维生素C和E对染铅大鼠海马抗氧化酶及NO与NOS的影响

目的：观察维生素C、E对五周龄生长期染铅SD大鼠血铅及海马超氧化物歧化酶（SOD）、谷胱甘肽过氧化物酶（GSH—Px）、NOS活性及丙二醛（MDA）、NO含量的影响。方法：大鼠自由饮用0．615mmol／L的醋酸铅4周造成铅中毒模型。然后以维生素C100mg／kg、维生素E100mg／kg单独或联合灌胃1周。测量血铅水平，大鼠海马组织SOD、GSH—Px、NOS活性及MDA和NO含量。结果：与铅模型组比较，给予维生素C，维生素E后，大鼠血铅浓度显著性降低（P〈0．05）；MDA含量下降，且其联合治疗组与单独维生素C治疗组差异有显著性（P〈0．05）；SOD，GSH—Px、NO、NOS水平显著高于铅模型组，差异有显著性（P〈0．05）。结论：补充维生素C、维生素E可以降低血铅含量，减轻铅中毒引起的海马的脂质过氧化损伤，提高NOS、NO活性。

Effect of vitamin C and E on antioxidative enzyme,NOS activity and NO contents in hippocampus of rats with lead poisoning

OBJECTIVE: To observe the effect of vitamin C and E on blood lead (Pb) levels and SOD, GSH-Px, NOS activity and NO, MDA content in hippocampus of rats with lead poisoning. METHODS: Rat lead poisoning model was established by oral administration of 0.615 mmol/L lead acetate in drinking water for 4 weeks; and animals were fed with vitamin C 100 mg/kg. bw and/or vitamin E 100 mg/kg. bw for 1 week. Then blood Pb levels and SOD, GSH-Px, NOS activity and MDA, NO contents in hippocampus of rats were determined by corresponding kits. RESULT: Compared with control group, blood Pb level was decreased significantly (P<0.05) after given vitamin C, vitamin E or combination of vitamin C and E. The concentrations of SOD, GSH-Px, NO and NOS were significantly higher in vitamin C and/or E groups than those in control group (P<0.05). The concentration of MDA in vitamin treatment groups was significantly lower than that in lead control group (P<0.05); furthermore concentration of MDA in combination of vitamin C and E group was significantly higher than that in vitamin C alone group (P<0.05). CONCLUSION: Administration of vitamin C and E can decrease blood lead level, alleviate damage of lipid peroxidation in hippocampus by lead toxicity and reverse NO, NOS levels in rats with lead poisoning.