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• W4386826420 endingPage "503694" @default.
• W4386826420 startingPage "503694" @default.
• W4386826420 abstract "Myricetin (MYR), found in tea and berries, may have preventive effects on diseases, including Alzheimer's disease and cancer. However, MYR is also a mutagen, inducing DNA damage in the presence of metal ions. We have studied the molecular mechanisms of DNA damage by MYR in the presence of Cu(II) (MYR+Cu). Using 32P-5'-end-labeled DNA fragments, we analyzed site-specific DNA damage caused by MYR+Cu. MYR+Cu caused concentration-dependent DNA strand breaks and base alterations, leading to cleavage of DNA at thymine, cytosine, and guanine nucleotides. Formation of the oxidative DNA damage indicator, 8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG), in calf thymus DNA was increased by MYR+Cu. The production of 8-oxodG in MYR-treated HL-60 cells was significantly higher than in HP100 cells, which are more resistant to H2O2 than are HL-60 cells. Reactive oxygen species (ROS) scavengers were used to elucidate the mechanism of DNA damage. DNA damage was not inhibited by typical free hydroxyl radical (•OH) scavengers such as ethanol, mannitol, or sodium formate. However, methional, catalase, and bathocuproine inhibited DNA damage induced by MYR+Cu. These results suggest that H2O2, Cu(I), and ROS other than •OH are involved in MYR+Cu-induced DNA damage. We conclude that the Cu(I)/Cu(II) redox cycle and concomitant H2O2 production via autoxidation of MYR generate a complex of H2O2 and Cu(I), probably Cu(I)-hydroperoxide, which induces oxidative DNA damage." @default.
• W4386826420 created "2023-09-19" @default.
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• W4386826420 date "2023-10-01" @default.
• W4386826420 modified "2023-10-17" @default.
• W4386826420 title "Myricetin causes site-specific DNA damage via reactive oxygen species generation by redox interactions with copper ions" @default.
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• W4386826420 doi "https://doi.org/10.1016/j.mrgentox.2023.503694" @default.
• W4386826420 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37770136" @default.
• W4386826420 hasPublicationYear "2023" @default.
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