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      저자 : Carlos-Alberto Gonc¸alves (검색결과 1 건)
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        Genoprotective Effects of the Green Tea-Derived Polyphenol/Epicatechin Gallate in C6 Astroglial

        Renata T. Abib,Andre´ Quincozes-Santos,Caroline Zanotto,Fares Zeida´n-Chulia,Paula S. Lunardi,Carlos-Alberto Gonc¸alves,Carmem Gottfried 한국식품영양과학회 2010 Journal of medicinal food Vol.13 No.5

        In vitro and in vivo studies have recently reported significant chemopreventive effects of green tea-derived polyphenols in different diseases. However, it remains unclear how such effects could be triggered. In order to elucidate the effects of epicatechin gallate (ECG) in C6 cells, both by itself and against H2O2-induced genotoxicity, measurements of DNA strand breaks and chromosome loss were performed. DNA damage was measured by comet and micronucleus assays. The present study shows for the first time how ECG, the major green tea-derived polyphenol, is able to exert dose-dependent genoprotective effects in an H2O2-induced toxicity model of C6 astroglial cells. We demonstrate that doses of ECG in a range from 0.1 to 1μM were able to completely prevent H2O2-induced genotoxicity in vitro. In contrast, considerably higher concentrations of ECG (10μM) were able to reverse previous positive effects in a dose- and time-dependent manner. The same results were confirmed by both comet (F3,9=336,148; P<.001) and micronucleus (F3,9=23,228; P<.001) methods. Together, our data show ECG as a dose-dependent genoprotective compound in C6 astroglial cells. This indicates that small doses of polyphenols included in our diet could have beneficial effects on neural cells, contributing to prevention of oxidative stress-associated brain pathologies. In addition, our data highlight the importance of strictly modulating doses and/or consumption of antioxidant-fortified foods or additional supplements containing such beneficial molecules.

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