Abstract
目的 研究bevacizumab(avastin)对猪视网膜色素上皮(RPE)细胞的毒性作用,进一步探讨该药物的安全剂量.方法 30只猪眼RPE细胞培养于含质量分数20%胎牛血清的DMEM培养基中,透射电镜下观察细胞内含大量色素,免疫荧光检测抗角蛋白抗原阳性.实验分为对照组(0g/L bevacizumab)和实验组(0.125、0.25、0.5、1.0、1.25、2.0、2.5g/L bevacizumab).MTT比色法测定不同终质量浓度(0、0.125、0.25、0.5、1.0、1.25、2.0、2.5g/L) bevacizumab对RPE细胞增生的影响;流式细胞术检测bevacizumab作用72h后细胞凋亡和细胞周期的变化,倒置相差显微镜和透射电子显微镜下观察细胞形态和超微结构的改变.结果 2.0~2.5g/L bevacizumab作用72h后,与对照组比较RPE细胞的生长均有明显抑制(t=1.300,P=0.000;t=1.300,P=0.000),且呈质量浓度依赖性;实验组S期细胞较对照组减少,细胞凋亡率与对照组比较差异无统计学意义(χ2=1.870,P=0.240).光学显微镜下,2.0g/L bevacizumab组细胞形态无明显变化.透射电子显微镜下,2.0g/L bevacizumab组细胞微绒毛减少,细胞质内出现空泡和髓鞘样变性.结论 大剂量bevacizumab可抑制猪眼RPE细胞的有丝分裂,抑制细胞增生,明显破坏细胞的超微结构。
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