硒螺旋藻对大鼠肝叶切除术后肝细胞再生和抗氧化能力的影响

目的研究硒螺旋藻（Se—SP）对大鼠肝叶切除术后肝细胞再生和抗氧化能力的影响，以印证其生物利用价值。方法用Wistar大鼠复制67％肝叶切除动物模型，设Se—SP高剂量（H）和低剂量（L）治疗组，术前以Se—SP灌胃7d；另设生理盐水（C）及假手术对照组（S）。于手术前及其后24h取鼠肝细胞，检测硒（Se）、丙二醛（MDA）含量及谷胱甘肽过氧化物酶（GPx）和超氧化物歧化酶（SOD）活性；利用免疫组化方法测定肝细胞增生核抗原（PCNA）表达指数，慧星实验检测过氧化氢诱导的肝细胞DNA损伤。结果与C，S组相比，H组、L组肝细胞中MDA水平明显降低（P〈0．05），而Se，GPx和SOD明显升高（P〈0．05）；肝细胞PCNA指数明显升高（P〈0．05），过氧化氢诱导的DNA损伤程度较轻。结论Se—SP对肝切除鼠肝细胞具有一定的抗氧化和促再生作用。

Effects of selenium enriched Spirulina platensis on antioxidation and regeneration of rat hepatocytes after hepatectomy

Objective To explore the effects of selenium enriched Spirulina platensis(Se-SP) on(antioxidation) and regeneration of rat hepatocytes after partial hepatectomy.Methods Sixty-seven percent(hepatectomy) was performed in rats after high dose(H) and low dose(L) Se-SP was given via gastric tube for 7 days.Then selenium(Se),glutathione peroxidase(GPx),superoxide dismutase(SOD) and(malondiaoldehyde)(MDA) in hepatocytes were determined.The results were compared with normal saline(giving) via gastric tube before hepatectomy(C) and sham operation(S) groups.Hepatocytes were obtained(before) operation and 24h after operation,and the expression index of proliferating cell nuclear antigen((PCNA)) in hepatocytes was detected by immunohistochemistry,and the DNA damage of hepatocytes induced by peroxide was analyzed by comet assay.Results After partial hepatectomy,Se content,GPx and SOD(activity),and PCNA expression index were obviously higher(P<0.05),whereas content of MDA was(significantly) lower(P<0.05) in hepatocytes of rats with high dose and low dose Se-SP(150mg/100/d) than those in control.The DNA oxidation damage in hepatocytes induced by peroxide(100 nM for 30 min) was decreased also in rats with high dose and low dose of Se-SP treatment.Conclusions Se-SP has definite antioxidation and regeneration enhancing effects on rat hepatocytes after hepatectomy.