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  • Title: Immunoregulatory effects of glycyrrhizic acid exerts anti-asthmatic effects via modulation of Th1/Th2 cytokines and enhancement of CD4(+)CD25(+)Foxp3+ regulatory T cells in ovalbumin-sensitized mice.
    Author: Ma C, Ma Z, Liao XL, Liu J, Fu Q, Ma S.
    Journal: J Ethnopharmacol; 2013 Jul 30; 148(3):755-62. PubMed ID: 23632310.
    Abstract:
    ETHNOPHARMACOLOGICAL RELEVANCE: Glycyrrhizic acid (GA) is the main bioactive ingredient of licorice (Glycyrrhiza glabra), and has been found to be associated with multiple therapeutic properties. AIM OF THE STUDY: In this study, we investigated immunoregulatory effects of glycyrrhizic acid on anti-asthmatic effects and underlying mechanisms. MATERIALS AND METHODS: Asthma model was established by ovalbumin-induced. A total of 60 mice were randomly assigned to six experimental groups: control, model, dexamethasone (2 mg/kg) and GA (10 mg/kg, 20 mg/kg, 40 mg/kg). Airway resistance (Raw) were measured by the forced oscillation technique, histological studies were evaluated by The hematoxylin and eosin (HE) staining, Th1/Th2 and Th17 cytokines were evaluated by enzyme-linked immunosorbent assay (ELISA), and CD4(+)CD25(+)Foxp3(+) regulatory T cells (Tregs) was evaluated by Flow Cytometry (FCM), the forkhead/winged helix transcription factor (Foxp3) was evaluated by western blotting. RESULTS: Our study demonstrated that, compared with model group, GA inhibited OVA-induced increases in Raw and eosinophil count; interleukin (IL)-4, IL-5, IL-13 levels were recovered in bronchoalveolar lavage fluid compared; increased IFN-γ level in bronchoalveolar lavage fluid; histological studies demonstrated that GA substantially inhibited OVA-induced eosinophilia in lung tissue and airway tissue compared with model group. Flow cytometry studies demonstrated that GA substantially enhanced Tregs compared with model group. CONCLUSION: These findings suggest that GA may effectively ameliorate the progression of asthma and could be used as a therapy for patients with allergic asthma.
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