?AIM:To investigate the effects of Bevacizumab on the proliferation and the expression of E -Cadherin and fibronectin in human retinal pigment epithelial cell ( ARPE-19) in vitro.?METHODS: Different concentrations (0, 0.625, 1.25, 2.5, 5.0mg/mL) of bevacizumab were exposed to ARPE-19 cells, then cell viability was analyzed by CCK-8, cell cycle was determined by flow cytometry, and the expression of E-Cadherin and fibornectin was detected by Western blot and RT-PCR.?RESULTS:The concentration as 2.5mg/mL or 5.0mg/mL of bevacizumab was shown to effectively suppress the proliferation and cell cycle of ARPE-19 cell (P<0.05). In addition, 2.5mg/mL or 5.0mg/mL of bevacizumab could downregulate the expression of E-cadherin and promote the transcription of fibronection gene (P<0.05).?CONCLUSION:High concentration of bevacizumab was able to inhibit ARPE-19 proliferation, downregulate E-Cadherin expression and promote fibronectin expression, indicating epithelial-mesenchymal transition induced by bevacizumab in ARPE-19 cell.%目的：观察贝伐单抗对体外培养的人视网膜色素上皮细胞ARPE－19增殖及钙黏连蛋白（ E－cadherin ）和纤维连接蛋白（ fibronectin ）表达变化的作用，探讨贝伐单抗对ARPE－19增殖及纤维化的影响。方法：用不同浓度（0、0．625、1．25、2．5、5．0mg／mL）的贝伐单抗干预体外培养人视网膜色素上皮细胞ARPE－19，采用CCK－8法分别于24、48、72 h检测细胞活性；流式细胞仪检测细胞周期；应用免疫蛋白印迹法（ Western blotting）及逆转录聚合酶链反应（RT－PCR）检测ARPE－19中E－cadherin和fibronectin的蛋白及mRNA的表达变化。结果：浓度为2．5、5．0 mg／mL贝伐单抗能有效抑制ARPE－19细胞的增殖及细胞周期，差异有统计学意义（ P＜0.05）。2．5、5．0 mg／mL贝伐单抗能抑制E－cadherin 基因，促进fibronectin基因的转录及表达，差异有统计学意义（P＜0．05）。结论：高浓度的贝伐单抗能够抑制ARPE－19细胞的增殖，下调纤维化相关因子E－cadherin ，同时上调fibronectin的表达，提示高浓度的贝伐单抗可以引起ARPE－19细胞纤维化。
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