Toll-like receptor-dependent IL-12 production by dendritic cells is required for activation of natural killer cell-mediated Type-1 immunity induced by Chrysanthemum Coronarium L.

Sachi Tanaka, Shin Ichi Koizumi, Kazutaka Masuko, Naoko Makiuchi, Yuka Aoyagi, Emi Quivy, Rieko Mitamura, Tsutomu Kano, Takayuki Ohkuri, Daiko Wakita, Kenji Chamoto, Hidemitsu Kitamura, Takashi Nishimura

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Type-1 immunity has an essential role for our host defenses against cancer and outer pathogens such as bacteria and virus. We demonstrated here that the edible plant extract of Chrysanthemum coronarium L. (C. coronarium) remarkably activates Type-1 immunity in a Toll-like receptor (TLR)2-, TLR4-, and TLR9-dependent manner. In the present experiments, the extract of C. coronarium significantly induces interferon (IFN)-γ production by mouse spleen cells. In addition, the IFN-γ production by spleen cells was completely blocked by the addition of anti-Interleukin (IL)-12 monoclonal antibodies. We confirmed that NK1.1 + natural killer (NK) cells, NKT cells, and CD11c + dendritic cells (DC) were immediately activated after the stimulation with the extract of C. coronarium and the IFN-γ production was abolished in NK1.1 + cell-depleted spleen cells. The stimulation with the extract of C. coronarium caused DC maturation involving with up-regulations of surface expression levels of MHC class I, MHC class II, CD40, and CD86 as well as induction of IL-12 production. The IFN-γ production induced by the extract was significantly reduced in the spleen cells depleted CD11c + cells. Furthermore, the IFN-γ production after the stimulation was strongly reduced in TLR4- and partially in TLR2- and TLR9-deficient spleen cells. Thus, we demonstrated the cellular mechanism for the activation of Type-1 immunity via NK cells, NKT cells, and DC by the extract of C. coronarium. These findings strongly suggest that C. coronarium would be a promising immuno-improving adjuvant, which might be useful for prevention of infectious, cancer, and allergic diseases through the activation of Type-1 immunity.

Original languageEnglish
Pages (from-to)226-232
Number of pages7
JournalInternational Immunopharmacology
Volume11
Issue number2
DOIs
Publication statusPublished - Feb 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Immunology and Allergy
  • Immunology
  • Pharmacology

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