title: MHC class II-dependent NK1.1+ gammadelta T cells are induced in mice by Salmonella infection.
abstract: We observed the emergence of a novel population of gammadelta T cells expressing NK1.1 Ag in the peritoneal cavity of mice infected with Salmonella choleraesuis. The NK1.1+gammadelta T cells accounted for approximately 20% of all gammadelta T cells emerging in the peritoneal cavity of C57BL/6 mice and expressed preferentially rearranged Vgamma4-Jgamma1 and Vdelta6.3-Ddelta1-Ddelta2-Jdelta1 genes with N diversity. The gammadelta T cells proliferated vigorously in response to PHA-treated spleen cells and produced IFN-gamma in the culture supernatant. However, spleen cells from Abetab-deficient mice were unable to stimulate the gammadelta T cells. Furthermore, the NK1.1+gammadelta T cells were stimulated not only by Chinese hamster ovary (CHO) cells expressing wild-type IAb but also by those expressing IAb/Ealpha52-68 or IAb/pigeon cytochrome c-derived analogue peptide complex. These proliferation activities were inhibited by mAb specific for IAb chain. Consistent with these findings, the emergence of NK1.1+gammadelta T cells was reduced in the peritoneal cavity of Abetab-deficient mice after Salmonella infection, whereas NK1.1+gammadelta T cells were rather abundant in the peritoneal cavity of Salmonella-infected beta2m-deficient mice. Moreover, the NK1.1+gammadelta T cells were easily identified in the thymus of beta2m-deficient but not Abetab-deficient mice. Our results indicated that MHC class II expression is essential for development and activation of NK1. 1+gammadelta T cells in the thymus and the periphery.
authors.affiliation: Laboratory of Host Defense and Germfree Life, Research Institute of Disease Mechanism and Control, Nagoya University School of Medicine, Nagoya, Japan.nishihit@tsuru.med.nagoya-u.ac.jp
authors.forename: H
authors.initials: H
authors.lastname: Nishimura
authors.forename: J
authors.initials: J
authors.lastname: Washizu
authors.forename: Y
authors.initials: Y
authors.lastname: Naiki
authors.forename: T
authors.initials: T
authors.lastname: Hara
authors.forename: Y
authors.initials: Y
authors.lastname: Fukui
authors.forename: T
authors.initials: T
authors.lastname: Sasazuki
authors.forename: Y
authors.initials: Y
authors.lastname: Yoshikai
mesh_terms: D000818:Animals; D000941:Antigens / Q000378:metabolism*; D000950:Antigens, Ly; D000954:Antigens, Surface; D001483:Base Sequence; D006224:Cricetinae; D017931:DNA Primers / Q000235:genetics; D018076:DNA, Complementary / Q000235:genetics; D016694:Gene Rearrangement, delta-Chain T-Cell Antigen Receptor; D015334:Gene Rearrangement, gamma-Chain T-Cell Antigen Receptor; D000949:Histocompatibility Antigens Class II / Q000235:genetics / Q000378:metabolism*; D037181:Lectins, C-Type; D008213:Lymphocyte Activation; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D055651:NK Cell Lectin-Like Receptor Subfamily B; D011506:Proteins / Q000378:metabolism*; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000378:metabolism*; D012481:Salmonella Infections, Animal / Q000235:genetics / Q000276:immunology*; D016176:T-Lymphocyte Subsets / Q000276:immunology*