全反式维甲酸对人胚肺成纤维细胞增殖及α-SMA表达的影响

目的: 研究全反式维甲酸(ATRA)对人胚肺成纤维细胞(HFL-I)增殖与分化的影响。方法: 体外培养HFL-I, MTT法检测不同浓度ATRA(0.1 μmol/L、1 μmol/L、10 μmol/L)作用3 d对HFL-I增殖能力的影响。5 μg/L 转化生长因子β₁(TGF-β₁)刺激0 h、6 h、12 h、24 h、48 h、72 h后,RT-PCR法检测α-平滑肌肌动蛋白(α-SMA) mRNA表达,刺激0 d、1 d、3 d、5 d后,Western blotting法检测α-SMA蛋白表达。不同浓度ATRA干预,24 h后RT-PCR方法检测α-SMA mRNA表达,3 d后用Western blotting方法检测α-SMA蛋白表达。结果: (1) MTT法检测显示不同浓度ATRA以浓度依赖性方式抑制HFL-I细胞的增殖(P<0.05)。(2)5 μg/L TGF-β₁诱导后,HFL-I细胞中α-SMA mRNA和蛋白表达均上调(P<0.05)。(3) ATRA以浓度依赖性方式下调TGF-β₁诱导的α-SMA mRNA和蛋白的表达(P<0.05)。结论: ATRA能够抑制HFL-I细胞的增殖和TGF-β₁诱导的分化,该作用可能是通过下调α-SMA mRNA和蛋白的表达实现的。

Effect of all-trans-retinoic acid on the proliferation and expression of α-SMA in human embryonic lung fibroblasts

AIM: To investigate the effects of all-trans-retinoic acid (ATRA) on the proliferation and differentiation of transforming growth factor β₁(TGF-β₁)-stimulated human embryonic lung fibroblasts (HFL-I).METHODS: The HFL-I cells were cultured in vitro and were pretreated with ATRA for 3 days at the concentrations of 0.1 μmol/L, 1 μmol/L and 10 μmol/L. The proliferation of HFL-1 cells was detected by MTT method. The mRNA expression of α-smooth muscle actin(α-SMA) in HFL-I cells stimulated with TGF-β₁ for 0 h, 6 h, 12 h, 24 h, 48 h and 72 h was detected by RT-PCR and the protein expression of α-SMA at the time points of 1,3 and 5 days was detected by Western blotting. The mRNA expression of α-SMA in HFL-I cells pretreated with different concentrations of ATRA for 24 h was detected the by RT-PCR and the protein expression at time point of 3rd day was detected by Western blotting. RESULTS: Different concentration of ATRA inhibited the proliferation of HFL-I in a dose-dependent manner (P<0.05). Both mRNA and protein expression of α-SMA in HFL-I cells pretreated with TGF-β₁ was up-regulated (P<0.05). ATRA down-regulated the mRNA and protein expression of α-SMA induced by TGF-β₁ in a dose-dependent manner (P<0.05). CONCLUSION: ATRA inhibits the proliferation and TGF-β₁-stimulated differentiation in HFL-I cells by down-regulating the mRNA and protein expression of α-SMA.