Objective:To investigate the effect of quercetin on ATP binding cassette transporter A1(ABCA1),liver X receptor(LXR),and proprotein convertase subtilisin/kexin type 9(PCSK9)expressions in apoE-knockout(ApoE-/-)mice.Methods:The high-fat diet-induced atherosclerosis(AS)in ApoE-/-mice was established.Thirtysix mice were divided into 3 groups using random number table method:model group(n=12),quercetin group(n=12),and atorvastatin group(n=12),with C57BL/6J mice of the same strain and age as the control group(n=12).Quercetin group and atorvastatin group were administrated with quercetin and atorvastatin by oral gavage,with doses of 12.5 and 4 mg/(kg・d),respectively.Animals in the control and model groups were given an equal volume of distilled water by oral gavage once per day for a total of 12 weeks.Western blot and immunohistochemical methods were employed to determine the aortic ABCA1,LXR-a and PCSK9 protein expressi on.En zyme linked imm uno sorbent assay method was used to detect the expressi on of serum total cholesterol(TC),triglyceride(TG),high density lipoprotein-cholesterol(HDL-C),low density lipoproteincholesterol(LDL-C),tumor necrosis factor-a(TNF-a),interleukin-6(IL-6),and IL-10,combined with tissue pathological exami nation.Results:ApoE-/-mice fed with a high-fat diet had no table atherosclerosis lesions,with reduced ABCA1,LXR-a and IL-10 levels(all P<0.01),elevated PCSK9,TNF-a and IL-6 expression,and increased TC and LDL-C con tents(all P<0.01).After querceti n in terventi on,the areas of AS plaques and the expressions of PCSK9,TNF-a and IL-6 were significantly reduced(all P<0.01),while the expressions of ABCA1 and LXR-a were increased significantly(all P<0.01).Conclusion:Quercetin effectively interfered with AS development by regulating the expressions of ABCA1,LXR-a and PCSK9 in ApoE,mice.
LI Shan-shanCAO HuiSHEN Ding-zhuCHEN ChuanXING San-liDOU Fang-fangJIA Qing-ling
