Mechanistic studies on the anticancer activity of 2,4-disubstituted quinazoline derivative.

Mechanistic studies on the anticancer activity of 2,4-disubstituted quinazoline derivative.
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2,4-二取代喹唑啉衍生物抗癌活性的机理研究。

DOI:
10.1016/j.bbagen.2014.07.004
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发表时间:
2014
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Ding Li
Ding Li
中科院分区:
--
文献类型:
--
作者:
L. Su;Huaqin Zheng;Zeng Li;J. Qiu;Siqi Chen;Jinggong Liu;Tian;Jia;L. Gu;Zhishu Huang;Ding Li

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研究背景实体瘤和血液癌细胞的加速增殖与RNA聚合酶I加速核糖体DNA的转录,产生高水平的核糖体RNA有关。方法采用蛋白克隆、表达和纯化、电泳迁移率变动分析(EMSA)、圆二色性(CD)光谱、CD-熔解、等温滴定量热法(ITC)、染色质免疫沉淀(Ch-IP)、RNA干扰、RT-PCR、Western blot等方法,对RNA聚合酶I基因的表达进行了研究,并对RNA聚合酶I基因在肿瘤细胞中的表达情况进行了分析。结果2,4-二取代喹唑啉衍生物Sysu 12 d可通过稳定c-myc启动子G-quadruplex,下调核仁素的表达,并可破坏核仁素/G-quadruplex复合物,从而下调c-myc的表达。结论Sysu 12是一种新型的抗肿瘤先导化合物,其抗肿瘤作用机制的研究为Sysu 12的进一步开发奠定了基础。
BackgroundAccelerated proliferation of solid tumor and hematologic cancer cells is related to accelerated transcription of ribosomal DNA by the RNA polymerase I to produce elevated level of ribosomal RNA. Therefore, down-regulation of RNA polymerase I transcription in cancer cells is an important anticancer therapeutic strategy.MethodsA variety of methods were used, including cloning, expression and purification of protein, electrophoretic mobility shift assay (EMSA), circular dichroic (CD) spectroscopy, CD-melting, isothermal titration calorimetry (ITC), chromatin immunoprecipitation (Ch-IP), RNA interference, RT-PCR, Western blot, and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) cell assay.ResultsOur results showed that 2,4-disubstituted quinazoline derivativeSysu12dcould down-regulatec-mycthrough stabilization ofc-mycpromoter G-quadruplex, resulting in down-regulation of nucleolin expression.Sysu12dcould also disrupt nucleolin/G-quadruplex complex. Both of the above contributed to the down-regulation of ribosomal RNA synthesis, followed by activation of p53 and then cancer cell apoptosis.ConclusionsThese mechanistic studies set up the basis for further development ofSysu12das a new type of lead compound for cancer treatment.General significance2,4-Disubstituted quinazoline derivatives may have multi-functional effect for cancer treatment.
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