THE KINETICS OF CHROMOSOME AND DNA-DAMAGE BY STREPTONIGRIN IN CHO CELLS

被引：16

作者：

TESTONI, MI ^{[1
]}

BIANCHI, NO ^{[1
]}

BIANCHI, MS ^{[1
]}

机构：

[1] IMBICE, RA-1900 LA PLATA, ARGENTINA

来源：

MUTATION RESEARCH-ENVIRONMENTAL MUTAGENESIS AND RELATED SUBJECTS | 1995年 / 334卷 / 01期

关键词：

STREPTONIGRIN; DNA DAMAGE; SCE; CHROMOSOMAL ABERRATIONS;

D O I：

10.1016/0165-1161(95)90027-6

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

CHO cells were pulse-treated for 20 min with increasing doses of streptonigrin (SN). First division cells analyzed 18 h after the end of treatment showed a combination of chromosome and chromatid aberrations with a typical dose-response curve. The frequency of SCEs in second division cells (24 h harvesting time) also exhibited a positive correlation with the SN dose. A high incidence of chromatid aberrations was detected in second and third division metaphases. This indicates that SN has a persistent clastogenic action that lasts for at least three cell cycles after the end of treatment. The kinetics of DNA damage and repair was studied by the alkaline unwinding and single cell gel methods. It was found that a pulse treatment with SN elicited a triphasic response characterized by repair-damage-repair. It is proposed that SN forms stable complexes with the DNA. These complexes by a continuous cycling redox process would produce active oxygen species inducing direct damage to DNA.

引用

页码：23 / 31

页数：9

共 14 条

[1] MECHANISM OF DEGRADATION OF DNA BY STREPTONIGRIN [J].