箬叶多糖及其化学修饰物、亚硒酸钠和GSH对Cu^(2+)诱导的LDL氧化修饰的保护作用

Protective Effects of Ruoye Polysaccharide and Its Derivatives,Sodium Selenite and GSH on CopperDependent Oxidative ModifiedLow Density Lipoprotein

研究了箬叶多糖ＦⅢ－ａ及其化学修饰物、亚硒酸钠和ＧＳＨ对Ｃｕ２＋诱导的低密度脂蛋白氧化修饰的保护作用．其结果表明箬叶多糖、硫酸酯多糖、硒酸酯多糖可显著抑制脂质过氧化产物（ＴＢＡＲＳ）及荧光物质的生成，彼此之间无明显差异．但对ＶＥ的消耗有着不同的保护作用，其顺序是ＦⅢ－ａ＞Ｓ－ＦⅢ－ａ＞Ｓｅ－ＦⅢ－ａ，并且具有明显的量效关系．硒或ＧＳＨ对Ｃｕ２＋诱导的ＬＤＬ氧化修饰无明显的抑制，但联合使用在０．１２５ｍｍｏｌ／ＬＮａ２ＳｅＯ３和０．２ｍｍｏｌ／ＬＧＳＨ及１２．５μｍｏｌ／ＬＮａ２ＳｅＯ３和０．０２ｍｍｏｌ／ＬＧＳＨ的浓度下能强烈地抑制ＴＢＡＲＳ的生成，甚至比正常的ＬＤＬ还要低．但是对ＶＥ的消耗只有较弱的保护作用，硒酸酯多糖与此相似．Ｎａ２ＳｅＯ３在０．１２５ｍｍｏｌ／Ｌ时可以明显抑制荧光物质的生成．

The antioxidative activity of Ruoye polysaccharides prepared from Chinese traditional medicine Ruoye (Indocalamus tesselatus),a kind of bamboo leaves and their chemical modified derivatives were studied.Ruoye polysaccharides and their sulfate and selenate could markedly reduce the formation of lipid peroxides and fluorescence products in Cu2+ oxidative modified low density lipoprotein(LDL),but SeFⅢa had a weak inhibitory effect on vitamin E depletion,just like sodium selenite.Sodium selenite and glutathione treated alone did not prevent oxidation,while sodium seleniteglutathione addition with 0.125 mmol/L Na2SeO302 mmol/L GSH or 0.0125 mmol/L Na2SeO3002 mmol/L GSH,could completely inhibit the formation of lipid peroxides.