期刊
JOURNAL OF ASTHMA AND ALLERGY
卷 14, 期 -, 页码 513-524出版社
DOVE MEDICAL PRESS LTD
DOI: 10.2147/JAA.S307165
关键词
asthma; exosomes; miRNA; miR-21-5p; Smad7; epithelial mesenchymal transition
资金
- National Natural Science Foundation of China [81800029]
- China Medical University [3110118042]
- 345 Talent Project of Shengjing Hospital of China Medical University [M0421]
This study demonstrates that miR-21-5p plays a role in regulating macrophage-derived exosomes on EMT of airway epithelial cells through the TGF beta 1/Smad signaling pathway.
Background: Asthma is usually associated with airway inflammation and airway remodeling. Epithelial mesenchymal transition (EMT) often occurs in airway remodeling. The purpose of this study is to identify the effect of miR-21-5p and Smad7 signaling pathway in macrophage-derived exosomes on EMT of airway epithelial cells. Methods: HE staining and Masson staining were used to verify the successful establishment of the asthma model. The levels of epithelial cell adhesion factor and stromal cell markers were detected by Western blot. The levels of miR-21-5p were detected by qRT-PCR. The expression of miR-21-5p in lung tissue was further verified by fluorescence in situ hybridization (FISH). Exosome morphology was observed by transmission electron microscopy (TEM) and nanoparticle tracking analysis (NTA). Luciferase reporter assay was applied to analyze the interaction of miR-21-5p with Smad7. Results: The expression of miR-21-5p was upregulated in macrophages of rats in vivo with OVA-induced asthma. In vitro cultured alveolar macrophages stimulated by LPS could secrete exosomes with high levels of miR-21-5p. The exosome-derived miR-21-5p promotes EMT in rat tracheal epithelial cells through TGF beta 1/Smad signaling pathway by downregulating Smad7. This process can be blocked by miR-21-5p inhibitor. Conclusion: Rat alveolar macrophages produced high levels of miR-21-5p-containing exosomes, which transported miR-21-5p to tracheal epithelial cells, thus promoting EMT through TGF-beta 1/Smad signaling pathway by targeting Smad7.
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