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 language | English (US) |
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Pages (from-to) | 301-308 |
Number of pages | 8 |
Journal | American journal of respiratory and critical care medicine |
Volume | 177 |
Issue number | 3 |
DOIs | |
State | Published - Feb 1 2008 |
Keywords
- Costimulation
- Innate immunity
- Sepsis
ASJC Scopus subject areas
- Pulmonary and Respiratory Medicine
- Critical Care and Intensive Care Medicine