Abstract
The reactivation of telomerase activity in most cancer cells supports the concept that telomerase is a relevant target in oncology, and telomerase inhibitors have been proposed as new potential anticancer agents. The telomeric G-rich single-stranded DNA can adopt an intramolecular G-quadruplex structure in vitro, which has been shown to inhibit telomerase activity. The C-rich sequence can also adopt a quadruplex (intercalated) structure (i-DNA). Two acridine derivatives were shown to increase the melting temperature of the G-quadruplex and the C-quadruplex at 1 μM dye concentration. The increase in Tm value of the G- quadruplex was associated with telomerase inhibition in vitro. The most active compound, “BisA”. showed an IC50 value of 0.75 μM in a standard TRAP assay.
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