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KMID : 0383820110710020097
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Tuberculosis and Respiratory Diseases
2011 Volume.71 No. 2 p.97 ~ p.105
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A Study on the Mechanism of Immunomodulating Effects of Moxifloxacin in Oleic Acid-Induced Acute Lung Injury
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Lee Young-Man
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Abstract
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Background: It was hypothesized that the immunomodulating effects of moxifloxacin contribute to ameliorate oleic acid (OA)-induced acute lung injury (ALI) by suppression of cytosolic phospholipase A2 (cPLA2). This was based on observations from experiments on rats associated with neutrophilic respiratory burst, cPLA2 activity, and expressions of cPLA2, TNFα, and COX-II in the lung.
Materials and Methods : ALI was induced by intravenous injection of OA in male Sprague-Dawley rats. Five hours after OA injection, protein content in bronchoalveolar lavage (BAL), lung myeloperoxidase (MPO) activity, and numbers of BAL neutrophils were measured. As an index of oxidative stress-induced lung injury, the content of malondialdehyde (MDA) in lung tissues was also determined. Lung histology, immunohistochemistry and determination of activity of cPLA2 in lung tissues were carried out. In addition, Western blotting of TNFα and COX-II in lung tissues was performed.
Results: The accumulation of neutrophils in the lungs was observed after OA injection. BAL protein was increased along with neutrophilic infiltration and migration by OA. Moxifloxacin decreased all of these parameters of ALI and ameliorated ALI histologically. The increased malondialdehyde (MDA) in the lung by OA was also decreased by moxifloxacin. Moxifloxacin not only suppressed cPLA2 expression in the lungs and neutrophils but also decreased cPLA2 activity in lung tissues of rats given OA. The enhanced expressions of TNFα and COX-2 in the lung tissues of rats given OA were also suppressed by moxifloxacin.
Conclusion: Moxifloxacin inhibited cPLA2 and down-regulated TNFα and COX-2 in the lungs of rats given OA, which resulted in the attenuation of inflammatory lung injury.
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KEYWORD
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Moxifloxacin, Oleic Acid, Neutrophils, Acute Lung Injury
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