CRTH2 is a critical regulator of neutrophil migration and resistance to polymicrobial sepsis

Makoto Ishii, Koichiro Asano, Ho Namkoong, Sadatomo Tasaka, Kosuke Mizoguchi, Takahiro Asami, Hirofumi Kamata, Yoshifumi Kimizuka, Hiroshi Fujiwara, Yohei Funatsu, Shizuko Kagawa, Jun Miyata, Ken Ishii, Masataka Nakamura, Hiroyuki Hirai, Kinya Nagata, Steven L. Kunkel, Naoki Hasegawa, Tomoko Betsuyaku

研究成果: Article査読

36 被引用数 (Scopus)

抄録

Although arachidonic acid cascade has been shown to be involved in sepsis, little is known about the role of PGD2 and its newly found receptor, chemoattractant receptor-homologous molecule expressed on Th2 cells (CRTH2), on the septic response. Severe sepsis is associated with the failure of neutrophil migration. To investigate whether CRTH2 influences neutrophil recruitment and the lethality during sepsis, sepsis was induced by cecal ligation and puncture (CLP) surgery in mice. CRTH2 knockout (CRTH2 -/-) mice were highly resistant to CLP-induced sepsis, which was associated with lower bacterial load and lower production of TNF-α, IL-6, and CCL3. IL-10, an anti-inflammatory cytokine, was higher in CRTH2 -/- mice, blunting CLP-induced lethality in CRTH2 -/- mice. Neutrophil accumulation in the peritoneum was more pronounced after CLP in CRTH22/2 mice, which was associated with higher CXCR2 levels in circulating neutrophils. Furthermore, sepsis caused a decrease in the level of acetylation of histone H3, an activation mark, at the CXCR2 promoter in wild-type neutrophils, suggesting that CXCR2 expression levels are epigenetically regulated. Finally, both pharmacological depletion of neutrophils and inhibition of CXCR2 abrogated the survival benefit in CRTH2 -/- mice. These results demonstrate that genetic ablation of CRTH2 improved impaired neutrophil migration and survival during severe sepsis, which was mechanistically associated with epigenetic-mediated CXCR2 expression. Thus, CRTH2 is a potential therapeutic target for polymicrobial sepsis. Copyright

本文言語English
ページ(範囲)5655-5664
ページ数10
ジャーナルJournal of Immunology
188
11
DOI
出版ステータスPublished - 2012 6月 1

ASJC Scopus subject areas

  • 免疫アレルギー学
  • 免疫学

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