甘糖酯对大鼠肝脏CuZn-SOD mRNA表达和酶活的诱导作用

目的探讨甘糖酯对大鼠肝脏CuZn-SOD的诱导作用。方法RT-PCR法检测甘糖酯po后的Wistar大鼠肝脏中CuZn-SOD mRNA的表达情况;亚硝酸盐法测定肝组织中CuZn-SOD酶活。结果po甘糖酯后,高剂量组大鼠肝组织的SOD mRNA水平与对照组相比有显著的差异(P<0.01);高剂量组大鼠肝组织CuZn-SOD活力与对照组相比有非常显著的差异(P<0.001),而中剂量组和低剂量组CuZn-SOD活力与对照组相比有显著的差异(P<0.01)。结论甘糖酯能够诱导大鼠肝组织中CuZn-SOD mRNA的表达,并提高其酶活,而且其作用随剂量的增加而提高。

INDUCTION OF CuZn-SOD mRNA EXPRESSION AND ACTIVITY BY PGMS IN RAT LIVER

AIM: To study the effect of propylene glycol mannate sulfate (PGMS) on induction of CuZn-SOD. METHODS: Wistar rats were given PGMS p.o. at different doses (0, 18.9, 37.8 and 75.6 mg.kg-1.d) for ten days. Then the rats were sacrificed and the total RNA was extracted from the livers. The total RNA samples were loaded on a 1% agarose gel to detect the quality of total RNA. RT-PCR was applied to study the expression of CuZn-SOD mRNA in rat livers. The amplified products were detected by the 1.5% agarose gel electrophoresis. Simultaneously, the CuZn-SOD activities in rat liver were determined by nitrite method. RESULTS: The total RNA extracted from rat livers was integrated without being decomposed by RNase. The level of CuZn-SOD mRNA of the high-dosage group (75.6 mg.kg-1.d) was higher than that of the control group (0 mg.kg-1.d) (P < 0.01); the CuZn-SOD activities of the high-dosage group were significantly higher than those of the control group (P < 0.001) and the CuZn-SOD activities of the middle- (37.8 mg.kg-1.d) and low-dosage groups (18.9 mg.kg-1.d) were higher than those of the control group (P < 0.01). CONCLUSION: PGMS can increase the CuZn-SOD activities as well as CuZn-SOD on mRNA level. Therefore, it is possible for PGMS to counteract Atherosclerosis (AS) by inducing the expression of CuZn-SOD.