Antigen storage compartments in mature dendritic cells facilitate prolonged cytotoxic T lymphocyte cross-priming capacity.
Dendritic cells (DCs) are crucial for priming of naive CD8(+) T lymphocytes to exogenous antigens, so-called "cross-priming." We report that exogenous protein antigen can be conserved for several days in mature DCs, coinciding with strong cytotoxic T lymphocyte cross-priming potency in vivo. After MHC class I peptide elution, protein antigen-derived peptide presentation is efficiently restored, indicating the presence of an intracellular antigen depot. We characterized this depot as a lysosome-like organelle, distinct from MHC class II compartments and recently described early endosomal compartments that allow acute antigen presentation in MHC class I. The storage compartments we report here facilitate continuous supply of MHC class I ligands. This mechanism ensures sustained cross-presentation by DCs, despite the short-lived expression of MHC class I-peptide complexes at the cell surface.
Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, P.O. Box 9600, 2300 RC Leiden, The Netherlands.
Nadine
N
van Montfoort
Marcel G
MG
Camps
Selina
S
Khan
Dmitri V
DV
Filippov
Jimmy J
JJ
Weterings
Janice M
JM
Griffith
Hans J
HJ
Geuze
Thorbald
T
van Hall
J Sjef
JS
Verbeek
Cornelis J
CJ
Melief
Ferry
F
Ossendorp
D000818:Animals; D017951:Antigen Presentation / Q000276:immunology; D000941:Antigens / Q000276:immunology*; D002451:Cell Compartmentation / Q000276:immunology*; D002454:Cell Differentiation / Q000276:immunology*; D002462:Cell Membrane / Q000378:metabolism; D045142:Cross-Priming / Q000276:immunology*; D003713:Dendritic Cells / Q000166:cytology* / Q000276:immunology* / Q000648:ultrastructure; D015395:Histocompatibility Antigens Class I / Q000276:immunology; D042541:Intracellular Space / Q000378:metabolism; D008247:Lysosomes / Q000378:metabolism / Q000648:ultrastructure; D051379:Mice; D010455:Peptides / Q000276:immunology; D055550:Protein Stability; D011971:Receptors, Immunologic / Q000378:metabolism; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D013997:Time Factors
D000941:Antigens; D015395:Histocompatibility Antigens Class I; D010455:Peptides; D011971:Receptors, Immunologic