Catechin remits the inflammation in allergic asthma mice by suppressing NF-κB-TSLP signal pathway / 中国药理学通报

ABSTRACT

Aim To explore the mechanism of catechin in inhibiting Th2-driven inflammation responses of allergic asthma mice.Methods Female BALB/c mice were chosen to establish an allergic asthma model by sensitized and excited with OVA.Then,the administered group was intervened with catechin by series of dose (75,150,300 mg · kg-1).The proportion of peripheral leukocyte cells was analysed,and pathological changes in lung tissues were observed by HE dyeing.The levels of TSLP,IL-5,IL-13 in lung tissues and OVA specific IgE in mouse serum were measured using ELISA kit.NF-κB p65,IκB protein expression levels in lung tissues were investigated using Western blot,and NF-κB p65 nuclear translocation was detected with immunofluorescent technique.Results Catechin could not only effectively reduce the proportion of peripheral leukocyte cells,but relieve the levels of TSLP,Th2 inflammatory factor IL-5 and IL-13,and the activation of NF-κB signal pathway in lung tissues of allergic asthma mice.Conclusions Catechin can effectively relieve Th2 inflammation in allergic asthma mice induced by allergen OVA.The possible mechanism may be that it could reduce expression of TSLP by inhibiting the NF-κB signal.