缺血性脑血管病患者血浆卵磷脂-胆固醇酰基转移酶活性与其脂质代谢

摘要

背景:脂质代谢异常是缺血性脑血管病的危险因素之一.很多研究提出其与体内卵磷脂-胆固醇酰基转移酶活性变化有关.目的:观察缺血性脑血管病患者血浆卵磷脂-胆固醇酰基转移酶活性与红细胞膜脂质成分含量变化的关系.设计:病例对照(实验组对照,标准对照).单位:一所大学医学院附属医院的检验科、急诊室及神经内科.对象:2002-03/2003-12青岛大学医学院附属医院急诊神经门诊就诊及住院的脑血管病患者105例,均符合第二届全国脑血管病会议的诊断标准,选择脑动脉硬化患者42例和脑梗死63例构成两个患者组,其中男67例,女38例.同期选择在本院健康查体者65例构成对照组,男36例,女29例.方法:采集参与者空腹血8 mL,采用酶学方法检测血浆卵磷脂-胆固醇酰基转移酶活性和血清高密度脂蛋白胆固醇、低密度脂蛋白胆固醇、载脂蛋白A1和载脂蛋白B水平,采用邻苯二甲醛-醋酸硫酸方法测定红细胞膜胆固醇含量,采用化学定量法测定红细胞膜磷脂含量.主要观察指标:患者组与对照组卵磷脂-胆固醇酰基转移酶活性变化及红细胞膜脂质成分含量的变化.结果:按意向分析处理,105例患者组和65例对照组全部进入结果分析.①卵磷脂-胆固醇酰基转移酶活性:脑动脉硬化组和脑梗死组活性变化均明显低于对照组[(2.14±0.72)kat/L,(2.06±0.80)kat/L,(2.61±0.74)kat/L,P＜0.01].②高密度脂蛋白胆固醇与载脂蛋白A1水平:脑动脉梗化组与脑梗死组明显低于对照组[(11.32±0.33)mmol/L,(1.37±0.33)g/L,(1.28±0.33)mmol/L,(1.27±0.31)g/L,(1.60±0.43)mmol/L,(1.60±0.43)g/L,(t=2.72～5.01,P＜0.01)].③低密度脂蛋白胆固醇及红细胞胆固醇含量:脑动脉硬化组与脑梗死组明显高于对照组[(2.94±0.82)mmol/L,(0.63±0.05)mmol/g,(3.02±0.79)mmol/L,(0.60±0.07)mmol/g,(2.56±0.58)mmol/L,(0.57±0.05)mmol/g,(P＜0.01)].并且卵磷脂-胆固醇酰基转移酶活性分别与高密度脂蛋白胆固醇及载脂蛋白A1呈正相关(r=0.247,P＜0.05;r=0.303,P＜0.01),而与低密度脂蛋白胆固醇和红细胞膜胆固醇呈负相关(r=-0.212,P＜0.05;r=-0.346,P＜0.01).结论:缺血性脑血管病患者血浆卵磷脂-胆固醇酰基转移酶活性下降,且并非继发于脑梗死发生后,其活性变化与高密度脂蛋白胆固醇及载脂蛋白A1呈正相关,与低密度脂蛋白胆固醇及红细胞膜胆固醇呈负相关性.%BACKGROUND: Abnormal lipid metabolism is one of the risk factors in patients with ischemic cerebral disorders, and is correlated with the changes of lecithin cholesterol acyltransferase activity.OBJECTIVE: To observe the relationship between the changes of lecithin cholesterol acyltransferase activity and lipid content in red blood cell membrane.DESIGN: A case-control study(experimental group with control as standard level).SETTING: Department of clinical laboratory, emergency room and department of neurology of a hospital affiliated to a medical college of a university.PARTICIPANTS: Totally 105 inpatients and outpatients with cerebrovascular diseases were selected from the Department of Neurology, Affiliated Hospital of Medical College of Qingdao University, from March 2002 to December 2003. They accorded with the Diagnostic Criteria set at the Second National Conference on Cerebrovascular Diseases. A total of 42 patients with cerebral arteriosclerosis and 63 patients with cerebral infarction were selected as patients group consisting of 67 males and 38 females. Another 65 healthy people receiving physical examination in the hospital, 36 males and 29 females, were selected as control group.METHODS: Venous blood of 8 mL was drawn from the participants on an empty stomach. We assayed the activity of lecithin cholesterol acyltransferase,high density lipoprotein cholesterol, low density lipoprotein cholesterol,apolipoprotein A1 and apolipoprotein B. Red blood cell membrane cholesterol was determined by phthalyl aldehyde-acetometry and red blood cell membrane phospholipid was determined by chemical quantitative analysis.MAIN OUTCOME MEASURES: Changes of lecithin cholesterol acyltransferase activity and lipid content in red blood cell membrane in patients group and control group.RESULTS: According to intention analysis, all the 105 patients in patients group and 65 patients in control group entered the results analysis. Activity of lecithin cholesterol acyltransferase: Activity changes in cerebral arteriosclerosis group and cerebral infarction group were obvious lower than those in control group[(2.14±0.72) kat/L, (2.06±0.80) kat/L, and(2.61± 0. 74) kat/L, P ＜ 0.01 ] . Level of high density lipoprotein cholesterol and apolipoprotein A1: The level in cerebral arteriosclerosis group and cerebral infarction group was obvious lower than that in control group[ (1.32±0.33) mmol/L, (1.37±0.33) g/L, (1.28±0.33) mmol/L; (1.27±0.31) g/L, (1.60±0.43) mmol/L, (1.60±0.43) g/L, t=2.72 to 5.01, P ＜ 0.01 ]. Content of low density lipoprotein cholesterol and red blood cell membrane-cholesterol: The content in cerebral arteriosclerosis group and cerebral infarction group was obvious higher than that in control group [ (2.94 ± 0. 82) mmol/L, (0.63 ±0.05) mmol/g, (3.02 ±0.79) mmol/L;(0.60 ±0.07) mmol/g, (2.56 ±0. 58) mmol/L, (0.57 ±0.05) mmol/g, P ＜ 0. 01 ] . Moreover, the activity of lecithin cholesterol acyltransferase was positively correlated with high density lipoprotein cholesterol and apolipoprotein A1(r=0.247, P ＜0.05; r=0.303, P ＜0.01), but was negatively correlated with low density lipoprotein cholesterol and red blood cell membrane cholesterol(r= -0.212, P ＜0.05;r= -0.346, P ＜0.01).CONCLUSION: In patients with ischemic cerebral disorders, the major change of plasma lipid is the decrease of lecithin cholesterol acyltransferase,but it is not secondary to cerebral infarction. The activity of lecithin cholesterol acyltransferase is positively correlated with high density lipoprotein cholesterol and apolipoprotein A1, but is negatively correlated with low density lipoprotein cholesterol and red blood cell membrane cholesterol.