阿魏酸钠对高脂血症致动脉粥样硬化过程中胆固醇和甘油三酯代谢的影响

目的：观察阿魏酸钠(SF)对高脂血症引起的动脉粥样硬化(AS)过程中胆固醇和甘油三酯代谢的影响，进一步探讨其抗动脉粥样硬化的作用机制。方法: 高胆固醇喂养复制AS动物模型；以氧化型低密度脂蛋白（ox-LDL）与小鼠巨噬细胞株RAW264.7细胞体外共培养，诱导建立泡沫细胞模型，与人肝母细胞瘤细胞株HepG2细胞体外共培养，建立损伤细胞模型；分别给予SF进行干预。检测实验动物AS斑块面积和血脂水平，油红O染色观察RAW264.7细胞内脂质堆积情况，高效液相色谱定量分析RAW264.7细胞内胆固醇的含量，逆转录聚合酶链反应（RT-PCR）测定HepG2细胞肝脂酶（HL）mRNA的表达水平。结果: (1)与高脂组相比，高脂+SF组动物主动脉粥样斑块面积明显减小（P<0.01），血浆甘油三酯水平显著降低（P<0.01），但血浆胆固醇水平无明显改变（P>0.05）；(2) 与ox-LDL组相比，ox-LDL+SF处理组中HepG2细胞HL mRNA表达水平显著增加（P<0.01），但RAW264.7细胞内胆固醇含量无明显改变（P>0.05）。结论: SF能降低高胆固醇导致的AS斑块面积，具有抗动脉粥样硬化的作用，其作用机制可能与上调HL mRNA表达水平从而降低血浆甘油三酯水平有关，而与血浆胆固醇水平和ox-LDL诱导的巨噬泡沫细胞形成无关。提示血浆甘油三酯升高是AS的独立危险因素，HL介导的甘油三酯代谢途径可能是AS治疗的潜在靶点。

Effects of sodium ferulate on cholesterol and triglyceride metabolism in atherosclerosis with hyperlipidemia

AIM:To investigate the effects of sodium ferulate on cholesterol and triglyceride metabolism in atherosclerosis with hyperlipidemia. METHODS:The rabbit model of atherosclerosis was produced by feeding high lipid forages. RAW264.7 foam cell and HepG2 injured cell models were established by incubation with oxidized low density lipoprotein (ox-LDL). The atherosclerotic plaque area was measured, and serum lipids were detected. The cellular lipid accumulation was examined by oil red O staining. The cellular contents of total cholesterol and cholesterol ester were quantified by high performance liquid chromatography. The hepatic lipase (HL) mRNA expression was determined by RT-PCR. RESULTS:(1) Compared with hyperlipid group, the aorta atherosclerosis plaque area and the serum triglyceride level were significantly decreased in sodium ferulate-treated rabbits, but the serum cholesterol level showed little change. (2) Compared with ox-LDL group, the HL mRNA expression in HepG2 cells was enhanced significantly in sodium ferulate-treated group, but the cellular contents of total cholesterol and cholesterol ester in RAW264.7 foam cells showed little change. CONCLUSION:Sodium ferulate inhibits the formation of atherosclerotic plaque in high-cholesterol-fed rabbits aorta. This antiatherosclerotic function may reduce serum triglyceride level through enhancing the expression of HL mRNA without influencing serum cholesterol level and foam cell formation.