J4 ›› 2012, Vol. 38 ›› Issue (3): 495-500.

• 基础研究 • 上一篇    下一篇

巯基乙酸-碲化镉量子点对人肝细胞毒性和DNA损伤的诱导作用

李艳博1|张海霞2|郭彩霞1|金明华3|于永波1|黄沛力1|孙志伟1,3   

  1. 1. 首都医科大学公共卫生与家庭医学学院|北京 100069;2. 北京市朝阳区疾病预防控制中心|北京 100021;3. 吉林大学公共卫生学院卫生毒理学教研室|吉林 长春 130021
  • 收稿日期:2011-11-08 出版日期:2012-05-28 发布日期:2012-05-28
  • 通讯作者: 孙志伟(Tel:010-83911507,E-mail:zwsun@ccmu.edu.cn);郭彩霞(Tel:010-83911774,E-mail:guocx@ccmu.edu.cn) E-mail:zwsun@ccmu.edu.cn
  • 作者简介:李艳博(1981-)|男|黑龙江省肇东市人|讲师|医学博士|主要从事肿瘤治疗和毒理学安全性评价的研究。
  • 基金资助:

    北京市教育委员会创新团队项目资助课题(PHR201107116);北京市属高等学校人才强教深化计划项目资助课题(PHR201006110)

Induction of thioglycolic acid-capped cadmium selenide quantum dots on hepatotoxicity and DNA damage in human hepatic cells

LI Yan-bo1,ZHANG Hai-xia2,GUO Cai-xia1,JIN Ming-hua3,YU Yong-bo1,HUANG Pei-li1,SUN Zhi-wei 1,3   

  1. 1.School of Public Health and Family Medicine,Capital Medical University,Beijing 100069,China;2. Beijing Chaoyang District Center for Disease Control and Prevention,Beijing 100021,China;3. Department of Hygienic Toxicology,School of Public Health,Jilin University,Changchun 130021,China
  • Received:2011-11-08 Online:2012-05-28 Published:2012-05-28

摘要:

目的:研究巯基乙酸(TGA)包覆的碲化镉(CdTe)量子点(QDs)对人正常肝HL-7702细胞的毒性和DNA损伤的作用,为QDs毒理学研究和安全性评价提供实验依据。方法:实验设立对照组和不同浓度CdTe QDs作用组(浓度分别为6.25、12.50、25.00和50.00 mg/L)。CdTe QDs作用于HL-7702细胞后,分别采用MTT法检测细胞增殖变化,单细胞凝胶电泳法(SCGE)检测细胞DNA损伤情况,PI单染流式细胞术(FCM)检测细胞周期变化,AO/EB双荧光染色法和Annexin Ⅴ- FITC/PI双染FCM检测细胞凋亡情况。结果:MTT法,CdTe QDs可抑制HL-7702细胞增殖,并存在剂量-效应和时间-效应关系;SCGE和PI单染FCM法,CdTe QDs作用于HL-7702细胞24 h后,随着剂量的增加,DNA损伤率逐渐增高,G0/G1期细胞百分率显著下降,S期和G2/M期细胞百分率明显上升(P<0.05);AO/EB检测,CdTe QDs作用后细胞出现凋亡形态学改变;Annexin Ⅴ-FITC/PI双荧光标记FCM法,CdTe QDs染毒可促进细胞凋亡,各剂量组细胞凋亡率与对照组比较差异有统计学意义(P<0.05)。结论:CdTe QDs可影响细胞存活,引起DNA损伤、细胞周期阻滞,并诱导细胞凋亡。

关键词: 碲化镉;量子点;细胞活力;DNA损伤;细胞周期;细胞凋亡

Abstract:

Objective
To investigate the hepatotoxicity and DNA damage induced by thioglycolic acid (TGA)-capped cadmium telluride (CdTe) quantum dots(QDs) in human hepatic cells HL-7702,and to provide experimental evidence for the toxicological research and safety evaluation.Methods The HL-7702 cells were divided into control group and CdTe QDs-treated groups with different concentrations of CdTe QDs(0,6.25,12.50,25.00 and 50.00 mg/L, respectively).After  treated with CdTe QDs,the cell proliferation was measured by MTT assay,the DNA damage by single cell gel electrophoresis (SCGE),the cell cycle process by propidium iodide (PI)-flow cytometry (FCM) and the  apoptosis by acridine orange/ethidium bromide (AO/EB) assay and Annexin Ⅴ- fluorescein isothiocyanate (FITC)/PI-FCM.Results The MTT results showed that CdTe QDs inhibited the proliferation of HL-7702 cells in a dose-dependent and time-dependent manner.The results acquired by SCGE and FCM with PI staining showed that after CdTe QDs exposure for 24 h,as exposure dose increased,the degree of DNA damage raised, and the percentage of HL-7702 cells in G0/G1 phase was decreased while they were significantly increased in S and G2/M phases (P<0.05).In AO/EB assay,the apoptotic cells were observed under fluorescence microscope;In Annexin Ⅴ-FITC/PI-FCM,the apoptotic rates in CdTe QDs groups were significantly increased compared with  control group (P<0.05). Conclusion CdTe QDs could influence the cell viability,and induce DNA damage,S and G2/M phases arrest and apoptosis in HL-7702 cells.

Key words: cadmium telluride;quantum dots;cell viability;DNA damage;cell cycle;apoptosis

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