Document Detail

Different susceptibilities of postmitotic checkpoint-proficient and -deficient Balb / 3T3 cells to ICRF-193, a catalytic inhibitor of DNA topoisomerase II.
MedLine Citation:
PMID:  11223549     Owner:  NLM     Status:  MEDLINE    
Two distinct types of Balb / 3T3 cells were isolated which exhibit either 4 N DNA or both 4 N and 8 N DNA after exposure to colcemid for 48 h. They were found to differ with respect to the postmitotic checkpoint, but not the mitotic checkpoint. Firstly, the checkpoint-proficient and -deficient cells exhibited the same accumulation and subsequent decrease in the number of mitotic cells following exposure to microtubule inhibitors. Secondly, after exit from abnormal mitosis in the presence of ICRF (Imperial Cancer Research Fund)-193, the checkpoint-proficient cells were arrested in the next cycle G1, while the checkpoint-deficient cells progressed into S and G2 phase. When either mitotic or asynchronous cells were exposed to ICRF-193, the checkpoint-proficient cells proved more sensitive to the cytotoxic effect of this agent than the checkpoint-deficient cells. The different susceptibilities of the two types of cells to ICRF-193 were not caused by variation in topoisomerase (topo) II function since both the biochemical activity of this enzyme and chromosome segregation were inhibited by similar concentrations of ICRF-193 in both checkpoint-proficient and -deficient cells. We propose that the inhibition of chromosome segregation by ICRF-193 is monitored by the next G1 checkpoint, resulting in an irreversible G1 block in the case of postmitotic checkpoint-proficient cells. As the checkpoint-deficient cells can escape this G1 block, these cells have an increased survival capacity. In summary, ICRF-193 may prove to be a very useful drug for examination of the postmitotic checkpoint.
K Nishida; M Seto; R Ishida
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Japanese journal of cancer research : Gann     Volume:  92     ISSN:  0910-5050     ISO Abbreviation:  Jpn. J. Cancer Res.     Publication Date:  2001 Feb 
Date Detail:
Created Date:  2001-03-06     Completed Date:  2001-05-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8509412     Medline TA:  Jpn J Cancer Res     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  193-202     Citation Subset:  IM    
Division of Molecular Medicine, Aichi Cancer Center Research Institute, Kanokoden, Chikusa-ku, Nagoya 464-8681, Japan.
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MeSH Terms
3T3 Cells
Camptothecin / analogs & derivatives*,  pharmacology
Cell Survival / drug effects
Chromosome Segregation / drug effects
DNA / analysis
DNA Topoisomerases, Type II / antagonists & inhibitors*
Enzyme Inhibitors / pharmacology*
Flow Cytometry
G1 Phase
Mitosis / drug effects*
Piperazines / pharmacology*
S Phase
Reg. No./Substance:
0/Enzyme Inhibitors; 0/Piperazines; 100286-90-6/irinotecan; 21416-68-2/ICRF 193; 7689-03-4/Camptothecin; 9007-49-2/DNA; EC Topoisomerases, Type II

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