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Unscheduled DNA synthesis related to transformation grade of human urothelial cells.

Unscheduled DNA synthesis (UDS) was studied by quantitative autoradiography in human urothelial cells of three transformation grades (TGr I-III). Cells incubated in arginine-free medium supplemented with hydroxyurea showed dose-dependent UDS after administration of agents injurious to DNA, while the scheduled synthesis of DNA was nearly totally suppressed. UDS was demonstrated after treatment with the ultimate carcinogen N-methyl-N-nitroso-N'-nitroguanidine ( CAS: 70-25-7) or with the procarcinogen 4-nitroquinoline-1-oxide (4-NQO; CAS: 56-57-5). In cultures treated with benzo[a]pyrene ( CAS: 50-32-8), which requires a different activation system than that for 4-NQO, UDS was less pronounced. In 9 cell lines the average rates of UDS were inversely related to TGr. Two cell lines showed a different pattern.[1]

References

  1. Unscheduled DNA synthesis related to transformation grade of human urothelial cells. Bem, W.T., Christensen, B., Kieler, J. J. Natl. Cancer Inst. (1987) [Pubmed]
 
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