title: Partially TAP-independent protection against Listeria monocytogenes by H2-M3-restricted CD8+ T cells.
abstract: Effective protection against Listeria monocytogenes requires Ag-specific CD8(+) T cells. A substantial proportion of CD8(+) T cells activated during L. monocytogenes infection of C57BL/6 mice are restricted by the MHC class Ib molecule H2-M3. In this study, an H2-M3-restricted CD8(+) T cell clone specific for a known H2-M3 epitope (fMIGWII) was generated from L. monocytogenes-infected mice. The clone was cytotoxic, produced IFN-gamma, and could mediate strong protection against L. monocytogenes when transferred to infected mice. Macrophages pulsed with heat-killed LISTERIAE: presented Ag to the clone in a TAP-independent manner. Both TAP-independent and -dependent processing occurred in vivo, as TAP-deficient mice infected with L. monocytogenes were partially protected by adoptive transfer of the clone. This is the first example of CD8(+) T cell-mediated, TAP-independent protection against a pathogen in vivo, confirming the importance of alternative MHC class I processing pathways in the antibacterial immunity.
authors.affiliation: Department of Immunology, Max Planck Institute for Infection Biology, Berlin, Germany.
authors.forename: M S
authors.initials: MS
authors.lastname: Rolph
authors.forename: S H
authors.initials: SH
authors.lastname: Kaufmann
mesh_terms: D000071181:ATP Binding Cassette Transporter, Subfamily B, Member 2; D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000502:physiology*; D019264:Adoptive Transfer; D000818:Animals; D017951:Antigen Presentation; D000942:Antigens, Bacterial / Q000008:administration & dosage / Q000276:immunology / Q000378:metabolism; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000382:microbiology* / Q000637:transplantation; D002460:Cell Line; D002999:Clone Cells / Q000637:transplantation; D003602:Cytotoxicity, Immunologic; D018984:Epitopes, T-Lymphocyte / Q000008:administration & dosage / Q000276:immunology / Q000378:metabolism; D005260:Female; D006183:H-2 Antigens / Q000378:metabolism / Q000502:physiology*; D015395:Histocompatibility Antigens Class I / Q000378:metabolism / Q000502:physiology*; D007117:Immunization, Secondary; D007279:Injections, Subcutaneous; D008089:Listeria monocytogenes / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D010446:Peptide Fragments / Q000008:administration & dosage / Q000276:immunology / Q000378:metabolism; D016176:T-Lymphocyte Subsets / Q000276:immunology* / Q000382:microbiology* / Q000637:transplantation
chemical_list: D000071181:ATP Binding Cassette Transporter, Subfamily B, Member 2; D018528:ATP-Binding Cassette Transporters; D000942:Antigens, Bacterial; D018984:Epitopes, T-Lymphocyte; D006183:H-2 Antigens; C078177:H2-M3 antigen; D015395:Histocompatibility Antigens Class I; D010446:Peptide Fragments; C073119:TAP1 protein, human; C486171:Tap1 protein, mouse