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Black soybean seed coat polyphenols prevent AAPH-induced oxidative DNA-damage in HepG2 cells

机译:黑大豆种皮多酚可防止AAPH诱导的HepG2细胞DNA氧化损伤

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摘要

Black soybean seed coat extract (BE), which contains abundant polyphenols such as procyanidins, cyanidin 3-glucoside, (+)-catechin, and (−)­epicatechin, has been reported on health beneficial functions such as antioxidant activity, anti-inflammatory, anti-obesity, and anti-diabetic activities. In this study, we investigated that prevention of BE and its polyphenols on 2,2'-azobis(2-methylpropionamide) dihydrochloride (AAPH)-induced oxidative DNA damage, and found that these polyphenols inhibited AAPH-induced formation of 8-hydroxy-2'-deoxyguanosine (8-OHdG) as a biomarker for oxidative DNA damage in HepG2 cells. Under the same conditions, these polyphenols also inhibited AAPH-induced accumulation of reactive oxygen species (ROS) in the cells. Inhibition of ROS accumulation was observed in both cytosol and nucleus. It was confirmed that these polyphenols inhibited formation of AAPH radical using oxygen radical absorbance capacity assay under the cell-free conditions. These results indicate that polyphenols in BE inhibit free radical-induced oxidative DNA damages by their potent antioxidant activity. Thus, BE is an effective food material for prevention of oxidative stress and oxidative DNA damages.
机译:据报道,黑大豆种皮提取物(BE)含有丰富的多酚,例如原花青素,花青素3-葡糖苷,(+)-儿茶素和(-)表儿茶素,对健康有益,例如抗氧化活性,消炎,抗肥胖和抗糖尿病活动。在这项研究中,我们研究了BE及其多酚对2,2'-偶氮双(2-甲基丙酰胺)二盐酸盐(AAPH)引起的氧化DNA损伤的预防作用,并发现这些多酚可抑制AAPH诱导的8-羟基-羟基苯甲酸的形成。 2'-脱氧鸟苷(8-OHdG)作为HepG2细胞中DNA氧化损伤的生物标记。在相同条件下,这些多酚还抑制AAPH诱导的细胞中活性氧(ROS)的积累。在细胞质和细胞核中均观察到了ROS的抑制作用。在无细胞条件下使用氧自由基吸收能力测定法证实了这些多酚抑制了AAPH自由基的形成。这些结果表明BE中的多酚通过其有效的抗氧化活性抑制了自由基诱导的氧化DNA损伤。因此,BE是预防氧化应激和DNA氧化损伤的有效食品。

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