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© Research
Publication : Journal of immunology (Baltimore, Md. : 1950)

In vivo, dendritic cells can cross-present virus-like particles using an endosome-to-cytosol pathway

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Journal of immunology (Baltimore, Md. : 1950) - 01 Sep 2003

Morón VG, Rueda P, Sedlik C, Leclerc C

Link to Pubmed [PMID] – 12928368

J. Immunol. 2003 Sep;171(5):2242-50

Recombinant parvovirus-like particles (PPV-VLPs) are particulate exogenous Ags that induce strong CTL response in the absence of adjuvant. In the present report to decipher the mechanisms responsible for CTL activation by such exogenous Ag, we analyzed ex vivo and in vitro the mechanisms of capture and processing of PPV-VLPs by dendritic cells (DCs). In vivo, PPV-VLPs are very efficiently captured by CD8alpha- and CD8alpha+ DCs and then localize in late endosomes of DCs. Macropinocytosis and lipid rafts participate in PPV-VLPs capture. Processing of PPV-VLPs does not depend upon recycling of MHC class I molecules, but requires vacuolar acidification as well as proteasome activity, TAP translocation, and neosynthesis of MHC class I molecules. This study therefore shows that in vivo DCs can cross-present PPV-VLPs using an endosome-to-cytosol processing pathway.

http://www.ncbi.nlm.nih.gov/pubmed/12928368