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Fyn-STAT5 is considered to be the frontier signaling pathway of IgE-mediated allergic reactions related to mast cell activation, but research on allergic rhinitis (AR) has been rarely reported. Xingbi gel nasal drops (XGND) are a compound preparation of traditional Chinese medicine, which has the exact therapeutic efficacy on AR. The current study aimed to observe the effects of XGND on Fyn-STAT5 pathway in AR guinea pig nasal mucosal fibroblasts  in vitro  and further illuminate the possible therapeutic mechanism of XGND on AR. The isolated and cultured nasal mucosa fibroblasts from AR guinea pigs were identified by immunocytochemical staining. Real-time PCR and western blot were performed to detect the mRNA and protein levels of the Fyn-STAT5 pathway and related cytokines in AR guinea pig nasal mucosal fibroblasts. The results indicated that XGND may interfere with the Fyn-STAT5 pathway by reducing the expression of Fyn and SCF and upregulating STAT5 and IL-10, thereby inhibiting proliferation and degranulation of mast cells, correcting Th1/Th2 immune imbalance, and then alleviating the immune response of AR fibroblasts. Our study revealed the possible regulatory mechanism of XGND in AR and laid an experimental foundation for improving the clinical efficacy of AR and enriching the clinical medication for AR.

Effect of Xingbi Gel Nasal Drops on Fyn-STAT5 Pathway in Nasal Mucosa Fibroblasts of Guinea Pigs with Allergic Rhinitis