目的观察绞股蓝皂苷(GP)对晚期糖基化终末产物(AGEs)诱导下人肾小球系膜细胞(HMCs)中晚期糖基化终末产物受体(RAGE)表达及氧化应激水平的影响。方法用含13%FBS的DMEM低糖培养液体外培养HMCs细胞,将细胞分为6组:对照组(DMEM培养液),AGEs...目的观察绞股蓝皂苷(GP)对晚期糖基化终末产物(AGEs)诱导下人肾小球系膜细胞(HMCs)中晚期糖基化终末产物受体(RAGE)表达及氧化应激水平的影响。方法用含13%FBS的DMEM低糖培养液体外培养HMCs细胞,将细胞分为6组:对照组(DMEM培养液),AGEs组(200 mg/L),GP低、中、高剂量(25、75、150 mg/L)组和阳性对照组(氨基胍0.1 mmol/L)。培养72 h后,采用实时荧光定量PCR法检测各组细胞中RAGE m RNA的表达水平,Western blotting法检测RAGE蛋白表达水平。应用试剂盒检测各组细胞上清液中超氧化物歧化酶(SOD)、丙二醛(MDA)及细胞内微量还原型谷胱甘肽(GSH)活性。结果 AGEs显著促进HMCs中RAGE m RNA及蛋白表达(P<0.01),增强细胞氧化应激水平。GP能有效抑制RAGE m RNA及蛋白表达,增加上清液中SOD和细胞内GSH水平,降低细胞上清液中MDA水平,且呈浓度依赖效应,与AGEs组比较差异显著(P<0.01)。结论 GP下调AGEs刺激后HMCs细胞RAGE的异常高表达,同时改善细胞内氧化应激水平,其可能的机制是GP阻断了RAGE介导的AGEs-RAGE-氧化应激信号通路,表现为细胞上清液中MDA水平降低和SOD水平增加及细胞内GSH水平增加。展开更多
Advanced glycation end products lead to cell apoptosis, and cause cell death by increasing endoplasmic reticulum stress. Advanced glycation end products alone may also directly cause damage to tissues and cells, but t...Advanced glycation end products lead to cell apoptosis, and cause cell death by increasing endoplasmic reticulum stress. Advanced glycation end products alone may also directly cause damage to tissues and cells, but the precise mechanism remains unknown. This study used primary cultures of rat cerebral cortex neurons, and treated cells with different concentrations of glycation end products （50, 100, 200, 400 mg/L）, and with an antibody for the receptor of advanced glycation end products before and after treatment with advanced glycation end products. The results showed that with increasing concentrations of glycation end products, free radical content increased in neurons, and the number of apoptotic cells increased in a dose-dependent manner. Before and after treatment of advanced glycation end products, the addition of the antibody against advanced glycation end-products markedly reduced hydroxyl free radicals, malondialdehyde levels, and inhibited cell apoptosis. This result indicated that the antibody for receptor of advanced glycation end-products in neurons from the rat cerebral cortex can reduce glycation end product-induced oxidative stress damage by suppressing glycation end product receptors. Overall, our study confirms that the advanced glycation end products-advanced glycation end products receptor pathway may be the main signaling pathway leading to neuronal damage.展开更多
文摘目的观察绞股蓝皂苷(GP)对晚期糖基化终末产物(AGEs)诱导下人肾小球系膜细胞(HMCs)中晚期糖基化终末产物受体(RAGE)表达及氧化应激水平的影响。方法用含13%FBS的DMEM低糖培养液体外培养HMCs细胞,将细胞分为6组:对照组(DMEM培养液),AGEs组(200 mg/L),GP低、中、高剂量(25、75、150 mg/L)组和阳性对照组(氨基胍0.1 mmol/L)。培养72 h后,采用实时荧光定量PCR法检测各组细胞中RAGE m RNA的表达水平,Western blotting法检测RAGE蛋白表达水平。应用试剂盒检测各组细胞上清液中超氧化物歧化酶(SOD)、丙二醛(MDA)及细胞内微量还原型谷胱甘肽(GSH)活性。结果 AGEs显著促进HMCs中RAGE m RNA及蛋白表达(P<0.01),增强细胞氧化应激水平。GP能有效抑制RAGE m RNA及蛋白表达,增加上清液中SOD和细胞内GSH水平,降低细胞上清液中MDA水平,且呈浓度依赖效应,与AGEs组比较差异显著(P<0.01)。结论 GP下调AGEs刺激后HMCs细胞RAGE的异常高表达,同时改善细胞内氧化应激水平,其可能的机制是GP阻断了RAGE介导的AGEs-RAGE-氧化应激信号通路,表现为细胞上清液中MDA水平降低和SOD水平增加及细胞内GSH水平增加。
文摘Advanced glycation end products lead to cell apoptosis, and cause cell death by increasing endoplasmic reticulum stress. Advanced glycation end products alone may also directly cause damage to tissues and cells, but the precise mechanism remains unknown. This study used primary cultures of rat cerebral cortex neurons, and treated cells with different concentrations of glycation end products （50, 100, 200, 400 mg/L）, and with an antibody for the receptor of advanced glycation end products before and after treatment with advanced glycation end products. The results showed that with increasing concentrations of glycation end products, free radical content increased in neurons, and the number of apoptotic cells increased in a dose-dependent manner. Before and after treatment of advanced glycation end products, the addition of the antibody against advanced glycation end-products markedly reduced hydroxyl free radicals, malondialdehyde levels, and inhibited cell apoptosis. This result indicated that the antibody for receptor of advanced glycation end-products in neurons from the rat cerebral cortex can reduce glycation end product-induced oxidative stress damage by suppressing glycation end product receptors. Overall, our study confirms that the advanced glycation end products-advanced glycation end products receptor pathway may be the main signaling pathway leading to neuronal damage.
