Effects of catalpol on bronchial asthma and its relationship with cytokines

Abstract An animal (BALB/c mice) model of catalpol associated with bronchial asthma in vivo was established, and the effects of catalpol and its relationship with cytokines were investigated. A total of 30 adult BALB/c mice were randomly divided into a positive control group, a model group, and a catalpol group, with 10 mice in each group. The lung function of mice, the cell count, and the cytokine concentrations in bronchoalveolar lavage fluid (BALF) were detected. The levels of cytokines [interleukin 4 (IL‐4), interleukin 5 (IL5), and interferon gamma (IFN‐γ)] in BALF were measured with enzyme‐linked immunosorbent assay methods. The total number of cells in the BALF of the group treated with catalpol was significantly lower than the model group. After treatment with catalpol, the eosinophils and neutrophils of the mice were remarkably reduced compared with the model group. The malondialdehyde content in the lung tissue homogenate of the mice was also decreased in the catalpol group. The cytokines IL‐5 and IL‐4 exhibited a similar tendency: the concentrations of IL‐4 and IL‐5 for the catalpol group were dramatically decreased compared with the model group. However, the IFN‐γ concentration for the catalpol group was higher than the model group. The results indicated that IL‐5 may involve in the pathologic process of asthma‐like IL‐4, and an inflammatory reaction may still exist in the airway during the remission stage of asthma. The imbalances of the cytokine network might be an important molecular basis in the asthma pathogenesis. It is suggested that catalpol may be a potential drug for the clinical treatment of asthma.