Chinese hamster ovary cells deficient or proficient in O6-alkylguanine-DNA alkyltransferase activity are equally sensitive to X-rays

C. Pardini, A. Piras, M. Voliani, G. Rainaldi, L. Mariani, P. Taverna, M. D'Incalci, L. Citti

Research output: Contribution to journalArticlepeer-review

Abstract

In mammalian cells, under aerobic conditions, ionizing radiations and radiomimetic chemical agents can induce an enzymatic activity involved in DNA repair, O6-alkylguanine-DNA alkyltransferase (O6-AT). This catalytic protein is active against alkyl-radical-induced DNA damages. This induction was proposed to be linked to the formation of hydroxyl radicals. The possible involvement of O6-AT in the defense mechanism of the cell against aerobic radiation damage was investigated by comparing the X-ray sensitivity of two Chinese hamster ovary (CHO) cell lines, the first deficient (CHO mex-) and the second proficient by transfection of O6-AT (CHO mex+). The colony-forming ability after X-irradiation was appreciably reduced in CHO mex- in comparison to CHO mex+ cells. Nevertheless, pretreatment of proficient cells with O6-methylguanine, a specific inhibitor of O6-AT, reduced the DNA repair activity but did not modify the degree of sensitivity to X-rays of the CHO mex+ cells. Since the glutathione concentrations as well as the DNA damage amounts induced by X-irradiation were comparable in the variously treated cell lines, these results suggest that the observed induction of O6-AT by ionizing radiation in aerobic conditions could be a generalized rather than a specific response to damage by radicals.

Original languageEnglish
Pages (from-to)125-129
Number of pages5
JournalMutation Research Letters
Volume283
Issue number2
DOIs
Publication statusPublished - 1992

Keywords

  • CHO cells
  • O-Alkylguanine-DNA alkyltransferase
  • x-Ray sensivity

ASJC Scopus subject areas

  • Genetics
  • Toxicology

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