Anthocyanin-rich blackberry extract suppresses the DNA-damaging properties of topoisomerase I and II poisons in colon carcinoma cells
| Autor: | Doris Marko, Melanie Hutter, Ute Boettler, S. Skrbek, Simone Bächler, Nicole Teller, Melanie Esselen, Corinna E. Rüfer |
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| Rok vydání: | 2011 |
| Předmět: |
DNA damage
Topoisomerase Inhibitors Cyanidin Biology Protocatechuic acid Anthocyanins chemistry.chemical_compound Glucosides medicine Humans Topoisomerase II Inhibitors Hydrogen peroxide Rosaceae Plant Extracts Topoisomerase General Chemistry DNA Topoisomerases Type II chemistry Biochemistry DNA Topoisomerases Type I Catalase Anthocyanin Fruit biology.protein Topoisomerase I Inhibitors General Agricultural and Biological Sciences HT29 Cells Camptothecin medicine.drug DNA Damage |
| Zdroj: | Journal of agricultural and food chemistry. 59(13) |
| ISSN: | 1520-5118 |
| Popis: | In the present study, we addressed the question whether cyanidin-3-glucoside (C3G) or complex C3G-rich blackberry extracts affect human topoisomerases with special emphasis on the contribution of the potential degradation products phloroglucinol aldehyde (PGA) and protocatechuic acid (PCA). In HT29 colon carcinoma cells a C3G-rich blackberry extract suppressed camptothecin- (CPT-) or doxorubicin- (DOX-) induced stabilization of the covalent DNA-topoisomerase intermediate, thus antagonizing the effects of these classical topoisomerase poisons on DNA integrity. As a single compound, C3G (100 μM) decreased the DNA-damaging effects of CPT as well, but did not significantly affect those induced by DOX. At the highest applied concentration (100 μM), cyanidin protected DNA from CPT- and DOX-induced damage. Earlier reports on DNA-damaging properties of cyanidin were found to result most likely from the formation of hydrogen peroxide as an artifact in the cell culture medium when the incubation was performed in the absence of catalase. The suppression of hydrogen peroxide accumulation, achieved by the addition of catalase, demonstrated that cyanidin does not exhibit DNA-damaging properties in HT29 cells (up to 100 μM). The observed effects on topoisomerase interference and DNA protection against CPT or DOX were clearly limited to the parent compound and were not observed for the potential cyanidin degradation products PGA and PCA. |
| Databáze: | OpenAIRE |
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