The extract of Japanese soybean, Kurosengoku activates the production of IL-12 and IFN-γ by DC or NK1.1(+) cells in a TLR4- and TLR2-dependent manner.
During the search for immuno-improving foods, we found that a variety of the Japanese soybean, Glycine max cv. Kurosengoku (Kurosengoku), which activated Type-1 immunity in a Toll-like receptor (TLR)4- and TLR2-dependent manner. Namely, the extract of Kurosengoku first caused production of IL-12 from DC and sequentially induced IFN-γ production by NK1.1(+) NK cells and NKT cells. The IFN-γ production was significantly blocked by neutralizing mAb against IL-12 or TLR4- and TLR2-deficient condition, indicating that TLR4- and TLR2-dependent activation of DC to produce IL-12 was essential for the production of IFN-γ from spleen cells by Kurosengoku. Moreover, the extract of Kurosengoku also enhanced production of IFN-γ from human PBMC by co-stimulation with anti-CD3 mAb in a TLR2- and TLR4-dependent manner. Thus, our findings strongly suggest that Kurosengoku might a novel immuno-improving food, which would be a useful tool for preventing the tip of immune balance in developed countries.
Division of Immunoregulation, Institute for Genetic Medicine, Hokkaido University, Sapporo 060-0815, Japan.
Sachi
S
Tanaka
Shin-ichi
S
Koizumi
Naoko
N
Makiuchi
Yuka
Y
Aoyagi
Emi
E
Quivy
Rieko
R
Mitamura
Tsutomu
T
Kano
Daiko
D
Wakita
Kenji
K
Chamoto
Hidemitsu
H
Kitamura
Takashi
T
Nishimura
D000818:Animals; D017252:CD3 Complex / Q000276:immunology; D003713:Dendritic Cells / Q000187:drug effects* / Q000276:immunology; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis*; D018664:Interleukin-12 / Q000032:analysis / Q000096:biosynthesis*; D007694:Killer Cells, Natural / Q000187:drug effects* / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D009000:Monocytes / Q000276:immunology; D055611:Natural Killer T-Cells / Q000187:drug effects* / Q000276:immunology; D010936:Plant Extracts / Q000494:pharmacology*; D013025:Glycine max / Q000737:chemistry / Q000276:immunology*; D013154:Spleen / Q000276:immunology; D051195:Toll-Like Receptor 2 / Q000235:genetics / Q000378:metabolism; D051197:Toll-Like Receptor 4 / Q000235:genetics / Q000378:metabolism
D017252:CD3 Complex; D010936:Plant Extracts; D051195:Toll-Like Receptor 2; D051197:Toll-Like Receptor 4; D018664:Interleukin-12; D007371:Interferon-gamma