The effects of exogenous surfactant administration on ventilation-induced inflammation in mouse models of lung injury

BMC Pulmonary Medicine

James F Lewis¹  Ruud AW Veldhuizen¹  Li-Juan Yao¹  Lynda A McCaig¹  Josh Qua Hiansen²  Valeria Puntorieri² 

[1] Lawson Health Research Institute, London, ON, Canada;Department of Physiology & Pharmacology, Western University, London, Ontario, Canada

关键词: Systemic inflammation;    Exogenous surfactant;    Mechanical ventilation;    Acute lung injury;   

Others  :  1109619
DOI  :  10.1186/1471-2466-13-67

 received in 2013-01-29, accepted in 2013-11-14,  发布年份 2013

【 摘 要 】

Background

Mechanical ventilation (MV) is an essential supportive therapy for acute lung injury (ALI); however it can also contribute to systemic inflammation. Since pulmonary surfactant has anti-inflammatory properties, the aim of the study was to investigate the effect of exogenous surfactant administration on ventilation-induced systemic inflammation.

Methods

Mice were randomized to receive an intra-tracheal instillation of a natural exogenous surfactant preparation (bLES, 50 mg/kg) or no treatment as a control. MV was then performed using the isolated and perfused mouse lung (IPML) set up. This model allowed for lung perfusion during MV. In experiment 1, mice were exposed to mechanical ventilation only (tidal volume =20 mL/kg, 2 hours). In experiment 2, hydrochloric acid or air was instilled intra-tracheally four hours before applying exogenous surfactant and ventilation (tidal volume =5 mL/kg, 2 hours).

Results

For both experiments, exogenous surfactant administration led to increased total and functional surfactant in the treated groups compared to the controls. Exogenous surfactant administration in mice exposed to MV only did not affect peak inspiratory pressure (PIP), lung IL-6 levels and the development of perfusate inflammation compared to non-treated controls. Acid injured mice exposed to conventional MV showed elevated PIP, lung IL-6 and protein levels and greater perfusate inflammation compared to air instilled controls. Instillation of exogenous surfactant did not influence the development of lung injury. Moreover, exogenous surfactant was not effective in reducing the concentration of inflammatory cytokines in the perfusate.

Conclusions

The data indicates that exogenous surfactant did not mitigate ventilation-induced systemic inflammation in our models. Future studies will focus on altering surfactant composition to improve its immuno-modulating activity.

【 授权许可】

   
2013 Puntorieri et al.; licensee BioMed Central Ltd.

【 图 表 】

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