Mastic Alleviates Allergic Inflammation in Asthmatic Model Mice by Inhibiting Recruitment of Eosinophils

The pathogenesis of allergic asthma is characterized by airway inflammation, eosinophilia, and airway hyperresponsiveness. In the present study, we investigated the anti-inflammatory effects of mastic, obtained from the stem and the leaves of Pistacia lentiscus trees, on allergic asthma. In an ovalbumin-induced mouse asthma model, mastic significantly inhibited eosinophilia, while reducing airway hyperresponsiveness and suppressing the production of inflammatory cytokines (IL-5 and IL-13) as well as chemokines (eotaxin, eotaxin2, and regulated upon activation, normal T-cell expressed and secreted) in bronchoalveolar lavage fluid. Moreover, mastic potently inhibited eotaxin-induced eosinophil chemotaxis in vitro without influencing eotaxin receptor, chemokine receptor 3, expression. These results suggest that mastic may contribute to the treatment of inflammatory diseases.