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Cyclic induction of senescence with intermittent AZT treatment accelerates both apoptosis and telomere loss

Other Titles
 Cyclic induction of senescence with intermittent AZT treatment accelerates both apoptosis and telomere loss 
Authors
 Hyun Jung Ji  ;  Sun Young Rha  ;  Hei Cheul Jeung  ;  Sang Hwa Yang  ;  Sung Whan An  ;  Hyun Cheol Chung 
Citation
 Breast Cancer Research and Treatment, Vol.93(3) : 227-236, 2005 
Journal Title
 Breast Cancer Research and Treatment 
ISSN
 0167-6806 
Issue Date
2005
Abstract
BACKGROUND: 3'-azido-2',3'-dideoxythymidine (AZT) is phosphorylated intracellularly to 3'-azido-3'-deoxythymidine-5'-triphosphate (AZT-TP), which is incorporated into telomeric DNA, thereby blocking chain elongation. AZT is also known to inhibit reverse transcriptase, as well as other cellular enzymes including DNA polymerase gamma, thymidine kinase, and telomerase. METHODS: We induced cancer cell senescence by treating MCF-7 cells with AZT in dosages of IC10 and IC20 for an extended period (about 120 population doublings (PD)). We then investigated the sequential changes in cellular growth, expression of telomerase subunits and transcription factors (c-Myc, Mad1), telomerase activity and telomere length. RESULTS: Senescence, apoptosis, growth delay, inhibition of telomerase activity and shortening of telomere length were all observed in a dose- and time-dependent manner. After the onset of senescence, the apoptosis rate increased slowly during early PDs. In contrast to senescence, the apoptotic rate showed little change after AZT removal, while it increased suddenly and significantly in a dose-dependent manner upon the second introduction of AZT. Continuous shortening of the telomeric length was observed with AZT, and, upon re-exposure to AZT, shortening of the telomere occurred more rapidly than with first exposure. Of the telomerase subunits, telomerase reverse transcriptase (hTERT) and c-Myc were the first to show a reduction in activity after AZT treatment, followed by changes in hTER , Mad1 and hTEP-1. CONCLUSION: Cyclic treatment with AZT initially suppressed hTERT and c-Myc, followed by suppression of hTER, Mad1 and hTEP-1. Furthermore, the treatment accelerated both telomere loss and apoptosis, even when administered at a senescence-inducing dosage level.
Full Text
http://link.springer.com/article/10.1007%2Fs10549-005-5156-0
DOI
10.1007/s10549-005-5156-0
Appears in Collections:
1. Journal Papers (연구논문) > 5. Research Institutes (연구소) > Cancer Metastasis Research Center (암전이연구센터)
1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실)
1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Yonsei Biomedical Research Center (연세의생명연구원)
Yonsei Authors
라선영(Rha, Sun Young) ORCID logo https://orcid.org/0000-0002-2512-4531
안성환(An, Sung Whan)
양상화(Yang, Sang Hwa)
정현철(Chung, Hyun Cheol) ORCID logo https://orcid.org/0000-0002-0920-9471
정희철(Jeung, Hei Cheul)
지현정(Jee, Hyun Joong)
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URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/150782
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