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The Effects of Ethyl Pyruvate on Lipopolysaccharide-induced Acute Lung Injury  

Lee, Seung Hyeun (Department of Internal Medicine, College of Medicine, Korea University)
Yoon, Dae Wui (Institute of Human Genomic Study, Ansan Hospital, Korea University Medical Center)
Jung, Jin Yong (Department of Internal Medicine, College of Medicine, Korea University)
Lee, Kyung Joo (Department of Internal Medicine, College of Medicine, Korea University)
Kim, Se Joong (Department of Internal Medicine, College of Medicine, Korea University)
Lee, Eun Joo (Department of Internal Medicine, College of Medicine, Korea University)
Kang, Eun Hae (Department of Internal Medicine, College of Medicine, Korea University)
Jung, Ki Hwan (Department of Internal Medicine, College of Medicine, Korea University)
Lee, Sung Yong (Department of Internal Medicine, College of Medicine, Korea University)
Lee, Sang Yeub (Department of Internal Medicine, College of Medicine, Korea University)
Kim, Je Hyeong (Department of Internal Medicine, College of Medicine, Korea University)
Shin, Chol (Department of Internal Medicine, College of Medicine, Korea University)
Shim, Jae Jeong (Department of Internal Medicine, College of Medicine, Korea University)
In, Kwang Ho (Department of Internal Medicine, College of Medicine, Korea University)
Kang, Kyung Ho (Department of Internal Medicine, College of Medicine, Korea University)
Yoo, Se Hwa (Department of Internal Medicine, College of Medicine, Korea University)
Publication Information
Tuberculosis and Respiratory Diseases / v.61, no.4, 2006 , pp. 374-383 More about this Journal
Abstract
Background: Ethyl pyruvate (EP) is a derivative of pyruvate that has recently been identified by both various in vitro and in vivo studies to have antioxidant and anti-inflammatory effects. The aim of this study was to determine the effect of EP on lipopolysaccharide (LPS)-induced acute lung injury (ALI). Methods: 5 weeks old, male BALB/c mice were used. ALI was induced by an intratracheal instillation of LPS 0.5mg/Kg/$50{\mu}L$ of saline. The mice were divided into the control, LPS, EP+LPS, and LPS+EP groups. In the control group, balanced salt solution was injected intraperitoneally 30 minutes before or 9 hours after the intratracheal instillation of saline. In the LPS group, a balanced salt solution was also injected intraperitoneally 30 minutes before or 9 hours after instillation the LPS. In the EP+LPS group, 40mg/Kg of EP was injected 30 minutes before LPS instillation. In the LPS+EP group, 40mg/Kg of EP was injected 9 hours after LPS instillation. The TNF-$\alpha$ and IL-6 concentrations in the bronchoalveolar lavage fluid (BALF), and that of NF-$\kappa$B in the lung tissue were measured in the control, LPS and EP+LPS groups at 6 hours after instillation of saline or LPS, and the ALI score and myeloperoxidase (MPO) activity were measured in all four groups 24 and 48 hours after LPS instillation, respectively. Results: The TNF-$\alpha$ and IL-6 concentrations were significantly lower in the EP+LPS group than in the LPS group (p<0.05). The changes in the concentration of these inflammatory cytokines were strongly correlated with that of NF-$\kappa$B (p<0.01). The ALI scores were significantly lower in the EP+LPS and LPS+EP groups compared with the LPS group (p<0.05). In the EP+LPS group, the MPO activity was significantly lower than the LPS group (p=0.019). Conclusion: EP, either administered before or after LPS instillation, has protective effects against the pathogenesis of LPS-induced ALI. EP has potential theurapeutic effects on LPS-induced ALI.
Keywords
Acute lung injury; Lipopolysaccharide; Ethyl pyruvate;
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