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TGF-β3 Promotes MUC5AC Hyper-Expression by Modulating Autophagy Pathway in Airway Epithelium.

EBioMedicine (2018-07-13)
Yun Zhang, Hongmei Tang, Xiefang Yuan, Qin Ran, Xiaoyun Wang, Qi Song, Lei Zhang, Yuhuan Qiu, Xing Wang
ABSTRACT

Mucus secretion accumulation in the airways may act as a contributing factor for the development of airflow limitation in severe fetal asthma patients. Accumulated evidences showed that transforming growth factor beta (TGF-β) plays a regulatory role in airway remodeling including mucus hyper-secretion in asthma. However, the detailed molecular mechanisms of TGF-β3 induced MUC5AC hyper-expression in airway epithelium remains unclear. Here, we demonstrated the pivotal roles of autophagy in regulation of MUC5AC hyper-production induced by TGF-β3 in airway epithelium. Our experimental data showed that inhibiting autophagy pathway in repeated ovalbumin (OVA) exposed mice exhibited decreased airway hyper-response and airway inflammation, diminishing the expression of Muc5ac and TGF-β3. Furthermore, our studies demonstrated that autophagy was induced upon exposure to TGF-β3 and then mediated MUC5AC hyper-expression by activating the activator protein-1 (AP-1) in human bronchial epithelial cells. Finally, Smad2/3 pathway was involved in TGF-β3-induced MUC5AC hyper-expressions by promoting autophagy. These data indicated that autophagy was required for TGF-β3 induced airway mucous hyper-production, and that inhibition of autophagy exerted therapeutic benefits for TGF-β3 induced airway mucus secretion.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Anti-ATG5 (N-terminal) antibody produced in rabbit, affinity isolated antibody, PBS solution
Sigma-Aldrich
Anti-LC3B antibody produced in rabbit, ~1 mg/mL, affinity isolated antibody, buffered aqueous solution