白术精提物对代谢性高脂血症大鼠的药效及机制研究

高脂血症是导致冠心病、动脉粥样硬化的主要因素,高密度脂蛋白-胆固醇(HDL-C)是衡量血脂水平的主要指标,但目前尚没有明显升高HDL-C的药物.实验室既往研究发现白术精提物能显著升高高血脂大鼠的HDL-C水平.该研究用高糖高脂复合酒饮方法建立代谢性高脂血症大鼠,研究白术精提物对大鼠血脂的影响及降脂机制.结果表明不同剂量的白术精提物能降低高脂大鼠血清总胆固醇(TC)、甘油三酯(TG)、低密度脂蛋白-胆固醇(LDL-C)、胆固醇酰基转移酶(ACAT),升高卵磷脂胆固醇酰基转移酶(LCAT)和HDL-C,其中100 mg·kg^-1剂量组可升高HDL-C约50%;肝组织中羟甲基戊二酰辅酶A还原酶(HMG-CoA还原酶),TC,TG显著降低.提示白术精提物能有效调节高脂大鼠血脂紊乱,尤其对升高HDL-C有显著疗效,其作用机制可能与抑制肝脏中HMG-CoA还原酶来减少胆固醇合成,调节体内LCAT,ACAT水平来增加脂质代谢转运有关.

Preliminary study on efficacy and mechanism of Atractylodes Macrocephelae Rhizoma extracts in metabolic hyperlipidemia rats

Hyperlipidemia is a major factor causing coronary heart disease and atherosclerosis. The high-density lipoprotein cholesterol (HDL-C) is a major indicator for measuring lipid levels. However, there is no an effective medicine that can obviously increase HDL-C at present. According to previous laboratory studies, atractylodes macrocephalae extracts could significantly increase HDL-C level.In this study, the metabolic hyperlipidemia rat model was established by feeding high-sugar and fat diets and alcohol-drinking to explore the effect and mechanism of atractylodes macrocephalae extracts on hyperlipidemia rats. According to the findings, different doses of atractylodes macrocephalae extracts could reduce the levels of TC, TG, LDL-C, ACAT and increase the contents of LCAT, HDL-C. Particularly, the atractylodes macrocephalae extracts (100 mg·kg^-1) group showed increase in HDL-C by about 50% and significant declines in HMG-CoA reductase, TC, TG. In conclusion, Atractylodes Macrocephelae Rhizoma extracts could effectively regulate the dyslipidemia of hyperlipidemia rats, especially on HDL-C. Its mechanism may be related to reduction in cholesterol synthesis by inhibiting HMG-CoA reductase in livers and increase in lipid metabolism and transport by regulating LCAT and ACAT levels.