纳米银对中国仓鼠肺成纤维细胞的细胞毒性和遗传毒性
Keywords: 纳米银,中国仓鼠肺成纤维细胞,细胞毒性,遗传毒性,细胞周期,凋亡
Abstract:
?目的:?研究纳米银对中国仓鼠肺成纤维细胞(chl)的细胞毒性和遗传毒性并探讨其作用机制。方法:以梯度浓度(2.5、5.0、10.0、20.0、40.0和80.0?μg/ml)纳米银染毒chl细胞,mtt比色法计算ic50以评估纳米银的细胞毒性水平。利用pi染色分析细胞周期变化并计算细胞增殖指数;annexin?v-fitc和pi双染检测细胞凋亡和坏死发生率,同时观察细胞染毒后的形态变化,记录前向角散射(fsc)和侧向角散射(ssc)信号;giemsa染色中期分裂相涂片分析染色体畸变发生率。结果:纳米银毒性水平与纳米银浓度呈正相关(r=0.804,p<0.05),ic50为21.68?μg/ml。22.0?μg/ml纳米银与chl细胞接触24?h后,细胞形态发生明显改变;细胞群ssc信号显著增强,为细胞摄入纳米银提供间接证据;细胞周期在g2/m期被捕获,对g0/g1期、s期以及细胞增殖指数变化情况影响显著(p<0.01);22.0?μg/ml纳米银染毒chl?24?h后凋亡发生率与对照组差异明显(p<0.01);各浓度纳米银诱导染色体结构畸变率均大于5%(p<0.01),中高浓度四倍体发生率达到溶剂对照组的10倍以上(p<0.01)。结论:纳米银对chl细胞有显著的细胞毒性和遗传毒性,线粒体功能受损、细胞凋亡在纳米银的细胞毒性和遗传毒性中起到重要作用。
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