To investigate the effect of phenolics in mulberry leaves (mulberry leaf phenolics; MLP) on hyperglycemia-induced oxidative stress and mitochondrial membrane potential (ΔΨm) in HepG2 cells; we treated HepG2 with glucose [5.5 (N-Glc) or 50 mmol/L (Hi-Glc)] with or without MLP at 10 or 100 µmol/L gallic acid equivalents and assessed level of reactive oxidant species (ROS), ΔΨm, malondialdehyde (MDA) and nuclear factor-kappaB (NF-κB) activation. Hi-Glc-induced oxidative damage was demonstrated by a series of increase in superoxides (560%, 0.5 h), MDA (400%, 24 h), NF-κB activation (474%, 4 h) and a wild fluctuation of ΔΨm relative to the control cells (p ≤ 0.05). MLP treatments ameliorate Hi-Glc-induced negative effects by a 40% reduction in ROS production, 34-44% reduction in MDA production, over 35% inhibition of NF-κB activation, as well as exert protective effect on HepG2 cells from change in ΔΨm. Our data show that MLP in vitro can protect hepatoctyes from hyperglycemia-induced oxidative damages.

译文

探讨桑叶酚类物质 (mulberry leaf phenolics; MLP) 对高血糖诱导的HepG2细胞氧化应激和线粒体膜电位 (Δ Ψ m) 的影响; 我们用葡萄糖 [5.5 (N-Glc) 或50 mmol/L (Hi-Glc)] 处理HepG2,含或不含10或100 µµ mol/L没食子酸当量的MLP,并评估反应性氧化剂 (ROS),Δ Ψ m,丙二醛 (MDA) 和核因子-κ b (NF-κ b) 激活。Hi-Glc诱导的氧化损伤通过一系列超氧化物 (560%,0.5  h) 、MDA (400%,24  h) 、NF-κ b活化 (474%,4  h) 和相对于对照细胞的 Δ Ψ m的野生波动 (p  ≤   0.05) 来证明。MLP处理通过40% 减少ROS产生,34-44% 减少MDA产生,35% 抑制NF-κ b活化来改善Hi-Glc诱导的负面作用,以及对HepG2细胞的保护作用,使其免受 Δ Ψ m的变化。我们的数据表明,体外MLP可以保护肝细胞免受高血糖引起的氧化损伤。

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