✦ LIBER ✦

The effect of bleomycin on DNA synthesis in ataxia telangiectasia lymphoid cells

✍ Scribed by Cohen, Maimon M. ;Simpson, Stacy J.

Publisher: Wiley (John Wiley & Sons)
Year: 1982
Weight: 567 KB
Volume: 4
Category: Article
ISSN: 0192-2521
DOI: 10.1002/em.2860040105

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✦ Synopsis

Abstract

Bleomycin, a radiomimetic glycopeptide, inhibits de novo DNA synthesis in ataxia telangiectasia lymphoblastoid B cells to a markedly lesser extent than in normal and xeroderma pigmentosum lymphoid cells. This observaton is similar to that following ionizing radiation; however, the effect is slower following the chemical treatment. Recovery of the normal cells occurs 15–18 hours after treatment, whereas the ataxia telangiectasia lines do not attain normal levels of DNA synthesis during the entire 24‐hour observation period. Similar differences were not observed following treatment with mitomycin C, a bifunctional alkylating agent, indicating a specific effect of bleomycin on DNA synthesis in ataxia telangiectasia cells. Following bleomycin treatment and preincubation with hydroxyurea, residual DNA synthesis in ataxia telangiectasia cells was similar to that in both normal and xeroderma pigmentosum lymphoid lines, suggesting that the capacity to repair the induced DNA lesion is present.

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