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Imidazopurinones are markers of physiological genomic damage linked to DNA instability and glyoxalase 1-associated tumour multidrug resistance
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Thornalley, Paul J., Waris, Sahar, Fleming, Thomas, Santarius, Thomas, Larkin, Sarah J., Winklhofer-Roob, Brigitte M., Stratton, Michael R. and Rabbani, Naila (2010) Imidazopurinones are markers of physiological genomic damage linked to DNA instability and glyoxalase 1-associated tumour multidrug resistance. Nucleic Acids Research, Vol.38 (No.16). pp. 5432-5442. doi:10.1093/nar/gkq306 ISSN 0305-1048.
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Official URL: http://dx.doi.org/10.1093/nar/gkq306
Abstract
Glyoxal and methylglyoxal are reactive dicarbonyl metabolites formed and metabolized in physiological systems. Increased exposure to these dicarbonyls is linked to mutagenesis and cytotoxicity and enhanced dicarbonyl metabolism by overexpression of glyoxalase 1 is linked to tumour multidrug resistance in cancer chemotherapy. We report herein that glycation of DNA by glyoxal and methylglyoxal produces a quantitatively important class of nucleotide adduct in physiological systems—imidazopurinones. The adduct derived from methylglyoxal-3-(2′-deoxyribosyl)-6,7-dihydro-6,7-dihydroxy-6/7-methylimidazo-[2,3-b]purine-9(8)one isomers—was the major quantitative adduct detected in mononuclear leukocytes in vivo and tumour cell lines in vitro. It was linked to frequency of DNA strand breaks and increased markedly during apoptosis induced by a cell permeable glyoxalase 1 inhibitor. Unexpectedly, the DNA content of methylglyoxal-derived imidazopurinone and oxidative marker 7,8-dihydro-8-oxo-2′-deoxyguanosine were increased moderately in glyoxalase 1-linked multidrug resistant tumour cell lines. Together these findings suggest that imidazopurinones are a major type of endogenous DNA damage and glyoxalase 1 overexpression in tumour cells strives to counter increased imidazopurinone formation in tumour cells likely linked to their high glycolytic activity.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QP Physiology R Medicine > RC Internal medicine > RC0254 Neoplasms. Tumors. Oncology (including Cancer) |
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Divisions: | Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School > Biomedical Sciences > Translational & Experimental Medicine > Metabolic and Vascular Health (- until July 2016) Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School |
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Library of Congress Subject Headings (LCSH): | DNA, Drug resistance in cancer cells, Multidrug resistance, Tumors | ||||
Journal or Publication Title: | Nucleic Acids Research | ||||
Publisher: | Oxford University Press | ||||
ISSN: | 0305-1048 | ||||
Official Date: | September 2010 | ||||
Dates: |
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Volume: | Vol.38 | ||||
Number: | No.16 | ||||
Page Range: | pp. 5432-5442 | ||||
DOI: | 10.1093/nar/gkq306 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Open Access (Creative Commons) |
Data sourced from Thomson Reuters' Web of Knowledge
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