Abstract
Objective and design
To clarify the effects of dietary supplementation of protocatechuic acid (PCA) and in-depth mechanisms on allergic asthma in ovalbumin (OVA)-induced mice.
Materials
Female BALB/c mice were randomly divided into three groups (n = 10 in each group): control group, OVA-induced allergic asthma group, and OVA plus PCA group.
Treatment
Dietary supplementation of PCA was achieved by adding 50 mg/kg PCA to AIN 93G diet for 25 days.
Methods
Peripheral blood cells, pulmonary inflammatory cell infiltration, the levels of IL-4, IL-5, and IL-13 in bronchoalveolar lavage fluid (BALF), the mRNA levels of Th2-related genes in the lungs, and the protein expressions of the IL-4Rα–STAT6 and the Jagged1/Jagged2–Notch1/Notch2 signaling pathways were measured.
Results
Significantly reduced inflammatory cells infiltration and mucosal hypersecretion in the lung tissues, repaired levels of interleukin IL-4, IL-5, and IL-13 in the BALF, and decreased mRNA expression of IL-4, IL-5, and GATA3 were observed in OVA plus PCA group. Moreover, PCA treatment down-regulated the protein levels of IL-4Rα–STAT6 and Jagged1/Jagged2–Notch1/Notch2 signaling pathways.
Conclusions
Dietary supplement of PCA alleviated allergic asthma partly through suppressing the IL-4Rα–STAT6 and Jagged1/Jagged2–Notch1/Notch2 signaling pathways in mice. Our study provided the theoretic basis of PCA used as functional food in preventing allergic asthma.
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Acknowledgements
Qin Li and Yinfan Wu have contributed equally to this work.
Funding
This study was supported by Guangzhou Science and Technology Program [201804020045], the Laboratory Open Found of Sun Yat-sen University [20180278], Shenzhen Science and Technology Innovation Commission [201803073000433], and National Natural Science Foundation of China [81573145 and 81730090].
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Li, Q., Wu, Y., Guo, X. et al. Protocatechuic acid supplement alleviates allergic airway inflammation by inhibiting the IL-4Rα–STAT6 and Jagged 1/Jagged2–Notch1/Notch2 pathways in allergic asthmatic mice. Inflamm. Res. 69, 1027–1037 (2020). https://doi.org/10.1007/s00011-020-01379-1
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DOI: https://doi.org/10.1007/s00011-020-01379-1