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Titolo:
DNA oxidatively damaged by chromium(III) and H2O2 is protected by the antioxidants melatonin, N-1-acetyl-N-2-formyl-5-methoxykynuramine, resveratrol and uric acid
Autore:
Burkhardt, S; Reiter, RJ; Tan, DX; Hardeland, R; Cabrera, J; Karbownik, M;
Indirizzi:
Univ Texas, Hlth Sci Ctr, Dept Cellular & Struct Biol, San Antonio, TX 78229 USA Univ Texas San Antonio TX USA 78229 truct Biol, San Antonio, TX 78229 USA Univ Gottingen, Inst Zool & Anthropol, D-37073 Gottingen, Germany Univ Gottingen Gottingen Germany D-37073 pol, D-37073 Gottingen, Germany
Titolo Testata:
INTERNATIONAL JOURNAL OF BIOCHEMISTRY & CELL BIOLOGY
fascicolo: 8, volume: 33, anno: 2001,
pagine: 775 - 783
SICI:
1357-2725(200108)33:8<775:DODBCA>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYDROGEN-PEROXIDE; FREE-RADICALS; CARCINOGENESIS; GENOTOXICITY; STRESS; KIDNEY; GRAPES;
Keywords:
melatonin; chromium; 8-hydroxydeoxyguanosine; free radical scavenger; cancer;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Reiter, RJ Univ Texas, Hlth Sci Ctr, Dept Cellular & Struct Biol, 7703 Floyd Curl Dr,Mail Code 7762, San Antonio, TX 78229 USA Univ Texas 7703 Floyd Curl Dr,Mail Code 7762 San Antonio TX USA 78229
Citazione:
S. Burkhardt et al., "DNA oxidatively damaged by chromium(III) and H2O2 is protected by the antioxidants melatonin, N-1-acetyl-N-2-formyl-5-methoxykynuramine, resveratrol and uric acid", INT J BIO C, 33(8), 2001, pp. 775-783

Abstract

Chromium (Cr) compounds are widely used industrial chemicals and well known carcinogens. Cr(III) was earlier found to induce oxidative damage as documented by examining the levels of 8-hydroxydeoxyguanosine (8-OH-dG), an index for DNA damage, in isolated calf thymus DNA incubated with CrCl3 and H2O,. In the present in vitro study, we compared the ability of the free radical scavengers melatonin, N-1-acetyl-N-2-formyl-5-methoxykynuramine (AFMK), resveratrol and uric acid to reduce DNA damage induced by Cr(III). Each of these scavengers markedly reduced the DNA damage in a concentration-dependent manner. The concentrations that reduced 8-OH-dG formation by 50% (IC50) were 0.10 muM for both resveratrol and melatonin, and 0.27 muM for AFMK. However, the efficacy of the fourth endogenous antioxidant, i.e. uric acid, in terms of its inhibition of DNA damage in the same in vitro system was about 60-150 times less effective than the other scavengers; the IC50 for uricacid was 15.24 muM. These findings suggest that three of the four antioxidants tested in these studies may have utility in protecting against the environmental pollutant Cr and that the protective effects of these free radical scavengers against Cr(III)-induced carcinogenesis may relate to their direct hydroxyl radical scavenging ability. In the present study, the formation of 8-OH-dG was likely due to a Cr(III)-mediated Fenton-type reaction that generates hydroxyl radicals, which in turn damage DNA. Once formed, 8-OH-dG can mutate eventually leading to cancer; thus the implication is that these antioxidants may reduce the incidence of Cr-related cancers. (C) 2001 Published by Elsevier Science Ltd.

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Documento generato il 04/06/20 alle ore 00:52:14