Dimeric aryl-substituted imidazoles may inhibit ALT cancer by targeting the multimeric G-quadruplex in telomere.

Abstract:

:In 10-15% of cancers, telomere maintenance is provided by a telomerase-independent mechanism known as alternative lengthening of telomere (ALT), making telomerase inhibitors ineffective on these cancers. Ligands that stabilize telomeric G-quadruplex (G4) are considered to be able to inhibit either the ALT process or disrupt the T-loop structure, which would be promising therapeutic agents for ALT cancers. Notably, the 3'-terminal overhang of telomeric DNA might fold into multimeric G4 containing consecutive G4 subunits, which offers an attractive target for selective ligands considering large numbers of G4s widespread in the genome. In this study, a dimeric aryl-substituted imidazole (DIZ-3) was developed as a selective multimeric G4 ligand based on a G4-ligand-dimerizing strategy. Biophysical experiments revealed that DIZ-3 intercalated into the G4-G4 interface, stabilizing the higher-order structure. Furthermore, this ligand was demonstrated to induce cell cycle arrest and apoptosis, and thus inhibited cell proliferation in an ALT cancer cell line. Cancer cells were more sensitive to DIZ-3, relative to normal cells. Notably, DIZ-3 had little effect on the transcription of several G4-dependent oncogenes. This study provides a nice example for discovering dimeric agents to potentially treat ALT cancers via targeting telomeric multimeric G4.

journal_name

Eur J Med Chem

authors

Hu MH,Lin XT,Liu B,Tan JH

doi

10.1016/j.ejmech.2019.111891

subject

Has Abstract

pub_date

2020-01-15 00:00:00

pages

111891

eissn

0223-5234

issn

1768-3254

pii

S0223-5234(19)31043-8

journal_volume

186

pub_type

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