Telomere loss in cells treated with cisplatin.
basic_science · Level V
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- Record sourced from PubMed, PMID 9539717.
- Also identified by PMC identifier 22469.
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Abstract
Telomeres play an important role in the immortalization of proliferating cells. The long tandem repeats of 5'-TTAGGG-3' sequences in human telomeres are potential targets for the anticancer drug cisplatin, which forms mainly intrastrand d(GpG) and d(ApG) cross-links on DNA. The present study reveals that telomeres in cisplatin-treated HeLa cells are markedly shortened and degraded. A dose that killed 61% of the cells but allowed one round of cell division resulted in shortened telomeres before the induction of apoptosis. Higher doses of cisplatin halted cell cycle progression during the first S phase and triggered apoptosis followed by degradation of telomere repeats. A model in which both cell division with incomplete replication and induction of apoptosis by cisplatin could occur was devised to explain the drug-induced telomere loss.
Medical subject headings
- Apoptosis
- Cell Cycle
- Cisplatin
- Telomere