Neutralization of Osteopontin Ameliorates Acute Lung Injury Induced by Intestinal Ischemia-Reperfusion

Shock. 2016 Oct;46(4):431-8. doi: 10.1097/SHK.0000000000000611.

Abstract

Intestinal ischemia-reperfusion (I/R) is associated with acute respiratory distress syndrome. Osteopontin (OPN), a glycoprotein secreted from immune-reactive cells, plays a deleterious role in various inflammatory diseases. Considering OPN as a pro-inflammatory molecule, we hypothesize that the treatment with its neutralizing antibody (anti-OPN Ab) protects mice against intestinal I/R-induced acute lung injury (ALI). Intestinal I/R was induced in mice by superior mesenteric artery occlusion with a vascular clip. After 45 min of occlusion, the clip was removed and anti-OPN Ab (25 μg/mouse) or normal IgG isotype control (25 μg/mouse) was immediately administrated intravenously. Blood, small intestine, and lung tissues were collected at 4 h after reperfusion for various analyses. After intestinal I/R, mRNA and protein levels of OPN were significantly induced in the small intestine, lungs, and blood relative to sham-operated animals. Compared with the IgG control group, treatment of anti-OPN Ab significantly reduced plasma levels of pro-inflammatory cytokine and chemokine (IL-6 and MIP-2) and organ injury markers (AST, ALT, and LDH). The histological architecture of the gut and lung tissues in anti-OPN Ab-treated intestinal I/R-induced mice showed significant improvement versus the IgG control mice. The lung inflammation measured by the levels of IL-6, IL-1β, and MIP-2 was also significantly downregulated in the anti-OPN Ab-treated mice as compared with the IgG control mice. Besides, the lung MPO and neutrophil infiltration in anti-OPN Ab-treated mice showed significant reduction as compared with the IgG control animals. In conclusion, we have demonstrated beneficial outcomes of anti-OPN Ab treatment in protecting against ALI, implicating a novel therapeutic potential in intestinal I/R.

MeSH terms

  • Acute Lung Injury / etiology
  • Acute Lung Injury / metabolism*
  • Animals
  • Chemokine CXCL2 / metabolism
  • Interleukin-6 / metabolism
  • Intestinal Mucosa / metabolism
  • Intestine, Small / metabolism
  • Intestines / pathology
  • Lung / metabolism
  • Lung / pathology
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Osteopontin / genetics
  • Osteopontin / metabolism*
  • Reperfusion Injury / metabolism*
  • Reperfusion Injury / pathology
  • Reverse Transcriptase Polymerase Chain Reaction

Substances

  • Chemokine CXCL2
  • Interleukin-6
  • Osteopontin