期刊
NUCLEIC ACIDS RESEARCH
卷 45, 期 4, 页码 1606-1618出版社
OXFORD UNIV PRESS
DOI: 10.1093/nar/gkw1195
关键词
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资金
- National Natural Science Foundation of China [81330077, 91213302, 21272291]
- Guangdong Natural Science Funds for Distinguished Young Scholars [2015A030306004]
- Guangdong Provincial Key Laboratory of Construction Foundation [2011A060901014]
Multiple G-quadruplex units in the 3-terminal overhang of human telomeric DNA can associate and form multimeric structures. The specific targeting of such distinctive higher-order G-quadruplexes might be a promising strategy for developing selective anticancer agents with fewer side effects. However, thus far, only a few molecules were found to selectively bind to telomeric multimeric G-quadruplexes, and their effects on cancer cells were unknown. In this study, a new triaryl-substituted imidazole derivative called IZNP-1 was synthesized and found to specifically bind to and strongly stabilize telomeric multimeric G-quadruplexes through intercalating into the pocket between the two quadruplex units. The pocket size might affect the binding behavior of IZNP-1. Further cellular studies indicated that IZNP-1 could provoke cell cycle arrest, apoptosis and senescence in Siha cancer cells, mainly because of telomeric DNA damage and telomere dysfunction induced by the interactions of IZNP-1 with telomeric G-quadruplexes. Notably, IZNP-1 had no effect on the transcriptional levels of several common oncogenes that have the potential to form monomeric G- quadruplex structures in their promoter regions. Such behavior differed from that of traditional telomeric G-quadruplex ligands. Accordingly, thiswork provides newinsights for the development of selective anticancer drugs targeting telomeric multimeric G-quadruplexes.
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