NOD2-mediated Suppression of CD55 on Neutrophils Enhances C5a Generation During Polymicrobial Sepsis

Sae Jin Oh, Ji Hyung Kim, Doo Hyun Chung

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Nucleotide-binding oligomerization domain (NOD) 2 is a cytosolic protein that plays a defensive role in bacterial infection by sensing peptidoglycans. C5a, which has harmful effects in sepsis, interacts with innate proteins. However, whether NOD2 regulates C5a generation during sepsis remains to be determined. To address this issue, cecal ligation & puncture (CLP)-induced sepsis was compared in wild type and Nod2-/- mice. Nod2-/- mice showed lower levels of C5a, IL-10, and IL-1β in serum and peritoneum, but higher survival rate during CLP-induced sepsis compared to wild type mice. Injection of recombinant C5a decreased survival rates of Nod2-/- mice rate during sepsis, whereas it did not alter those in wild type mice. These findings suggest a novel provocative role for NOD2 in sepsis, in contrast to its protective role during bacterial infection. Furthermore, we found that NOD2-mediated IL-10 production by neutrophils enhanced C5a generation by suppressing CD55 expression on neutrophils in IL-1β-dependent and/or IL-1β-independent manners, thereby aggravating CLP-induced sepsis. SB203580, a receptor-interacting protein 2 (RIP2) inhibitor downstream of NOD2, reduced C5a generation by enhancing CD55 expression on neutrophils, resulting in attenuation of polymicrobial sepsis. Therefore, we propose a novel NOD2-mediated complement cascade regulatory pathway in sepsis, which may be a useful therapeutic target.

Original languageEnglish
Article numbere1003351
JournalPLoS Pathogens
Volume9
Issue number5
DOIs
Publication statusPublished - 2013 May 1
Externally publishedYes

Fingerprint

Sepsis
Neutrophils
Interleukin-1
Bacterial Infections
Interleukin-10
Receptor-Interacting Protein Serine-Threonine Kinases
Peptidoglycan
Peritoneum
Punctures
Ligation
Proteins
Nucleotides
Injections
Serum

ASJC Scopus subject areas

  • Microbiology
  • Parasitology
  • Virology
  • Immunology
  • Genetics
  • Molecular Biology

Cite this

NOD2-mediated Suppression of CD55 on Neutrophils Enhances C5a Generation During Polymicrobial Sepsis. / Oh, Sae Jin; Kim, Ji Hyung; Chung, Doo Hyun.

In: PLoS Pathogens, Vol. 9, No. 5, e1003351, 01.05.2013.

Research output: Contribution to journalArticle

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