茶多酚对实验性动脉粥样硬化兔脂蛋白脂酶、肝脂酶活性的影响及意义

目的:观察动脉粥样硬化(AS)发生发展过程中脂蛋白脂酶(LPL)、肝脂酶(HL)活性的变化及茶多酚(TP)的作用。方法:高脂食物AS模型兔口服茶多酚200μg·g^-1·d^-1,测定血浆中LPL、HL活性,同时用组织化学法检测动脉壁层组织中LPL活性、肝组织中HL活性。结果:AS组动脉粥样硬化病变血管壁与正常对照组血管壁组织中LPL活性差异无显著(P＞0.05);AS组肝组织中HL活性明显低于正常对照组(P＜0.05)。TP组肝组织中HL活性明显高于AS组(P＜0.05)、血浆中TC和LDL-c水平低于AS组(P＜0.05)、动脉粥样硬化斑块面积低于AS组(P＜0.05)。各组间血浆LPL、HL活性水平差异无显著(P＞0.05)。结论:茶多酚能增加实验性AS兔肝组织中HL脂酶活性,这一作用与降低血浆胆固醇水平和抗动脉粥样硬化密切相关。

Effect of tea-polyphenols on the lipoprotein lipase and hepatic lipase activity in atherosclerosis rabbits

AIM: To investigate the effect of tea-polyphenols (TP) on the lipoprotein lipase (LPL) and hepatic lipase (HL) activity in atherosclerosis (AS) rabbits. METHODS: The rabbits feeding lipodiet were taken in 200 μg·g^-1·d^-1 TP through the experiment. The LPL and HL activity in the plasma of rabbits were detected. The LPL activity in the arteria tissue and HL activity in liver tissue were estimated with histochemistry technique. RESULTS: The LPL and HL activity in the plasma were not significantly different between premier and post experiment in AS rabbits (P＞0.05), between AS group and control group (P＞0.05). The LPL activity in the arteria tissue were not different between AS group and control group (P＞0.05). HL activity in liver tissue in AS group was significantly lower than control group (P＜0.05), but TP group was higher than AS group (P＜0.05). In TP group, the TC and LDL-c level in plasma were lower (P＜0.05), and the area of atherosclerosis plaque were smaller than those in AS group (P＜0.05). CONCLUSION: TP increased HL activity in liver tissue in AS rabbits, which correlated with decreasing the TC and LDL-c level in plasma and the area of atherosclerosis plaque.