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MicroRNA-30a Targets ATG5 and Attenuates Airway Fibrosis in Asthma by Suppressing Autophagy

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Abstract

Asthma is the most common chronic disease of childhood, chronic airway inflammation; bronchial tissue fibrosis, is a pathological feature common to children asthma, and an emerging data has indicted that autophagy plays critical roles in airway inflammation and fibrosis-mediated airway remodeling. The aim of this study was to examine whether the antifibrotic effect of epithelial microRNAs (miRNAs) relies on regulating autophagy-mediated airway remodeling and to identify the factors involved and the underlying mechanisms. Our results showed miR-30a were downregulated in children with asthma and ovalbumin (OVA) mouse model in parallel with the upregulation of autophagy-related proteins; moreover, we observed miR-30a inhibited the autophagy by downregulated autophagy-related 5 (ATG5). Then, we observed that overexpression of miR-30a suppressed the fibrogenesis and autophagic flux which was stimulated by interleukin-33 (IL-33) in bronchial epithelial cells. In vivo experiments showed that miR-30a overexpression decreased airway remodeling by decreased autophagy. This study uncovered a previously unrecognized antifibrotic role of miR-30a in asthma, in IL-33-induced lung epithelial cells in vitro, and in a murine model of OVA-induced airway inflammation in vivo and explored the underlying mechanisms.

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Correspondence to Yun long Chen or Fuzhen Pang.

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All mouse experiments were approved by research committee of Zhejiang University. This study was approved by the Hangzhou Children’s Hospital and written informed consent was obtained from all patients.

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Li, B.B., Chen, Y.l. & Pang, F. MicroRNA-30a Targets ATG5 and Attenuates Airway Fibrosis in Asthma by Suppressing Autophagy. Inflammation 43, 44–53 (2020). https://doi.org/10.1007/s10753-019-01076-0

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