title: H2-O influence on antigen presentation in H2-E-expressing mice.
abstract: MHC class II molecules sample peptides generated in the endosomal/lysosomal system for cell surface presentation to CD4+ T cells. Peptide loading requires the endosomal/lysosomal resident HLA-DM (DM; H2-DM, mouse), but in B cells, DM is tightly associated with HLA-DO (DO; H2-O, mouse). We have previously shown that H2-O differentially modulates the processing and presentation of different antigenic epitopes on H2-Ab molecules. Using H2-Ead-transgenic mice, we here show that presentation of different epitopes by H2-Ed/b molecules is similarly influenced by H2-O after membrane immunoglobulin-mediated uptake of antigen. In addition, B cells from H2-Ead-transgenic mice (which co-express H2-Ab and H2-Ed/b molecules) show an altered pattern of presentation of H2-Ab-restricted epitopes. In H2-Ead-transgenic, H2-O-deficient mice, further changes in the peptide repertoire were observed. Thus, H2-Ed/b expression influences the epitopes presented by H2-Ab, and this effect is further altered by expression of H2-O.
authors.affiliation: Johnson & Johnson Pharmaceutical Research & Development, 3210 Merryfield Row, San Diego, CA 92121, USA.
authors.forename: Christopher
authors.initials: C
authors.lastname: Alfonso
authors.forename: G Stuart
authors.initials: GS
authors.lastname: Williams
authors.forename: Lars
authors.initials: L
authors.lastname: Karlsson
mesh_terms: D000818:Animals; D017951:Antigen Presentation / Q000502:physiology*; D001402:B-Lymphocytes / Q000378:metabolism; D006183:H-2 Antigens / Q000235:genetics / Q000378:metabolism*; D000949:Histocompatibility Antigens Class II / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008822:Mice, Transgenic
chemical_list: D006183:H-2 Antigens; C416186:H-2O antigen; D000949:Histocompatibility Antigens Class II