| Application of the biotin-dUTP chromosome labelling technique to study the role of 5-bromo-2'-deoxyuridine in the formation of UV-induced sister chromatid exchanges in CHO cells. | |
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MedLine Citation:
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PMID: 12633986 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The role of 5-bromo-2'-deoxyuridine (BrdU) in the formation of sister chromatid exchanges (SCEs) in cells exposed to UV radiation was studied. Cells were unifilarily labelled (labelling of one strand of chromosomal DNA) with BrdU or biotin-16-2'-deoxyuridine (biotin-dU) and irradiated in G(1) phase of the cell cycle either with 254 nm, which is absorbed by all nucleobases including bromouracil (BrU) or with 313 nm radiation, which is predominantly absorbed by the BrU moiety. Elevated SCE frequencies were observed in cells irradiated at 254 nm (1.2 and 3.0 J m(-2)) which were pre-labelled with BrdU or biotin-dU. Following irradiation at 313 nm (38 and 96 J m(-2)) a statistically elevated SCE frequency was observed in cells pre-labelled with BrdU but not with biotin-dU. In cells pre-labelled with BrdU, UV-radiation at 254 nm was 50-80 times more effective in inducing SCEs than that at 313 nm. This result can be accounted for by the fact that in BrdU-DNA the cross-section for uracilyl radical and bromine atom formation is approximately 100-fold higher at 254 nm than that at 313 nm. Upon irradiation at 254 nm, BrdU had a strong sensitising effect on SCE induction: the SCE frequencies observed in cells pre-labelled with BrdU are approximately 6 times higher than in cells pre-labelled with biotin-dU. From this it follows that BrdU-induced damage is responsible for more than 80% of the SCEs formed in UV irradiated cells unifilarily labelled with BrdU. Based on photochemical considerations and the fact that chemical agents which form DNA interstrand cross-links are among the most potent inducers of SCEs, we propose that an interstrand cross-link may be the major lesion leading to SCEs in BrdU-labelled cells. |
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Authors:
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Andrzej Wojcik; Clemens von Sonntag; Günter Obe |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Journal of photochemistry and photobiology. B, Biology Volume: 69 ISSN: 1011-1344 ISO Abbreviation: J. Photochem. Photobiol. B, Biol. Publication Date: 2003 Feb |
Date Detail:
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Created Date: 2003-03-13 Completed Date: 2003-10-23 Revised Date: 2007-07-23 |
Medline Journal Info:
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Nlm Unique ID: 8804966 Medline TA: J Photochem Photobiol B Country: Switzerland |
Other Details:
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Languages: eng Pagination: 139-44 Citation Subset: IM |
Copyright Information:
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Copyright 2002 Elsevier Science B.V. |
Affiliation:
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Institute of Nuclear Chemistry and Technology, 03-195 Warszawa, Poland. guenter.obe@uni-essen.de |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Biotin / analogs & derivatives* Bromodeoxyuridine CHO Cells / metabolism*, pathology, radiation effects* Cricetinae Deoxyuracil Nucleotides Dideoxynucleosides / metabolism* Dose-Response Relationship, Radiation Microscopy, Fluorescence / methods Photosensitizing Agents / metabolism Sister Chromatid Exchange / radiation effects* Staining and Labeling / methods Ultraviolet Rays* |
| Chemical | |
Reg. No./Substance:
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0/Deoxyuracil Nucleotides; 0/Dideoxynucleosides; 0/Photosensitizing Agents; 0/biotin-16-dUTP; 28616-93-5/5-bromo-2',3'-dideoxyuridine; 58-85-5/Biotin; 59-14-3/Bromodeoxyuridine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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