Hyperoside Regulates the Level of Thymic Stromal Lymphopoietin through Intracellular Calcium Signalling

Hyperoside (HYP) is the principle active component of Crataegus pinnatifida. Thymic stromal lymphopoietin (TSLP) plays a vital role in the pathogenesis of allergic reactions. Here, we investigated how HYP regulates the levels of TSLP in a human mast cell line, HMC‐1 cells. We analyzed the levels of TSLP by treatment with HYP in phorbol myristate acetate plus calcium ionophore A23187‐stimulated HMC‐1 cells with ELISA and a polymerase chain reaction analysis. We also analyzed the pathway that HYP regulates TSLP by measuring the level of fluorescent intracellular calcium and using a Western blot analysis. HYP decreased the level of intracellular calcium in stimulated HMC‐1 cells. It also significantly decreased the production and mRNA expression of TSLP in stimulated HMC‐1 cells. It significantly decreased the levels of receptor‐interacting protein 2 and active caspase‐1 in stimulated HMC‐1 cells. HYP significantly decreased the translocation of NF‐κB into the nucleus and degradation of IκBα in the cytoplasm in stimulated HMC‐1 cells. Furthermore, it significantly decreased the production and mRNA expression of interleukin‐1β and interleukin‐6 in stimulated HMC‐1 cells. Taken together, our findings establish HYP as a potential agent for the treatment of allergic reactions. Copyright © 2013 John Wiley & Sons, Ltd.