Disubstituted 1,8-dipyrazolcarbazole derivatives as a new type of c-myc G-quadruplex binding ligands
作者:Wei-Jia Chen、Chen-Xi Zhou、Pei-Fen Yao、Xiao-Xiao Wang、Jia-Heng Tan、Ding Li、Tian-Miao Ou、Lian-Quan Gu、Zhi-Shu Huang
DOI:10.1016/j.bmc.2012.03.031
日期:2012.5
A series of 1,8-dipyrazolcarbazole (DPC) derivatives (6a-6d, 7a-7d) designed as G-quadruplex ligands have been synthesized and characterized. The FRET-melting and SPR results showed that the DPC derivatives could well recognize G-quadruplex with strong discrimination against the duplex DNA. In addition, the DPC derivatives showed much stronger stabilization activities and binding affinities for c-myc G-quadruplex rather than telomeric G-quadruplex. Therefore, their interactions with c-myc G-quadruplex were further explored by means of CD spectroscopy, PCR-stop assay, and molecular modeling. In cellular studies, all compounds showed strong cytotoxicity against cancer cells, while weak cytotoxicity towards normal cells. RT-PCR assay showed that compound 7b could down-regulate c-myc gene expression in Ramos cell line, while had no effect on c-myc expression in CA46 cell line with NHE III1 element removed, indicating its effective binding with G-quadruplex on c-myc oncogene in vivo. (C) 2012 Elsevier Ltd. All rights reserved.