influenza virus infection induces maturation of murine dendritic cells (DCs), which is most important for the initiation of an immune response. However, in contrast to EL-4 and MC57 cells, DCs present viral CTL epitopes with a delay of up to 10 h. This delay in Ag presentation coincides with the up-regulation of MHC class I molecules as well as costimulatory molecules on the cell surface and the accumulation of newly synthesized ubiquitinated proteins in large cytosolic structures, called DC aggresome-like-induced structures (DALIS). These structures were observed previously after LPS-induced maturation of DCs, and it was speculated that they play a role in the regulation of MHC class I Ag presentation. Our findings provide the first evidence for a connection between DC maturation, MHC class I-restricted Ag presentation, and DALIS formation, which is further supported by the observation that DALIS contain ubiquitinated influenza nucleoprotein.
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