甘草提取物对TGF-β1诱导心肌成纤维细胞纤维化的影响

目的：考察甘草提取物对TGF-β1诱导心肌成纤维细胞（CFs）纤维化干预作用。方法：10 ng/mL TGF-β1诱导CFs建立心肌纤维化细胞模型。用甘草提取物处理纤维化细胞，MTT法检测不同浓度甘草提取物对细胞增殖的影响；CCK-8检测TGF-β1诱导后，甘草提取物对CFs细胞增殖的影响；免疫荧光检测平滑肌肌动蛋白（α-SMA）的表达；Western blot检测TGF-β1/Smad信号通路相关蛋白及p-Smad2、p-Smad3蛋白表达水平；RT-PCR检测Smad2、Smad3、Smad4 mRNA表达水平。结果：各浓度甘草提取物处理细胞后细胞活性与对照组比较，差异有统计学意义（P<0.05）。甘草提取物各浓度组细胞增殖率显著低于TGF-β1组（P<0.05）；100 μg/mL甘草提取物对α-SMA、TGF-β1/Smad信号通路相关蛋白表达水平显著低于TGF-β1组（P<0.05）。 结论：甘草提取物对TGF-β1诱导的心肌纤维细胞纤维化的发生发展具有一定改善作用，其作用机制与抑制TGF-β1/Smad信号通路有关。

Evolution of Interfacial Microstructure of Ni-Co Base Superalloy During Plastic Deformation Bonding and Its Bonding Mechanism

AIM: To investigate the effect of liquorice extract on TGF-β1-induced myocardial fibroblast (CFs) fibrosis. METHODS: 10 ng/mL TGF-β1 induced CFs to establish myocardial fibrosis cell model. Fibrotic cells were treated with liquorice extract and the cell activity was detected by MTT assay. CCK-8 was used to detect the effect of liquorice extract on CFs proliferation. The expression of smooth muscle actin (α-SMA) was detected by immunofluorescence. Western blot was used to detect TGF-β1/Smad signaling pathway related proteins and p-Smad2, p-Smad3 expression levels. The mRNA expression levels of Smad2, Smad3 and Smad4 were detected by RT-PCR. RESULTS: Compared with the control group, there were statistically significant differences in cell activity (P<0.05). The cell proliferation rate of glycyrrhiza uralensis extract groups was significantly lower than that of TGF-β1 group (P<0.05). The expression levels of α-SMA and TGF-β1/Smad signaling pathway related proteins in 100 μg/mL liquorice extract were significantly lower than those in TGF-β1 group (P<0.05). CONCLUSION: Glycyrrhiza extract can improve the occurrence and development of TGF-β1-induced myocardial fibrosis, and its mechanism maybe related to the inhibition of TGF-β1/Smad signaling pathway.