Objective To investigate the influence of salvianolic acid B on the expressions of TGF-β1/Smad signaling pathway related proteins in human lung fibroblasts,and to explore the mechanism of the inhibitory effect of Sal B on TGF-β1-induced lung fibroblast activation.Methods The human embryonic lung fibroblasts (MRC-5) were cultured in vitro and randomly divided into control group ( the cells were cultured with DMEM without TGF-β1 or Sal B),Sal B group (the cells were cultured with 10μmol·L-1 Sal B),TGF-β1 group (the cells were cultured with 10μg·L-1 TGF-β1),and TGF-β1 (10μg·L-1 )+ Sal B (10μmol·L-1 )group.The protein levels of p-Smad2,p-Smad3,TβRⅠ,and Smad7 in the fibroblasts in various groups were detected by Western blotting method.Results Compared with control group,the expression levels of p-Smad2,p-Smad3,and TβRⅠproteins in TGF-β1 group were significantly increased (P<0.05),and the expression level of Smad7 protein was decreased (P<0.05).Compared with control group,the expression levels of p-Smad2,p-Smad3,TβRⅠ,and Smad7 proteins in lung fibroblasts in Sal B group had no significant change (P>0.05).Compared with TGF-β1 group,the expression levels of p-Smad2,p-Smad3,and TβRⅠ in TGF-β1+ Sal B group were descended (P<0.05),and the expression level of Smad7 was increased (P<0.05).Conclusion Sal B could suppress the TGF-β/Smad signaling pathway in lung fibroblasts and to inhibit the TGF-β1-induced lung fibroblast activation.%目的：观察丹酚酸B （Sal B）对人肺成纤维细胞转化生长因子β1（TGF-β1）/Smad信号通路相关蛋白表达的影响，探讨其抑制TGF-β1活化肺成纤维细胞作用的信号机制。方法：体外培养人胚肺成纤维细胞MRC-5，随机分为对照组（未加入TGF-β1或 Sal B）、Sal B （10μmol·L-1）组、TGF-β1（10μg·L-1）组和TGF-β1（10μg·L-1）＋ Sal B （10μmol·L-1）组。Western blotting 法检测各组细胞内 p-Smad2、p-Smad3、TGF-βⅠ型受体（TβRⅠ）和 Smad7蛋白表达。结果：与对照组比较， TGF-β1组细胞内 p-Smad2、p-Smad3和TβRⅠ蛋白表达水平均明显升高（P＜0.05），Smad7蛋白表达水平明显下降（P＜0.05）；与对照组比较，Sal B组细胞内 p-Smad2、p-Smad3、TβRⅠ和 Smad7蛋白表达水平无明显变化（P＞0.05）；与 TGF-β1组比较， TGF-β1＋ Sal B组细胞内 p-Smad2、p-Smad3和TβRⅠ蛋白表达水平均下降（P＜0.05）， Smad7蛋白表达水平升高（P＜0.05）。结论：Sal B能够通过抑制肺成纤维细胞TGF-β1/Smad信号通路，从而发挥其抑制TGF-β1活化肺成纤维细胞的作用。
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