Metal-mediated DNA damage induced by diabetogenic alloxan in the presence of NADH.
Alloxan is known to induce diabetes in experimental animals through destruction of insulin-producing 3-cells of pancreas. The mechanism of DNA damage induced by alloxan was investigated using 32P-labeled human DNA fragments. Cu(II)-dependent DNA damage increased with the concentration of alloxan and NADH. Alloxan induced DNA cleavage frequently at thymine and cytosine residues in the presence of NADH and Cu(II). Catalase and bathocuproine, a Cu(I)-specific chelator, almost completely inhibited DNA damage, suggesting the involvement of H2O2 and Cu(I). Alloxan induced Cu(II)-dependent production of 8-oxodG in calf thymus DNA in the presence of NADH. UV-visible and electron spin resonance (ESR) spectroscopic studies showed that superoxide anion radical and alloxan radical were generated by the reduction of alloxan by NADH, and also by the autoxidation of dialuric acid, the reduced form of alloxan. These results suggest that the copper-oxygen complex derived from the reaction of H2O2 with Cu(I) participates in Cu(II)-dependent DNA damage by alloxan plus NADH and dialuric acid. The mechanism of DNA damage is discussed in relation to diabetogenic action of alloxan.
Murata
M
M
Department of Hygiene, Mie University School of Medicine, Tsu, Japan.
Imada
M
M
Inoue
S
S
Kawanishi
S
S
D000080242:8-Hydroxy-2'-Deoxyguanosine; D000496:Alloxan / Q000494:pharmacology*; D000818:Animals; D001463:Barbiturates / Q000494:pharmacology; D002374:Catalase / Q000494:pharmacology; D002417:Cattle; D002614:Chelating Agents / Q000494:pharmacology; D003300:Copper / Q000494:pharmacology*; D003596:Cytosine / Q000378:metabolism; D004247:DNA / Q000187:drug effects / Q000378:metabolism; D004249:DNA Damage / Q000187:drug effects*; D003849:Deoxyguanosine / Q000031:analogs & derivatives / Q000378:metabolism; D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals; D006801:Humans; D009243:NAD / Q000494:pharmacology*; D010618:Phenanthrolines / Q000494:pharmacology; D013056:Spectrophotometry, Ultraviolet; D013481:Superoxides / Q000378:metabolism; D013941:Thymine / Q000378:metabolism
D001463:Barbiturates; D002614:Chelating Agents; D005609:Free Radicals; D010618:Phenanthrolines; D009243:NAD; D013481:Superoxides; C004718:dialuric acid; D000496:Alloxan; D003300:Copper; D000080242:8-Hydroxy-2'-Deoxyguanosine; D003596:Cytosine; D004247:DNA; C002478:bathocuproine; D002374:Catalase; D003849:Deoxyguanosine; D013941:Thymine