王秀娟;李婷竹;陆强;苏雪荣;薛玉英;唐萌;

• 1:环境医学工程教育部重点实验室
• 2:东南大学公共卫生学院&苏州纳米科技协同创新中心
• 3:江苏省生物材料与器件重点实验室

摘要(Abstract)：

为了探讨纳米银对HepG2细胞DNA损伤、染色体畸变等遗传毒性指标的影响,以期为纳米银体外遗传毒性评价提供参考依据,本文采用2种纳米银材料(20 nm-PVP包被纳米银、20 nm-无包被纳米银),分别以20μg·mL~(-1)、40μg·mL~(-1)、80μg·mL~(-1)、160μg·mL~(-1)的剂量对HepG2细胞染毒24 h,用Hoechst-33258染色法检测细胞凋亡,彗星实验检测DNA损伤,胞质分裂阻滞微核细胞组学试验法检测染色体畸变。结果表明,20 nm Ag NPs组在160μg·mL~(-1)时引起细胞凋亡数显著增多(P<0.05);20 nm PVP-Ag NPs组在80μg·mL~(-1)和160μg·mL~(-1)剂量组中细胞凋亡数显著增多(P<0.01)。2种纳米银引起HepG2细胞发生细胞凋亡,并呈剂量效应关系。彗星试验结果表明,20 nm Ag NPs和20 nm PVP-Ag NPs在40μg·mL~(-1)、80μg·mL~(-1)、160μg·mL~(-1)剂量组中,Olive尾矩、尾长和尾部DNA百分比与空白对照组相比均有显著差异(P<0.05)。2种纳米银对HepG2细胞DNA损伤程度为:20 nm Ag NPs>20 nm PVP-Ag NPs。胞质分裂阻滞微核细胞组学试验结果表明,2种纳米银均不会引起核质桥数发生明显改变(P>0.05),20 nm Ag NPs在高染毒剂量下引起微核总数、I型微核、II型微核、核芽数明显升高(P<0.05);20 nm PVP-Ag NPs在各染毒剂量下均会引起微核总数及I型微核数量升高(P<0.01),II型微核数在160μg·mL~(-1)剂量下升高明显(P<0.01),剂量大于20μg·mL~(-1)时核芽数升高(P<0.01)。20 nm PVP-Ag NPs对细胞核的影响大于20 nm Ag NPs(P<0.05)。总之,2种纳米银材料均会引起HepG2细胞DNA损伤及染色体畸变等遗传毒性效应的改变,无包被纳米银比PVP包被纳米银更容易引起DNA损伤,PVP包被纳米银比无包被纳米银更容易引起细胞染色体畸变相关效应;2种材料对HepG2细胞的损伤存在浓度-效应关系,浓度越高遗传毒性损伤越严重。

关键词(KeyWords)： 纳米银;HepG2细胞;彗星实验;微核;剂量-效应关系

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(81573186,81473003);; 大学生创新创业计划训练项目(201710286130)

作者(Author): 王秀娟;李婷竹;陆强;苏雪荣;薛玉英;唐萌;

Email:

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