期刊
AMERICAN JOURNAL OF RESPIRATORY CELL AND MOLECULAR BIOLOGY
卷 50, 期 1, 页码 193-200出版社
AMER THORACIC SOC
DOI: 10.1165/rcmb.2013-0148OC
关键词
angiopoietin-2; indirect acute lung injury; neutrophil; short interference (si)-RNA; endothelial cells
资金
- Rhode Island Foundation
- Surgical Infection Society
- National Institutes of Health [P20-GM103652-01A1, 8257, R01-GM107149-01]
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM107149, P20GM103652] Funding Source: NIH RePORTER
Unresolved inflammation in the lung is thought to elicit loss of endothelial cell (EC) barrier integrity and impaired lung function. We have shown, in a mouse model of shock/sepsis, that neutrophil interactions with resident pulmonary cells appear central to the pathogenesis of indirect acute lung injury (iALI). Normally, EC growth factors angiopoietin (Ang)-1 and Ang-2 maintain vascular homeostasis through tightly regulated interaction with the kinase receptor Tie2 expressed on ECs. Although Ang-1/Tie2 has been shown to promote vessel integrity, stimulating downstream prosurvival/antiinflammatory signaling, Ang-2, released from activated ECs, is reported to promote vessel destabilization. This mechanism of regulation, together with recent clinical findings that plasma Ang-2 levels are significantly elevated in patients who develop acute respiratory distress syndrome, has focused our investigation on the contribution of Ang-2 to the development of iALI. A murine model of hemorrhagic shock-induced priming for the development of iALI after subsequent septic challenge was used in this study. Our findings show that 1) Ang-2 is elevated in our experimental model for iALI, 2) direct EC/neutrophil interactions contribute significantly to ECAng-2 release, and 3) suppression of Ang-2 significantly decreases inflammatory lung injury, neutrophil influx, and lung and plasma IL-6 and TNF-alpha. These findings support our hypothesis and suggest that Ang-2 plays a role in the loss of pulmonary EC barrier function in the development of iALI in mice resultant from the sequential insults of hemorrhagic shock and sepsis and that this is mediated by EC interaction with activated neutrophils.
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