Inhibition of sepsis-induced inflammatory response by β1-adrenergic antagonists

Irada Ibrahim-Zada, Peter Rhee, Christopher T. Gomez, John Weller, Randall S. Friese

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

BACKGROUND: Although previous studies have described potential benefits of nonselective β-adrenergic antagonist therapy in sepsis, there is a paucity of data on the use of β1-selective antagonists (B1AA). The purposes of this study were to describe the effects of B1AA on survival in septic animals and to explore for molecular mechanisms of potential treatment benefit. METHODS: C57BL/6 male mice received intraperitoneal injection of lipopolysaccharide. Continuous infusion of a B1AA (esmolol) or an equal volume of saline (control) was initiated at 4 hours after injection. Kaplan-Meier survival analysis at 120 hours was used to explore for mortality differences. A subgroup of animals was sacrificed for microarray expression analysis. Top candidate genes were validated in vitro and in silico. Expression of our candidate genes in a human microarray database (GSE28750) was explored. RESULTS: B1AA infusion resulted in increased survival (p = 0.001) at 120 hours. Mean survival difference was 23.6 hours (p = 0.002). Hazard ratio for mortality with B1AA is 0.43 (95% confidence interval, 0.26-0.72). Immunologic disease (p = 0.0003-0.036) and cell death/survival (p = 0.0001-0.042) were significantly associated with improved survival in septic mice treated with B1AA. Further analysis of the gene structure revealed that eight genes shared common promoter activating sequence for NFKB and/or BRCA1 motifs. Analysis of a human sepsis database identified the up-regulation of CAMP (p = 0.032) and TNFSF10 (p = 0.001) genes in septic patients compared with healthy controls. CONCLUSION: Continuous infusion of a B1AA initiated after septic insult improves survival at 5 days in a murine model. Benefits may be caused by modulation of gene expression in immunologic pathways leading to an increase in CAMP and TNFSF10 expression. This observed effect may be explained by the activation of NFKB and BRCA1 genes involved in immune response and cell repair pathways. Our findings support further investigation of the use of B1AA in the treatment of sepsis.

Original languageEnglish (US)
Pages (from-to)320-328
Number of pages9
JournalJournal of Trauma and Acute Care Surgery
Volume76
Issue number2
DOIs
StatePublished - Feb 1 2014

Keywords

  • A-adrenergic antagonists
  • gene expression
  • mortality
  • mouse
  • sepsis

ASJC Scopus subject areas

  • Surgery
  • Critical Care and Intensive Care Medicine

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