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Sevoflurane attenuates pulmonary inflammation and ventilator-induced lung injury by upregulation of HO-1 mRNA expression in mice

Authors Xiong XQ, Lin LN, Wang LR, Jin LD

Received 14 December 2012

Accepted for publication 26 January 2013

Published 13 March 2013 Volume 2013:8(1) Pages 1075—1081

DOI https://dx.doi.org/10.2147/IJN.S41625

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Xiang-qing Xiong, Li-na Lin, Liang-rong Wang, Li-da Jin

Department of Anesthesiology, the First Affiliated Hospital of Wenzhou Medical College, Wenzhou, People's Republic of China

Background: Mechanical ventilation has been documented to paradoxically cause lung injury. As a commonly used volatile anesthetic, sevoflurane has been proven to possess antiinflammatory and antioxidative properties. This study aims to investigate the protective effects of sevoflurane on inflammation and ventilator-induced lung injury during mechanical ventilation in healthy mice.
Methods: The adult healthy mice were divided into four groups, each consisting of ten subjects: mice in group Con-LVT and group Sev-LVT were ventilated with tidal volumes of 8 mL/kg for 4 hours, while those in group Con-HVT and group Sev-HVT were ventilated with tidal volumes of 16 mL/kg instead. Control mice (group Con-LVT and Con-HVT) were subjected to fresh air, while sevoflurane-treated mice (groups Sev-LVT and Sev-HVT) were subjected to air mixed with 1 vol% sevoflurane. After 4 hours of ventilation, the bronchoalveolar lavage (BAL) fluid was collected and analyzed for the levels of tumor necrosis factor (TNF)-α, interleukin (IL)-1β, IL-6, and IL-10. Lung homogenates were harvested to detect the expression of nuclear factor-kppa B (NF-кB) and heme oxygenase (HO)-1 mRNA by reverse transcription-polymerase chain reaction method. Lung damage was evaluated using the modified Ventilator-Induced Lung Injury histological scoring system.
Results: Compared to group Con-LVT, the levels of TNF-α, IL-1β, IL-6, and IL-10 in BAL fluid, mRNA expressions of NF-кB and HO-1 in lung tissue, and lung injury scores were significantly increased in group Con-HVT; compared to group Con-HVT, group Sev-HVT BAL samples showed decreased levels of TNF-α, IL-1β, and IL-6; they also showed increased levels of IL-10, the downregulation of NF-кB mRNA, and HO-1 mRNA upregulation; the lung injury scores were significantly lower in group Sev-HVT than group Con-HVT.
Conclusion: Mechanical ventilation with high tidal volume might lead to lung injury, which could be significantly, but not completely, attenuated by sevoflurane inhalation by inhibiting the NF-кB-mediated proinflammatory cytokine generation and upregulating HO-1 expression.

Keywords:
mechanical ventilation, sevoflurane, inflammation, lung injury

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