基于COL1A1启动子的抗肝纤维化药物高通量筛选模型的建立及应用

Establishment and application of a high-throughput drug screening model based on COL1A1 promoter for anti-liver fibrosis

为了有效筛选潜在的抗肝纤维化药物,本实验室建立了基于COL1A1启动子的高通量筛选细胞模型。该细胞模型在TGF-β1的刺激下,激活COL1A1启动子及荧光素酶报告基因的表达,而该激活作用可以被候选化合物抑制。作者首先构建COL1A1启动子和荧光素酶报告载体p GL4.17的重组质粒。采用双荧光素酶报告基因检测系统对该启动子的活性进行检测,发现重组质粒比对照组荧光素酶活性高15.98倍。该质粒转染到人肝星状细胞株LX2中,用无限稀释法得到单克隆细胞株,并利用活体成像仪筛选出稳定表达COL1A1启动子的单克隆细胞株LX2-COL。经TGF-β1诱导后检测该单克隆细胞株LX2-COL对候选化合物（S1~S7）的反应性,其中S7对启动子活性抑制作用最强。Real-time RT-PCR和Western blotting验证了经该细胞模型筛选得到的化合物S7能够抑制Ⅰ型胶原m RNA和蛋白水平的表达。结果表明,该细胞模型的建立能够实现对潜在的抗肝纤维化化合物的高通量筛选。

For screening the potential drugs as anti-liver fibrosis candidates, we established a high- throughput drug screening cell model based on COL1A1 promoter. The activity of COL1A1 promoter and luciferase reporter gene can be elevated by TGF-β1, and inhibited by candidate drugs. We constructed a recombined plasmid with COL1A1 promoter and luciferase reporter gene p GL4.17, the activity of COL1A1 promoter was reflected by fluorescence intensity. COL1A1 promoter activity was detected by Dual-Luciferase Reporter Assay System, it came that the relative luciferase activity of COL1A1 promoter was 15.98 times higher than that of control group induced by TGF-β1, showing the recombined plasmid could be used in cell model. The recombined plasmid was transfected into human hepatic stellate cells LX2, detected the effect of potential drugs, and obtained a stable expression system through stable transfection and monoclonal cell culture. A sample which could reduce COL1A1 promoter activity signally by our cell model, decreased collagen Ⅰ m RNA and protein expression detected by real-time RT-PCR and Western blotting. It indicates this novel cell model can be used in high-throughput drug screening of potential anti-liver fibrosis drugs.