title: Mechanism of murine Vgamma1+ gamma delta T cell-mediated innate immune response against Listeria monocytogenes infection.
abstract: Murine gamma delta T cells participate in innate immune response against infection of the intracellular bacterium Listeria monocytogenes. In the present report, we analyzed the mechanism of the gamma delta T cell-mediated response against L. monocytogenes infection. gamma delta T cell-enriched spleen cells of L. monocytogenes-infected mice produced IFN-gamma in vitro in response to L. monocytogenes-infected spleen cells. The IFN-gamma production was abrogated by depletion of Vgamma1+ gamma delta T cells. IFN-gamma production of the Vgamma1+ gamma delta T cells in response to L. monocytogenes-infected spleen cells required IL-12. However, addition of Fab fragment of anti-TCR gamma delta monoclonal antibodies (mAb) failed to block the response, suggesting that the response requires no TCR-mediated antigen recognition. Interestingly, Vgamma1+ gamma delta T cells of naive mice also produced IFN-gamma in response to L. monocytogenes-infected spleen cells in an IL-12-dependent manner. Furthermore, the IL-12 receptor (IL-12R) gene was expressed on the Vgamma1+ gamma delta T cells of naive mice as well as those of L. monocytogenes-infected mice although naive alpha beta T cells lack IL-12R expression. All the results suggest that the Vgamma1+ gamma delta T cells participate in immune surveillance against intracellular bacterial infection through quick production of IFN-gamma in response to infection-induced IL-12 without antigen-driven clonal expansion and maturation.
authors.affiliation: Department of Immunology, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan. matsuzak@comb.u-ryykyu.ac.jp
authors.forename: Goro
authors.initials: G
authors.lastname: Matsuzaki
authors.forename: Hisakata
authors.initials: H
authors.lastname: Yamada
authors.forename: Kenji
authors.initials: K
authors.lastname: Kishihara
authors.forename: Yasunobu
authors.initials: Y
authors.lastname: Yoshikai
authors.forename: Kikuo
authors.initials: K
authors.lastname: Nomoto
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology / Q000494:pharmacology; D002478:Cells, Cultured / Q000187:drug effects / Q000276:immunology; D007111:Immunity, Cellular; D007113:Immunity, Innate; D007140:Immunoglobulin Fab Fragments / Q000276:immunology / Q000494:pharmacology; D007371:Interferon-gamma / Q000378:metabolism; D018664:Interleukin-12 / Q000494:pharmacology; D008089:Listeria monocytogenes / Q000276:immunology*; D008088:Listeriosis / Q000276:immunology*; D008213:Lymphocyte Activation; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000235:genetics / Q000276:immunology*; D018123:Receptors, Interleukin / Q000096:biosynthesis; D053707:Receptors, Interleukin-12; D013154:Spleen / Q000166:cytology; D016176:T-Lymphocyte Subsets / Q000187:drug effects / Q000276:immunology* / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D007140:Immunoglobulin Fab Fragments; D016692:Receptors, Antigen, T-Cell, gamma-delta; D018123:Receptors, Interleukin; D053707:Receptors, Interleukin-12; D018664:Interleukin-12; D007371:Interferon-gamma