Abstract: Objective:To investigate the inhibitory effect of resveratrol on the pulmonary inflammation in the mice with neutrophilic asthma, and to elucidate its mechanism. Methods:A total of 18 female C57BL/6J mice were selected.The mouse models of neutrophilic asthma were established by sensitization with lipopolysaccharide (LPS) and ovalbumin (OVA). The model mice were randomly divided into model group (LPS + OVA group), resveratrol group(Res group, intragastric administration of 30 mg·kg^-1 resveratrol at 2 h before challenge) and N-acetylcysteine group (NAC group, intragastric administration of 3 mmol·kg^-1 N-acetylcysteine at 2 h before challenge). Other 6 age-matched female C57BL/6J mice were choosen as normal control group (PBS group). The behavioral changes of mice in various groups were observed during the atomization with methacholine; the airway hyperresponsiveness (AHR) of mice was analyzed with a lung function instrument, and the total number of cells and inflammatory cells in the bronchoalveolar lavage fluid (BALF) were observed with light microscope; the pathological changes of lung tissue were observe by HE staining; the levels of interleukin-17(IL-17) in the supernatant of BALF of the mice in various groups were detected by enzyme-linked immunosorbent assay (ELISA); the level of reactive oxygen species (ROS) in lung tissue was analyzed by specific fluorescent probe DCF-DA staining; the level of malondialdehyde (MDA) in lung homogenate was measured by MDA kit. Results:Compared with PBS group, the Penh value, total number of cells, inflammatory cells, airway inflammation and scores of the mice in LPS+OVA group were significantly increased (P<0.05 or P<0.01); the IL-17 level in BALF supernatant was significantly increased (P<0.01); the ROS fluorescence intensity in lung tissue was significantly increased, and the MDA level in lung homogenates was significantly increased (P<0.01). Compared with LPS + OVA group, the Penh value, total number of cells, inflammatory cells, airway inflammation and scores in Res group and NAC group were significantly decreased (P<0.05 or P<0.01); the IL-17 levels in BALF supernatant were significantly decreased (P<0.05 or P<0.01); the ROS fluorescence intensities in lung tissue were decreased, and the MDA levels in lung homogenates were significantly decreased (P<0.01). Conclusion:Resveratrol can effectively inhibit the inflammatory response of lung tissue in the mice with neutrophilic asthma, and its mechanism may be related to inhibiting the oxidative stress reaction.

Key words: neutrophilic asthma, resveratrol, inflammation, oxidative stress