Cisplatin-mediated DNA double-strand breaks in replicating but not in quiescent cells of the yeast Saccharomyces cerevisiae

DNA double-strand breaks (DSBs) are formed during the processing of DNA interstrand crosslinks in replicating yeast and Chinese hamster cells exposed to DNA crosslinkers such as psoralen plus UVA or nitrogen mustard. They were also detected in human cells after treatment with photoactivated psoralen...

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Bibliographic Details
Published in:Toxicology (Amsterdam) 2005-09, Vol.212 (2), p.175-184
Main Authors: Frankenberg-Schwager, Marlis, Kirchermeier, Dorothea, Greif, Goetz, Baer, Karin, Becker, Manuela, Frankenberg, Dieter
Format: Article
Language:English
Subjects:
Antineoplastic Agents - toxicity
Biological and medical sciences
Cisplatin - toxicity
Cisplatin-mediated DNA interstrand crosslinks and double-strand breaks
Cross-Linking Reagents - toxicity
DNA Damage
DNA Repair
DNA Replication
DNA, Fungal
Homologous recombination
Medical sciences
Replicating versus quiescent yeast cells
Saccharomyces cerevisiae
Saccharomyces cerevisiae - drug effects
Saccharomyces cerevisiae - genetics
Saccharomyces cerevisiae - growth & development
Temperature
Toxicology
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Summary:DNA double-strand breaks (DSBs) are formed during the processing of DNA interstrand crosslinks in replicating yeast and Chinese hamster cells exposed to DNA crosslinkers such as psoralen plus UVA or nitrogen mustard. They were also detected in human cells after treatment with photoactivated psoralen or mitomycin C. In contrast, no DSBs were observed after exposure of Chinese hamster cells to cisplatin, another crosslinking agent widely used for the therapy of various cancers, challenging a common role for DSBs in the processing of DNA interstrand crosslinks. Here we report for the first time that cisplatin-mediated DSBs are induced in replicating but not quiescent cells of the yeast Saccharomyces cerevisiae. When the main pathway of repair of DSBs is inhibited, these breaks accumulate in replicating cells. Thus it appears that DNA interstrand crosslinks induced by different crosslinking agents, including cisplatin, are processed yielding DSBs as an intermediate lesion. In stationary cells, however, removal of DNA interstrand crosslinks after cisplatin treatment occurs without the formation of DSBs. These findings point to an altered mode of processing of cisplatin-DNA adducts in replicating versus quiescent cells.
ISSN:0300-483X
1879-3185
DOI:10.1016/j.tox.2005.04.015