RADIORESISTANT DERIVATIVES OF RADIOSENSITIVE CHO CELLS OBTAINED FOLLOWING TREATMENT WITH 5-AZACYTIDINE RETAIN THEIR SENSITIVITY TO CISPLATIN

被引:3
作者
HARAF, DJ [1 ]
DRUCKER, DR [1 ]
WEICHSELBAUM, RR [1 ]
DIAMOND, AM [1 ]
机构
[1] UNIV CHICAGO,DEPT RADIAT & CELLULAR ONCOL,5841 S MARYLAND,BOX 442,CHICAGO,IL 60637
关键词
D O I
10.2307/3577969
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Treatment of the radiation-sensitive CHO mutant, xrs-5, with the demethylating agent 5-azacytidine results in the complete conversion to wild-type levels of X-ray resistance in 50% of the colonies examined (10/20). In addition to being sensitive to X rays, xrs-5 is also sensitive to the killing effects of the crosslinking agent cisplatin. The 5-azacytidine-treated xrs-5 cells which exhibit wild-type survival levels following exposure to X rays failed to demonstrate conversion to wild-type levels of resistance to cisplatin. These results support the hypothesis that increases in gene expression can alter the radioresistance of xrs-5 cells without influencing the cells' survival after exposure to cisplatin.
引用
收藏
页码:226 / 229
页数:4
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