RESUMO
Previous studies have demonstrated that isoflurane inhale anesthesia can effectively attenuate the ischemia-reperfusion-induced pulmonary hypertension (PAH), indicating a protective effect of isoflurane on pulmonary circulation. Pulmonary artery smooth muscle cells (PASMCs) play an important role in pulmonary vascular remodeling and PAH. The abnormality of PASMC structure and function may greatly contribute to the development of PAH. This study aims to explore the effects of isoflurane on hypoxia-induced PASMC pyroptosis and the underlying mechanisms, and to find potential therapeutic target for the treatment of PAH. PASMCs were cultured at 37 ℃, 5%CO
RESUMO
To observe the effects of propofol on the activation of hepatic stellate cell line HSC2-T6 induced by transforming growth factor-beta 1 (TGF-β1) and explore its possible mechanism. The cells were divided into control group, TGF-β1 group, propofol group, TGF-β1 + propofol group, rapamycin group, TGF-β1 + propofol + rapamycin group. Cells were treated with rapamycin (5 μmol/L) for 1 hour, propofol (100 μmol/L) for 1 hour, then TGF-β1 (5 ng/ml) was added to co-culture for 24 hours. Cell proliferation was measured by MTT assay. The concentrations of hyaluronic acid (HA), collagen IV (IV-C) and laminin (LN) in the supernatant of cell culture medium were measured by ELISA. The ultrastructure of cells was observed by transmission electron microscopy. The expressions of alpha-smooth muscle actin (α-SMA), mammalian rapamycin target protein (mTOR), phosphorylated mTOR (p-mTOR) and the autophagy related gene Beclin 1, LC3 and p62 were measured by Western blot. Compared with control group, cell proliferation, the expression of α-SMA, the concentrations of HA, IV-C and LN in culture supernatant, the number of autophages, the expressions of Beclin-1 and LC3-II, the ratio of LC3-II/LC3-I in HSC2-T6 cells were increased significantly, while the expression of p-mTOR, the ratio of p-mTOR/mTOR and the expression of p62 protein were decreased significantly in TGF-β1 group (All P＜0.05). Compared with TGF-β1 group, cell proliferation, the expression of α-SMA, the concentrations of HA, IV-C and LN in culture supernatant, the number of autophages, the expressions of Beclin-1 and LC3-II, the ratio of LC3-II/LC3-I in HSC2-T6 cells in TGF-β1 group were decreased significantly, and the expression of p-mTOR, the ratio of p-mTOR/mTOR and expression of p62 protein were increased significantly in TGF-β1 + propofol group (All P＜0.05). Propofol inhibits the activation of hepatic stellate cells induced by TGF-beta 1, and its mechanism involves the mTOR-autophagy pathway.