纳米二氧化钛短期经口染毒对幼年大鼠骨髓细胞的遗传损伤作用  被引量:1

Genotoxic effects of oral-exposed TiO2 nanoparticles on bone marrow cells in young rats

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作  者:王云[1] 陈章健[1] 巴特[1] 濮吉[1] 顾永恩[1] 郭健[1] 贾光[1] 

机构地区:[1]北京大学医学部公共卫生学院劳动卫生与环境卫生学系,100191

出  处:《中华预防医学杂志》2014年第9期815-818,共4页Chinese Journal of Preventive Medicine

基  金:基金项目:国家重点基础研究发展计划(2011CB933402);北京市自然科学基金(7132117);高等学校博士学科点专项科研基金(20110001120027)

摘  要:目的 探讨纳米二氧化钛灌胃染毒对幼年大鼠骨髓细胞的遗传损伤作用。方法 将28只清洁级雄性sD幼年大鼠(4周龄),按体重以随机数字表法分为4组(每组7只),每天1次灌胃,分别给予0、10、50、200mg/kg纳米二氧化钛[(75±15)nm,锐钛矿],染毒30d后取骨髓细胞涂片,进行微核试验和γ-H2AX免疫荧光检测。结果 50mg/kg纳米二氧化钛染毒组大鼠的γ-H2AX焦点阳性细胞率[(37.4±10.0)%],明显高于对照组[(19.8±3.1)%],差异有统计学意义(t=-17.59,P〈0.01)。各染毒组大鼠与对照组相比,骨髓嗜多染红细胞与正染红细胞的比值(PCE/NCE)和嗜多染红细胞微核率无明显变化。结论 短期经口摄入纳米二氧化钛,可导致幼年大鼠骨髓细胞DNA双链断裂增加,但对骨髓细胞微核无明显影响。Objective To explore the genotoxic effects of oral-exposed TiO2 nanoparticles on bone marrow cells in young rats. Methods Twenty-eight SD male young rats (4 weeks old) were randomly divided into 4 groups, which were exposed to TiO2 nanoparticles ((75±15 ) nm, anatase) through intragastric administration at 0, 10, 50 and 200 mg/kg body weight (bw) every day for 30 days. The bone marrow cells were collected for micronuclei and γ-H2AX immunofluorescence analysis. Results The percentage of γ-H2 AX loci-positive cells (37.4±10. 0) % in the 50 mg/kg bw dose group were significantly higher than that in the control group ( 19. 8 ± 3.1 ) % ( t value was - 17.59, P 〈 0. 01 ). No significantly difference was found in polychromatic erythrocyte/normochromatic erythrocyte (PCE/NCE) ratio and PCE micronucleus rate between three experimental groups and control group. Conclusion TiO2 nanoparticles can increase the frequency of DNA double-strand breaks in bone marrow cells, but has no effect on micronucleus of bone marrow cells in young rats.

关 键 词:纳米粒  大鼠 DNA损伤 安全 

分 类 号:R114[医药卫生—卫生毒理学]

 

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