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The Journal of Immunology, Vol 154, Issue 11 5715-5724, Copyright © 1995 by American Association of Immunologists
ARTICLES |
MJ Kleijmeer, MA Ossevoort, CJ van Veen, JJ van Hellemond, JJ Neefjes, WM Kast, CJ Melief and HJ Geuze
Department of Cell Biology, School of Medicine, Utrecht University, The Netherlands.
MHC class II (MHC-II) molecules bind fragments of exogenous Ags in an intracellular endocytotic compartment. In view of divergent data on the MHC-II distribution in different cell lines, it was of interest to localize MHC-II molecules in a natural and the most potent APC type, the dendritic cell (DC). By using immunogold labeling of ultrathin cryosections of cultured mouse spleen DC, we found that MHC-II molecules were present abundantly at the plasma membrane and in intracellular compartments containing internal membrane vesicles and/or membrane sheets. The majority of these compartments was situated late in the endocytotic route, as demonstrated by the late appearance (after a lag of 30 min) of internalized exogenous tracer. These compartments contained the lysosomal enzymes cathepsin D and beta-hexosaminidase, but lacked the late endosomal marker cation-dependent mannose-6- phosphate receptor. We conclude that most of the intracellular MHC-II molecules in cultured spleen DC reside in a compartment with (pre)lysosomal characteristics, resembling the so-called MHC-II- enriched compartments (MIIC), originally described in B cells. We also investigated whether the presence of MHC-II molecules in endocytotic compartments was related to the kinetics of Ag processing and presentation by these cells. Pulse-chase endocytosis experiments with hen egg lysozyme (HEL) as a model Ag showed that activated spleen DC were able to efficiently process and present this Ag to an HEL-specific T hybridoma cell line. However, presentation started only after a lag of 2 h and was maximal after 6 h. The difference in time between the arrival of Ag in proteolytic endocytotic compartments, in particular MIIC, and effective Ag presentation is discussed in the context of DC maturation.
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