梁春柳;朱江波;朱玉平;姚朗;张天宝;

• 1:南方医科大学公共卫生与热带医学学院毒理学系
• 2:第二军医大学卫生毒理学教研室

摘要(Abstract)：

为揭示纳米氧化锌(ZnO)遗传毒作用特征,以便为纳米材料的安全性评价提供科学依据,利用胞质分裂阻滞微核细胞组学实验和碱性彗星实验比较了纳米和微米尺度ZnO的遗传毒性。结果显示:①微米尺度ZnO在0.02～2.5μg·mL-1剂量下对微核、核质桥、核芽和核分裂指数(nucleus divided index,NDI)均无显著诱导作用(P>0.05);而纳米尺度ZnO在>0.5μg·mL-1剂量时可显著诱导细胞产生总微核、Ⅰ型微核和核芽(P<0.05),且均存在一定的剂量-效应关系,剂量为2.5μg·mL-1时,细胞的Ⅱ型微核数、核质桥数和NDI与对照组相比,也呈现出显著差异(P<0.05)。②剂量为2.5μg·mL-1时,处理9、18和24h后,与对照组相比,微米ZnO处理组中细胞各项指标的差异均无统计学意义(P>0.05),而纳米ZnO处理组中总微核数、Ⅰ型微核数和核质桥数具有时间-效应关系。③纳米ZnO在0.5μg·mL-1剂量时可诱导DNA损伤,而微米ZnO在2.5μg·mL-1剂量时才产生损伤效应。研究表明,纳米和微米尺度ZnO在遗传毒作用性质和毒性强弱方面均存在明显差异,纳米ZnO会诱导Ⅰ型、Ⅱ型微核、核芽和核质桥的产生以及DNA损伤,而微米ZnO仅在高剂量时会诱导DNA损伤。

关键词(KeyWords)： 纳米氧化锌;微米氧化锌;彗星实验;微核;核质桥;核芽

Abstract:

Keywords:

基金项目(Foundation): 国家重大科学计划子课题(2006CB932505);; 上海市科委纳米专项基金(0752nm020)

作者(Author): 梁春柳;朱江波;朱玉平;姚朗;张天宝;

Email:

DOI:

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