Protective effects of sphingosine 1-phosphate in murine endotoxin-induced inflammatory lung injury

Xinqi Peng, Paul M. Hassoun, Saad Sammani, Bryan J. McVerry, Melissa J. Burne, Hamid Rabb, David Pearse, Rubin M. Tuder, Joe G.N. Garcia

Research output: Contribution to journalArticle

Abstract

Our prior in vitro studies indicate that sphingosine 1-phosphate (S1P), a phospholipid angiogenic factor, produces endothelial cell barrier enhancement through ligation of endothelial differentiation gene family receptors. We hypothesized that S1P may reduce the vascular leak associated with acute lung injury and found that S1P infusion produced a rapid and significant reduction in lung weight gain (more than 50%) in the isolated perfused murine lung. The effect of S1P was next assessed in a murine model of LPS-mediated microvascular permeability and inflammation with marked increases in parameters of lung injury at both 6 and 24 hours after intratracheal LPS. Each parameter assessed was significantly reduced by intravenous S1P (1 μM final) and in selected experiments by the S1P analogue FTY720 (0.1 mg/kg, intraperitoneally) delivered 1 hour after LPS. S1P produced an approximately 40-50% reduction in LPS-mediated extravasation of Evans blue dye albumin, bronchoalveolar lavage protein content, and lung tissue myeloperoxidase activity (reflecting phagocyte infiltration). Consistent with systemic barrier enhancement, S1P significantly decreased Evans blue dye albumin extravasation and myeloperoxidase content in renal tissues of LPS-treated mice. These studies indicate that S1P significantly decreases pulmonary/renal vascular leakage and inflammation in a murine model of LPS-mediated acute lung injury and may represent a novel therapeutic strategy for vascular barrier dysfunction.

Original languageEnglish (US)
Pages (from-to)1245-1251
Number of pages7
JournalAmerican journal of respiratory and critical care medicine
Volume169
Issue number11
StatePublished - Jun 1 2004
Externally publishedYes

Keywords

  • Acute respiratory distress syndrome
  • Inflammation
  • Permeability
  • Sphingolipids

ASJC Scopus subject areas

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

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