褐藻糖胶调节大鼠脂质代谢紊乱的作用

目的研究褐藻糖胶(FPS)调节大鼠脂质代谢紊乱的作用。方法通过建立大鼠高脂血症模型,观察FPS对大鼠血脂水平、脂代谢酶、粪便中脂类含量、胆汁代谢、肝脏低密度脂蛋白受体(LDL-R)mRNA的影响。结果FPS能抑制高脂血症大鼠血清甘油三酯(TG)、总胆固醇(TC)、低密度脂蛋白(LDL-C)的浓度,升高高密度脂蛋白(HDL-C)的浓度和脂蛋白脂酶(LPL)、肝脂酶(HL)、卵磷脂胆固醇酰基转移酶(LCAT)的活性。FPS能增加粪便中胆固醇、甘油三酯、胆汁酸的含量,但对胆汁的分泌、胆汁中胆固醇和胆汁酸的浓度却无显著影响。逆转录聚合酶链反应(RT-PCR)实验显示,FPS能显著提高高脂血症大鼠肝脏LDL-R mRNA的表达水平。结论FPS可能通过抑制脂质(甘油三酯、胆固醇、胆汁酸)的吸收,激活脂代谢酶(LPL、HL、LCAT)的活性,促进肝脏低密度脂蛋白受体(LDL-R)mRNA的表达来调节脂质代谢紊乱。

Regulatory Mechanism of Fucoidan for Disorder of Lipid Metabolism in Rats

Objective To explore the mechanism of Fudoidan for regulating the disorder of lipid metabolism in rats. Methods Rat hyperlipidemic model was established. The effect of Fudoidan on rats levels of blood lipids, lipid metabolic enzyme, and the lipid contents in the stool, as well as bile metabolismand LDL-R mRNA expression in the liver were observed. Results Fudoidan can notably restrain the concentration of serum total cholesterol (TC), triglyceride (TG), low-density lipoprotein cholesterol (LDL-C) of hyperlipidemic rats and increase the concentration of high-density lipoprotein cholesterol (HDL-C) and activities of 1ipoprotein lipase (LPL), hepatic lipoprotein (HL) and lecithin cholesterol acyltransferase (LCAT).Fucoidan can remarkably increase the contents of cholesterol, TG, bile acid , but has no effect on the secretion of bile, the concentration of cholesterol and bile acid in bile. The results of RT-PCR experiment showed that Fudoidan can notably improve the expression level of low-density lipoprotein receptor (LDL-R) mRNA in the liver of hyperlipidemic rats. Conclusion Fucoidan can regulate the disorder of lipid metabolism probably by restraining the absorption of lipids (TC, cholesterol, bile acid) , activating the activities of lipid metabolic enzyme (LPL, HL and LCAT), and promoting the expression of LDL-R mRNA in the liver.