Dependence of fluorodeoxyuridine-induced cytotoxicity and megabase DNA fragment formation on S phase progression in HT29 cells

Cancer Chemotherapy and Pharmacology
H Y TangJ Maybaum

Abstract

The relationship between cell cycle progression and induction of DNA double-strand breaks and cytotoxicity by exposure to fluorodeoxyuridine (FdUrd) was studied in HT29 human colon cancer cells. Fractionation of drug-treated populations by centrifugal elutriation yielded subpopulations having widely divergent abilities to progress through S phase in the presence of the drug. One of these subpopulations, which appeared to undergo coordinated growth arrest, was resistant to FdUrd cytotoxicity and DNA damage. In contrast, the subpopulation which was able to progress furthest through S phase in the presence of FdUrd underwent unbalanced growth arrest (i.e., increase in size and mass out of proportion to DNA synthesis), and displayed both DNA double-strand break formation (assayed by pulsed field gel electrophoresis) and loss of clonogenicity. When cells were elutriated prior to drug treatment, producing fractions enriched in cells at various cell cycle stages, no significant differences in sensitivity to FdUrd-induced cytotoxicity were detected among elutriation fractions. These findings support the model that, in HT29 cells, progression into and through S phase during drug treatment is an important determinant of FdUrd-induced DNA...Continue Reading

References

Jan 1, 1979·The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society·C B BagwellG L Irvin
Nov 1, 1992·Proceedings of the National Academy of Sciences of the United States of America·C E CanmanJ Maybaum
Oct 1, 1990·Proceedings of the National Academy of Sciences of the United States of America·N R RodriguesD P Lane
Jan 1, 1986·Advances in Experimental Medicine and Biology·M GoulianB Y Tseng
Feb 1, 1981·Proceedings of the National Academy of Sciences of the United States of America·W D SedwickO E Brown
Jan 18, 1995·Journal of the National Cancer Institute·K S YaoP J O'Dwyer
Dec 16, 1994·Science·L H Hartwell, M B Kastan

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Citations

Jul 13, 2002·International Journal of Cancer. Journal International Du Cancer·George G ChenAlbert K K Chui
Nov 22, 2005·Journal of Molecular Biology·Elena A Kouzminova, Andrei Kuzminov

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