Aryl hydrocarbon receptor in combination with Stat1 regulates LPS-induced inflammatory responses

Akihiro Kimura, Tetsuji Naka, Taisuke Nakahama, Ichino Chinen, Kazuya Masuda, Keiko Nohara, Yoshiaki Fujii-Kuriyama, Tadamitsu Kishimoto

研究成果: Article査読

243 被引用数 (Scopus)

抄録

Toll-like receptor (TLR) signals perform a crucial role in innate immune responses to pathogens. In this study, we found that the aryl hydrocarbon receptor (Ahr) negatively regulates inflammatory responses mediated by lipopolysaccharide (LPS) in macrophages. Ahr was induced in macrophages stimulated by LPS, but not by transforming growth factor (TGF)-β plus interleukin (IL)-6, which can induce Ahr in naive T cells. The production of IL-6 and tumor necrosis factor (TNF)-α by LPS was significantly elevated in Ahr-deficient macrophages compared with that in wild-type (WT) cells. Ahr-deficient mice were more highly sensitive to LPS-induced lethal shock than WT mice. Signal transducer and activator of transcription 1 (Stat1) deficiency, as well as Ahr deficiency, augmented LPS-induced IL-6 production. We found that Ahr forms a complex with Stat1 and nuclear factor-kappa B (NF-κB) in macrophages stimulated by LPS, which leads to inhibition of the promoter activity of IL-6. Ahr thus plays an essential role in the negative regulation of the LPS signaling pathway through interaction with Stat1.

本文言語English
ページ(範囲)2027-2035
ページ数9
ジャーナルJournal of Experimental Medicine
206
9
DOI
出版ステータスPublished - 2009 8 31

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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