癌变·畸变·突变 ›› 2001, Vol. 13 ›› Issue (2): 74-076.doi: 10.3969/j.issn.1004-616x.2001.02.003

• 论著 • 上一篇    下一篇

甲醛和丝裂霉素C 的DNA 交联作用研究

张遵真, 衡正昌   

  1. 华西医科大学环境卫生教研室, 四川 成都 610041
  • 收稿日期:2000-08-02 修回日期:2000-11-21 出版日期:2001-04-30 发布日期:2001-04-30

STUDY ON THE EFFECTS OF DNA CROSSLINKS OF FORMALDEHYDE AND MITOMYCINE C

ZHANG Zun-zhen, HENG Zheng-chang   

  1. Department of Environmental Health, West China University of Medical Sciences, Chengdu 610041, China
  • Received:2000-08-02 Revised:2000-11-21 Online:2001-04-30 Published:2001-04-30

摘要: 目的:探讨用彗星试验检测DNA 交联剂作用的时间 效应关系及验证其应用的可行性。方法:以过氧化氢(H2O2 ) 作标准DNA 断裂剂,用彗星试验对甲醛诱导TK6 细胞DNA 交联作用的时间2效应关系进行了探讨,并用甲醛和丝裂霉素C 进行了验证。结果:在一定浓度范围内,随着甲醛和丝裂霉素C 浓度的增加,由H2O2 造成的TK6 细胞DNA 迁移距离逐渐减小。时间效应的研究表明,在H2O2 浓度一定时,随着甲醛染毒时间的延长,其DNA 交联作用增加。结论:彗星试验既可检测DNA-蛋白质交联又可检测DNA-DNA 交联,对DNA-蛋白质交联的检测更敏感。

关键词: 甲醛, 丝裂霉素C, DNA 交联, 彗星试验

Abstract: Purpose : To explore the time-course effect s in detecting DNA crosslinks with comet assay and to prove the feasibility of comet assay for detecting DNA crosslinks. Method : Hydrogen peroxide (H2O2) was used as standard DNA breaking agent , the relationship of time2effect s of DNA crosslinks in TK6 cells induced by formaldehyde (FA) was studied using comet assay. Meanwile , two kinds of DNA crosslinking agent s ( FA and mitomycine c) were tested and verified. Results : The length of DNA migration caused by H2O2 decreased with the increase in the dosage of FA and MMC within the doses given. The investigation of time2course effects of DNA crosslinks showed that the action of DNA crosslinks increased with increase in the exposure time of FA.Conclusion : The comet assay could detect both DNA2protein crosslinks and DNA2DNA crosslinks. The cometassay was more sensitive for detecting DNA2protein crosslinks than detecting DNA2DNA crosslinks.

Key words: Formaldehyde, Mitomycin C, DNA crosslinks, Cometassay

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