Document Detail

CRTH2 is a critical regulator of neutrophil migration and resistance to polymicrobial sepsis.
MedLine Citation:
PMID:  22544936     Owner:  NLM     Status:  MEDLINE    
Although arachidonic acid cascade has been shown to be involved in sepsis, little is known about the role of PGD(2) 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 CRTH2(-/-) 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.
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
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2012-04-27
Journal Detail:
Title:  Journal of immunology (Baltimore, Md. : 1950)     Volume:  188     ISSN:  1550-6606     ISO Abbreviation:  J. Immunol.     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-05-21     Completed Date:  2012-08-14     Revised Date:  2013-06-25    
Medline Journal Info:
Nlm Unique ID:  2985117R     Medline TA:  J Immunol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5655-64     Citation Subset:  AIM; IM    
Division of Pulmonary Medicine, Department of Medicine, Keio University School of Medicine, Tokyo 160-8582, Japan.
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MeSH Terms
Bacterial Load / immunology
Cecum / surgery
Cell Movement / genetics,  immunology*
Cell Survival / genetics,  immunology
Cytokines / physiology
Disease Models, Animal
Disease Resistance / genetics,  immunology
Inflammation Mediators / physiology
Mice, Inbred BALB C
Mice, Knockout
Neutrophils / immunology*
Receptors, Immunologic / deficiency,  physiology*
Receptors, Prostaglandin / deficiency,  physiology*
Sepsis / immunology*,  microbiology,  prevention & control
Grant Support
Reg. No./Substance:
0/Cytokines; 0/Inflammation Mediators; 0/Receptors, Immunologic; 0/Receptors, Prostaglandin; 0/prostaglandin D2 receptor

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