Abstract
Objective: To investigate the role of miR-205 and GATA3 in Pulmonary Fibrosis (PF).
Methods: Bleomycin (BLM) was used to induce PF in SD rats and in vitro PF model was established by using TGFβ1-induced RLE-6TN cells. miR-205 mimics were used for the overexpression of miR- 205. The expression of miR-205, GATA3, α-SMA, Collagen I, CHOP and GRP78 were measured using RT-qPCR or western blotting. Dual-luciferase reporter assay was used to confirm binding between GATA3 3’-UTR and miR-205.
Results: The expression of miR-205 was significantly down-regulated, while the expression of GATA3 was remarkably up-regulated in the model rats. GATA3 levels were remarkably decreased when miR-205 was overexpressed. When miR-205 was overexpressed, the lung injury by BLM-induced fibrosis was improved. The expression of α-SMA, Collagen I, as well as GRP78 and CHOP, was significantly up-regulated in both in vivo and in vitro PF models, and overexpression of miR-205 remarkably reversed the effects. Dual-luciferase reporter assay showed that miR-205 directly targeted and negatively regulated GATA3.
Conclusion: miR-205 improved pulmonary fibrosis through inhibiting ER-stress by targeting GATA3.
Keywords: miR-205, pulmonary fibrosis, GATA3, CHOP, endoplasmic reticulum stress, alveolar epithelial cells.
Graphical Abstract
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