Class I-restricted presentation of exogenous antigen acquired by Fcgamma receptor-mediated endocytosis is regulated in dendritic cells.
We evaluated MHC class I- and II-restricted presentation of exogenous antigen by mouse bone marrow-derived dendritic cells (DC) and splenic B cells. DC presented to class I-restricted transgenic T cells femtomolar concentrations of antigens from liposomes targeted to the IgG Fc receptor. Targeting these liposomes to surface immunoglobulin did not permit B cells to stimulate class I-restricted responses. Nevertheless, both DC and B cells presented antigen from liposomes targeted to these same receptors with equivalent efficiency to class II-restricted T cells. Acquisition of the capacity to present class II-restricted antigens required shorter periods of differentiation of DC than presentation of exogenous class I-restricted antigens. The latent period for class I-restricted presentation of exogenous antigen by DC could not be shortened by exposing them to lipopolysaccharide, double-stranded RNA or antibody to CD40. Class I presentation depended on expression of the TAP1 transporter. Our data are consistent with the existence of a regulated transport process present in DC which can convey exogenous antigen from endocytic vesicles to the cytosol.
Machy
P
P
Centre d'Immunologie INSERM-CNRS de Marseille-Luminy, France.
Serre
K
K
Leserman
L
L
D000071181:ATP Binding Cassette Transporter, Subfamily B, Member 2; D018528:ATP-Binding Cassette Transporters / Q000378:metabolism; D000818:Animals; D017951:Antigen Presentation; D002454:Cell Differentiation; D002460:Cell Line; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D004527:Egg Proteins / Q000276:immunology; D004705:Endocytosis / Q000276:immunology; D015395:Histocompatibility Antigens Class I / Q000378:metabolism*; D000949:Histocompatibility Antigens Class II / Q000378:metabolism; D008081:Liposomes; D051379:Mice; D008822:Mice, Transgenic; D010047:Ovalbumin / Q000276:immunology; D010446:Peptide Fragments; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics; D017452:Receptors, IgG / Q000378:metabolism*
D000071181:ATP Binding Cassette Transporter, Subfamily B, Member 2; D018528:ATP-Binding Cassette Transporters; D004527:Egg Proteins; D015395:Histocompatibility Antigens Class I; D000949:Histocompatibility Antigens Class II; D008081:Liposomes; C110366:OVA-8; D010446:Peptide Fragments; D016693:Receptors, Antigen, T-Cell, alpha-beta; D017452:Receptors, IgG; C073119:TAP1 protein, human; C486171:Tap1 protein, mouse; D010047:Ovalbumin