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Detection of carcinogen-induced DNA breaks by nick translation in permeable cells

Authors
Journal
Biochemical and Biophysical Research Communications
0006-291X
Publisher
Elsevier
Publication Date
Volume
111
Issue
2
Identifiers
DOI: 10.1016/0006-291x(83)90317-0
Disciplines
  • Chemistry

Abstract

Abstract A nick-translation reaction with E. coli DNA polymerase I (pol. I) was used to detect in situ DNA breaks produced by chemical carcinogens. Normal human fibroblasts treated with N-methyl-N′-nitro-N-nitrosoguanidine (MNNG) in various doses were permeabilized with lysolecithin, and were nick translated in the presence of [ 3H]dCTP and pol. I. The radioactivity incorporated increased with MNNG concentration, and was directly proportional to the poly(ADP-ribose) synthetase activity. Other DNA-damaging agents such as bleomycin or 4-nitroquinoline 1-oxide also caused the nick translation rate to increase. When MNNG-treated cells were cultured in fresh medium containing no MNNG, the increase in the rate of nick translation in permeable cells became less and this decrease was abolished by addition of aphidicolin or cytosine arabinoside. The nick translation method described here may be a useful means for estimating intrinsic DNA breaks in cells treated with carcinogens.

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