Correlation between oxidative stress and NF-κB signaling pathway in the obesity-asthma mice

In this study, a mice model of obesity-asthma was established. We investigated the correlation between oxidative stress and NF-κB signaling pathway in the lung tissues, together with the effects of acetylcysteine. The animals were fed on a high-fat diet, and then ovalbumin (OVA) sensitization was utilized to establish the obesity-asthma model. N-acetylcysteine was used to treat asthma, animals treated with budesonide served as control. The malondialdehyde (MDA) in the lung tissues was determined, together with the activity of glutathione (GSH). EMAS assay was utilized to measure the nuclear factor-κB-P65 (NF-κB-P65) in lung tissues. Western blot analysis was performed to determine the expression of inhibitor kappa B-α (IκB-α) and inhibitor kappa B kinase-β (IKK-β). The MDA in the asthma groups showed significantly elevation (P < 0.01), and the GSH showed significant decrease (P < 0.01), especially in the obesity-asthma group. The efficiency of N-acetylcysteine was superior to that of the budesonide in the decline of MDA and elevation of GSH (P < 0.01). In both asthma groups, the expression of IKK-β and transcription of NF-κB-P65 in the lung tissues showed significant elevation (P < 0.01), and IκB-α showed significant decline (P < 0.01), especially in the obesity-asthma group. There was decline of IKK-β and NF-κB-P65 and elevation of IκB-α in the N-acetylcysteine group, which was even significantly in the Budesonide group (P < 0.01). There was a positive correlation between MDA and NF-κB activation in the lung tissues in all the asthma groups and treatment groups (P < 0.05). Obesity-asthma mice showed higher oxidative stress and activation of NF-κB compared with that of the asthma mice. There was a positive correlation between MDA and NF-κB activation in the lung tissues in the asthma groups. N-acetylcysteine was more effective in reducing the oxidative stress compared to the budesonide.