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- W2012024358 abstract "Epithelial to mesenchymal transition (EMT) of alveolar epithelial cells occurs in lung fibrotic diseases. Tanshinone IIA (Tan IIA) has been reported to exert anti-inflammatory effects in pulmonary fibrosis. Nonetheless, whether Tan IIA affects lung fibrosis-related EMT remains unknown and requires for further investigations.A single intratracheal instillation of saline containing bleomycin (BLM; 5 mg/kg body weight) was performed to induce pulmonary fibrosis in Sprague-Dawley rats. Rats receiving an instillation of equivoluminal normal saline served as controls. Then, these rats were given a daily intraperitoneal administration of Tan IIA (15 mg/kg body weight) for 28 d before sacrifice. In vitro, recombinant transforming growth factor-beta 1 (TGF-β1; 10 ng/mL) was used to treat human alveolar epithelial A549 cells for 48 h. Tan IIA (10 μM) or control DMSO was used to pretreat cells for 2 h before TGF-β1 stimulation. Rat lung tissue samples and A549 cells were then subjected to further assessments.Tan IIA was noted to alleviate BLM-induced pulmonary collagen deposition and macrophage infiltration in rats. Epithelial-cadherin expression was decreased after BLM stimulation, whereas α-smooth muscle actin, fibronectin, and vimentin were increased. These expression alterations were partially reversed by Tan IIA. Moreover, Tan IIA suppressed BLM-induced increases in TGF-β1, phosphorylated Smad-2, and -3 in rats. Additionally, pretreatment of Tan IIA inhibited TGF-β1-triggered EMT, reduced collagen Ⅰ production, and blocked TGF-β signal transduction in A549 cells.Our research suggests that Tan IIA mitigates BLM-induced pulmonary fibrosis and suppresses TGF-β-dependent EMT of lung alveolar epithelial cells." @default.
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- W2012024358 date "2015-07-01" @default.
- W2012024358 modified "2023-10-18" @default.
- W2012024358 title "Tanshinone IIA ameliorates bleomycin-induced pulmonary fibrosis and inhibits transforming growth factor-beta-β–dependent epithelial to mesenchymal transition" @default.
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- W2012024358 doi "https://doi.org/10.1016/j.jss.2015.02.062" @default.
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