期刊
EUROPEAN JOURNAL OF CANCER
卷 36, 期 6, 页码 796-802出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0959-8049(00)00017-4
关键词
genistein; colon cancer; comet assay; DNA breakage; apoptosis
类别
资金
- NCI NIH HHS [T32-CA09432, CA62184] Funding Source: Medline
The present study was undertaken to determine if (a) genistein induces topo II-mediated DNA damage in HT-29 colon cancer cells: and (b) if this damage is required to induce apoptosis. DNA damage was evaluated using the comet assay. Apoptosis was deter-mined by the ethidium bromide/acridine orange staining technique. DNA breakage was noted within 1 h of treatment. Apoptosis was only induced with high concentrations (greater than or equal to 60 mu M) of genistein. Marked inhibition of HT-29 cell growth was evident at concentrations ranging from 60 to 150 mu M. This was associated with a cell cycle arrest at G(2)-/M. Similar findings were obtained in SW-620 and SW-1116 colon cancer cell lines. Aclarubicin, a topo II antagonist, reduced genistein-induced DNA breaks but did not reduce apoptosis. These data suggest that. in colon cancer cells, topo II serves us the enzymatic target of genistein. Furthermore, topo II-mediated DNA cleavage is not required for the induction of apoptosis. (C) 2000 Published by Elsevier Science tld. All rights reserved.
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