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Tolerance to O6-Methylguanine and 6-Thioguanine Cytotoxic Effects: A Cross-resistant Phenotype in N-Methylnitrosourea-resistant Chinese Hamster Ovary Cells

Gabriele Aquilina, Anna Maria Giammarioli, Andrea Zijno, Alfonso Di Muccio, Eugenia Dogliotti and Margherita Bignami
Gabriele Aquilina
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Anna Maria Giammarioli
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Andrea Zijno
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Alfonso Di Muccio
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Eugenia Dogliotti
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Margherita Bignami
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DOI:  Published July 1990
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Abstract

The biochemical and genetic characteristics of a clone of Chinese hamster ovary cells displaying resistance to N-methyl-N-nitrosourea (MNU) and 6-thioguanine (6-TG) were analyzed. The initial level of 7-methylguanine, 3-methyladenine, and O6-methylguanine formation and the repair rates for these alkylated bases were the same in the resistant and in the parental cell line, indicating that the resistance to alkylation damage is not due to differences in DNA alkylation. After exposure for 24 or 48 h to 6-TG (0.6 µg/ml) in culture medium, the resistant clone incorporated 1.6-fold more 6-TG into DNA than the parental cells and, in contrast to them, was able to replicate the DNA containing the base analogue during the following 24 h. These data are in agreement with the hypothesis that resistant cells tolerate both O6-methylguanine and 6-TG present in DNA. The tolerance to MNU and 6-TG also included chromosomal damage induced by these two agents, and MNU-resistant cells incurred less sister chromatid exchanges after treatment with either MNU or 6-TG. 6-TG-resistant cells, selected by growth in 6-TG, exhibited cross-resistance to MNU but not to methyl methanesulfonate, confirming that a common pathway of tolerance is responsible for resistance to 6-TG and O6-methylguanine.

Footnotes

  • ↵1 This work has been supported by an EEC grant [Contract EV4V00441(A)] and Consiglio Nazionale delle Richerche (Progetto Strategico Mutagenesi).

  • ↵2 To whom requests for reprints should be addressed.

  • Received November 28, 1989.
  • Revision received March 26, 1990.
  • ©1990 American Association for Cancer Research.
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July 1990
Volume 50, Issue 14
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Tolerance to O6-Methylguanine and 6-Thioguanine Cytotoxic Effects: A Cross-resistant Phenotype in N-Methylnitrosourea-resistant Chinese Hamster Ovary Cells
Gabriele Aquilina, Anna Maria Giammarioli, Andrea Zijno, Alfonso Di Muccio, Eugenia Dogliotti and Margherita Bignami
Cancer Res July 15 1990 (50) (14) 4248-4253;

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Tolerance to O6-Methylguanine and 6-Thioguanine Cytotoxic Effects: A Cross-resistant Phenotype in N-Methylnitrosourea-resistant Chinese Hamster Ovary Cells
Gabriele Aquilina, Anna Maria Giammarioli, Andrea Zijno, Alfonso Di Muccio, Eugenia Dogliotti and Margherita Bignami
Cancer Res July 15 1990 (50) (14) 4248-4253;
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Cancer Research Online ISSN: 1538-7445
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