血浆前蛋白转化酶枯草溶菌素9 与钙化性主动脉瓣疾病的关联机制

目的:探讨血浆前蛋白转化酶枯草溶菌素9(PCSK9)与钙化性主动脉瓣疾病(CAVD)的相关性。方法:经心脏彩超筛选CAVD 患者120 例及阴性对照组患者40 例,通过CT 定量评分系统分4 组:AVC 1、2、3 和4 级,并通过软件计算主动脉瓣钙化积分。检测血浆总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)、高密度脂蛋白胆固醇(HDL-C)、三酰甘油(TG)、载脂蛋白A1(Apo A1)及载脂蛋白B(Apo B)、脂蛋白(a){LP(a)}和高敏C 反应蛋白(hsCRP)水平以及PCSK9 水平。结果:4组患者LDL-C、Apo B 和Lp(a) 水平差异有显著性(P<0.05),AVC2-4 级患者明显高于AVC1 级,而TG、HDL-C、apo A1 和hsCRP 组间差异无统计学意义。AVC3 级和AVC 4 级的TC 水平高于AVC1 组(P<0.05)。同时,AVC2-4 组血浆PCSK9 水平高于AVC1 组(P<0.05)。将所有人群的主动脉瓣钙化积分与TC(r =0.248,P =0.026),LDL-C (r =0.222,P =0.048),Lp(a)(r =0.276,P =0.013),Apo A1(r =0.245,P =0.012),Apo B(r =0.212,P =0.019)和PCSK9(r =0.309,P =0.005)均存在明显相关性,ApoA1,Apo B 呈正相关。结论:CAVD 患者PCSK9 水平明显高于对照组,PCSK9 与CAVD 的发生存在相关性。

Association mechanism of plasma protein convertase subtilisin / Kexin type 9 and calcific aortic valve disease

Objective: To evaluate the association between the level of plasma proprotein convertase subtilisin/ Kexin 9 (PCSK9) with incidence and severity of calcified aortic valve disease(CAVD).Methods:We prospectively recruited 120 CAVD patients with at least increased echo density and 40 control patients by transthoracic echocardiography.All patients were grouped by CT quantitative scoring system: aortic valve calcification ( AVC) 1,2,3 and 4.Calcium score of aortic valve were calculated.Total cholesterol (TC),low density lipoprotein cholesterol (LDL-C),high density lipoprotein cholesterol (HDL-C),triglyceride (TG),carrying lipoprotein A1 (apo A1) and apolipoprotein B (apo B),lipoprotein (a) {LP (a)} and hypersensitive C-reactive protein (hsCRP) were detected by biochemical analyzer.Plasma PCSK9 levels were measured by enzyme-linked immunosorbent assay.The relationship between AVC and plasma PCSK9 level,blood lipid,Apo A1,Apo B and hsCRP was analyzed.Results:The data indicated that Apo,B Lp(a) and LDL-C levels in AVC2-4 level was significantly higher than that of AVC1(P<0.05),while TG,APO,A1 HDL-C and hsCRP were not different significantly in the four groups.The levels of TC in group AVC3 and AVC4 were significantly higher than those in group AVC1(P<0.05).At the same time,the patients of grade AVC2-4 have higher level of plasma PCSK9 than patients of group AVC1(P<0.05).Correlation analysis was performed and aortic valve calcium score were significantly correlated with TC (r =0.248,P =0.026),LDL-C (r =0.222,P =0.048),Lp(a) (r =0.276,P =0.013),Apo A1(r =0.245,P =0.012),Apo B (r =0.212,P=0.019) and PCSK9(r =0.309,P =0.005) in all study subjects.PCSK9 was positively correlated with TC,LDL,LP (a),Apo A1,Apo,and no correlation with hsCRP (B).Conclusion:The level of PCSK9 in CAVD patients was significantly higher than that in control group.And there is an association of PCSK9 levels with the presence of CAVD,however.