Journal article
Bleomycin-induced DNA damage and repair in human cells permeabilized with lysophosphatidylcholine
Cancer research (Chicago, Ill.), Vol.50(5), pp.1613-1619
03/01/1990
Handle:
https://hdl.handle.net/2376/112537
PMID: 1689213
Abstract
We have examined bleomycin-induced DNA damage and repair in confluent human fibroblasts that were reversibly permeabilized to small molecules (e.g., deoxynucleotide triphosphates and trypan blue) by a short exposure to 80 micrograms/ml lysophosphatidylcholine. We found that this treatment dramatically increases the dose effectiveness of bleomycin in inducing DNA strand breaks and DNA repair synthesis in these cells. For example, when intact cells (not treated with lysophosphatidylcholine) were incubated with 100 micrograms/ml bleomycin, only about 5% of the cell population was observed to have undergone measurable DNA repair synthesis (by autoradiography). On the other hand, when these cells were reversibly permeabilized with lysophosphatidylcholine before treatment, we observed significant repair synthesis in greater than 80% of the cells using a bleomycin dose of only 5 micrograms/ml. Furthermore, sufficient levels of single- and double-strand breaks were introduced into nucleosome linker DNA of permeabilized cells to yield a nucleosomal repeat pattern in alkaline and neutral agarose gels. However, no change in the amount of DNA less than 23 kilobases was observed on these gels when intact cells were incubated with bleomycin.
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Details
- Title
- Bleomycin-induced DNA damage and repair in human cells permeabilized with lysophosphatidylcholine
- Creators
- K Sidik - Biochemistry/Biophysics Program, Washington State University, Pullman 99164-4660M J Smerdon
- Publication Details
- Cancer research (Chicago, Ill.), Vol.50(5), pp.1613-1619
- Academic Unit
- Molecular Biosciences, School of
- Publisher
- United States
- Grant note
- ES02614 / NIEHS NIH HHS
- Identifiers
- 99900547849101842
- Language
- English
- Resource Type
- Journal article