CD40 and CD80/86 act synergistically to regulate inflammation and mortality in polymicrobial sepsis

Anna Nolan, Michael Weiden, Ann Kelly, Yoshihiko Hoshino, Satomi Hoshino, Nehal Mehta, Jeffrey A. Gold

Research output: Contribution to journalArticle

68 Scopus citations

Abstract

Rationale: Costimulatory molecules, including the CD40-CD154 and CD80/86-CD28 dyads, play a prominent role in regulating inflammation in the adaptive immune response. Studies from our group and others suggest a potentially important role for these costimulatory cascades in innate immunity as well. Objectives: To determine the role of CD80/86 alone and in combination with CD40 in lethal polymicrobial sepsis in mice and humans. Methods: The murine cecal ligation and puncture (CLP) model was used to determine the role of CD80/86 alone and in combination with CD40 using wild-type mice, CD80/86 -/- mice, and novel CD40/80/86-/- mice. Expression of cell-bound and soluble costimulatory molecules was assessed in humans via ELISA and flow cytometry. Measurements and Main Results: Lethal CLP was associated with up-regulation of CD40 and CD80/86 and their respective ligands CD28 and CD154 on innate effector cells. Blockade or deletion of CD80/86 attenuated mortality and inflammatory cytokine production during CLP. CD40/80/86 -/- mice exhibited further reductions in mortality, lung injury, and inflammatory cytokine production compared with CD80/86-/- mice. Finally, humans with sepsis had increased monocyte expression of CD40 and CD80 compared with healthy control subjects; with higher levels in subjects requiring vasopressor support. Levels of soluble CD28 and CD154 were significantly higher in patients who died compared with those who lived. Conclusions: These data demonstrate a central role for CD40 and CD80/86 in the innateimmune response and suggest that combined inhibition of CD40 and CD80/86 may improve mortality in sepsis. Expression of costimulatory molecules may serve as biomarkers for outcome in septic patients.

Original languageEnglish (US)
Pages (from-to)301-308
Number of pages8
JournalAmerican journal of respiratory and critical care medicine
Volume177
Issue number3
DOIs
StatePublished - Feb 1 2008

Keywords

  • Costimulation
  • Innate immunity
  • Sepsis

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine
  • Critical Care and Intensive Care Medicine

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