Preferential platination of an activated cellular promoter by cis-diamminedichloroplatinum.
Preferential platination of an activated cellular promoter by cis-diamminedichloroplatinum.
复制标题
通过顺式二氯二氨铂优先对活化的细胞启动子进行铂化。
DOI：
10.1021/bi991079r
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发表时间：
1999
期刊：
影响因子：
2.9
通讯作者：
Gjerset,RA
中科院分区：
文献类型：
--
作者：
Haghighi,A;Lebedeva,S;Gjerset,RA
This study examines how accessibility to cisplatin on various genomic regions in T47D breast cancer cells, including the retinoic acid receptor β gene promoter and coding region and the dihydrofolate reductase gene promoter and coding region, is affected by treatment of the cells with 9-cisretinoic acid, a treatment that activates the retinoic acid receptor β gene promoter in these cells. A PCR-based assay was used to measure cisplatin adduct density based on the inhibition of PCR amplification of templates from cisplatin treated versus untreated cells. Treatment of cells with 9-cisretinoic acid enhanced accessibility to cisplatin on the retinoic acid receptor β gene promoter region, but not on the coding regions of that gene nor on the dihydrofolate reductase gene promoter or coding regions, where accessibilities to cisplatin remained 2−4 times lower than on the activated retinoic acid receptor β gene promoter. Examination of smaller regions within this promoter region showed a repression of platination in the 500 bp region surrounding the TATA box in cells prior to 9-cisretinoic acid treatment, which was abolished following promoter activation. Differences in sequence composition between the various regions could not fully account for differences in platination, suggesting that structural features such as bends in retinoic acid receptor β gene promoter DNA following gene activation, create energetically favorable sites for platination, and contribute to the cytotoxicity of the drug.
