title: Essential role of Toll-like receptors for dendritic cell and NK1.1(+) cell-dependent activation of type 1 immunity by Lactobacillus pentosus strain S-PT84.
abstract: Activation of type 1 immunity plays a critical role in host defense mechanisms against infectious disease and tumor. Lactic acid bacteria, existing in the gastrointestinal tract, are one of the powerful tools to induce a type-1-dominant immunity, which may improve Th2-dependent allergic diseases. In the present work, we found that an oral intake of Lactobacillus pentosus strain, S-PT84 into mice significantly enhanced NK activity of spleen cells in vivo. We further revealed that NK1.1 positive NK cells and NKT cells are responsible cells for producing IFN-gamma after stimulation with S-PT84 in vitro. S-PT84 induced IFN-gamma-producing cells through activation of IL-12 production by CD11c(+)DCs in Toll-like receptor (TLR) 2- and/or TLR4-dependent manner. Interestingly, direct interaction between DCs and NK1.1(+) cells was also essential for the IFN-gamma production in response to the S-PT84 stimulation. Therefore, we concluded that S-PT84 effectively promoted type 1 immunity through IL-12 and IFN-gamma which were produced by DCs and NK1.1(+) cells, respectively. Thus, S-PT84 would be a nice immune modulator for improving immunobalance, which plays a pivotal role for controlling allergy, infectious diseases and tumor.
authors.affiliation: Division of Immunoregulation, Institute for Genetic Medicine, Hokkaido University, Sapporo 060-0815, Japan.
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Koizumi
authors.forename: Daiko
authors.initials: D
authors.lastname: Wakita
authors.forename: Tomomi
authors.initials: T
authors.lastname: Sato
authors.forename: Rieko
authors.initials: R
authors.lastname: Mitamura
authors.forename: Takayuki
authors.initials: T
authors.lastname: Izumo
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Shibata
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Kiso
authors.forename: Kenji
authors.initials: K
authors.lastname: Chamoto
authors.forename: Yuji
authors.initials: Y
authors.lastname: Togashi
authors.forename: Hidemitsu
authors.initials: H
authors.lastname: Kitamura
authors.forename: Takashi
authors.initials: T
authors.lastname: Nishimura
mesh_terms: D000818:Animals; D000950:Antigens, Ly / Q000276:immunology*; D018845:CD11 Antigens / Q000276:immunology; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000276:immunology*; D007371:Interferon-gamma / Q000276:immunology; D018664:Interleukin-12 / Q000276:immunology; D007694:Killer Cells, Natural / Q000276:immunology; D007778:Lactobacillus / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D055651:NK Cell Lectin-Like Receptor Subfamily B / Q000276:immunology*; D013154:Spleen / Q000166:cytology / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology; D051195:Toll-Like Receptor 2 / Q000276:immunology*; D051197:Toll-Like Receptor 4 / Q000276:immunology*
chemical_list: D000950:Antigens, Ly; D018845:CD11 Antigens; C527211:Klrb1c protein, mouse; D055651:NK Cell Lectin-Like Receptor Subfamily B; C493486:Tlr2 protein, mouse; C493487:Tlr4 protein, mouse; D051195:Toll-Like Receptor 2; D051197:Toll-Like Receptor 4; D018664:Interleukin-12; D007371:Interferon-gamma