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Administration of a Nucleoside Analog Promotes Cancer Cell Death in a Telomerase-Dependent Manner.


ABSTRACT: Telomerase, the end-replication enzyme, is reactivated in malignant cancers to drive cellular immortality. While this distinction makes telomerase an attractive target for anti-cancer therapies, most approaches for inhibiting its activity have been clinically ineffective. As opposed to inhibiting telomerase, we use its activity to selectively promote cytotoxicity in cancer cells. We show that several nucleotide analogs, including 5-fluoro-2'-deoxyuridine (5-FdU) triphosphate, are effectively incorporated by telomerase into a telomere DNA product. Administration of 5-FdU results in an increased number of telomere-induced foci, impedes binding of telomere proteins, activates the ATR-related DNA-damage response, and promotes cell death in a telomerase-dependent manner. Collectively, our data indicate that telomerase activity can be exploited as a putative anti-cancer strategy.

SUBMITTER: Zeng X 

PROVIDER: S-EPMC6072277 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature

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Administration of a Nucleoside Analog Promotes Cancer Cell Death in a Telomerase-Dependent Manner.

Zeng Xuehuo X   Hernandez-Sanchez Wilnelly W   Xu Mengyuan M   Whited Tawna L TL   Baus Diane D   Zhang Junran J   Berdis Anthony J AJ   Taylor Derek J DJ  

Cell reports 20180601 10


Telomerase, the end-replication enzyme, is reactivated in malignant cancers to drive cellular immortality. While this distinction makes telomerase an attractive target for anti-cancer therapies, most approaches for inhibiting its activity have been clinically ineffective. As opposed to inhibiting telomerase, we use its activity to selectively promote cytotoxicity in cancer cells. We show that several nucleotide analogs, including 5-fluoro-2'-deoxyuridine (5-FdU) triphosphate, are effectively inc  ...[more]

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