年龄与性别对高密度脂蛋白抗氧化抗炎以及抗凋亡功能影响的研究

摘要

目的 研究年龄与性别对高密度脂蛋白(HDL)抗炎、抗氧化、抗凋亡功能的影响.方法 随机选取年龄20～60岁健康男性和女性各60例为中青年男性组及中青年女性组,60～78岁健康男性和女性各60例为老年男性组和老年女性组.检测各组高密度脂蛋白胆固醇(HDL-C)、总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)、三酰甘油(TG)等血脂指标.检测丙二醛含量以检测高密度脂蛋白(HDL)抗氧化能力;通过内皮细胞与单核细胞(THP1)黏附试验检测HDL对内皮细胞的保护作用;Western blot检测内皮细胞黏附分子VCAM-1和ICAM-1的表达;MTT法检测人脐静脉内皮细胞的相对细胞存活率和流式细胞仪测凋亡水平来检测HDL的抗凋亡作用. 结果 老年女性组LDL-C、TG、TC及丙二醛含量高于其他3组(均P＜0.05);中青年女性组HDL-C高于其他3组(均P＜0.05);老年男性组丙二醛含量高于中青年男性组及中青年女性组(均P＜0.05);老年组HDL保护后单核细胞黏附数较中青年组增加(P＜0.05).老年组HDL保护后黏附分子VCAM-1和ICAM-1表达均高于中青年组(P＜0.05);中青年组HDL保护后内皮细胞相对存活率高于老年组(P＜0.05),中青年组HDL保护后的细胞活力高于老年组(P＜0.05). 结论 随着增龄男、女性HDL的水平及其抗氧化、抗炎、抗凋亡功能降低,女性HDL抗氧化功能较男性降低更为明显.%Objective To investigate the effects of age and gender on anti-oxidative,antiinflammatory and anti-apoptosis functions of high-density lipoprotein (HDL).Methods Totally 120 healthy subjects aged from 20 to 60 years were randomly divided into young and middle-aged male (n=60) group and female (n =60) group,and the 120 healthy elderly aged from 60 to 78 years divided into elderly male (n =60) and elderly female (n =60) groups.Serum levels of high-and low-density lipoprotein cholesterol (HDL-C,LDL-C),total cholesterol (TC),and triacylglycerol (TG) were detected.Content of malonaldehyde (MDA) was detected to determine anti-oxidative function of HDL.Adhesion assay of endothelial cells and monocytes (THP1) was adopted to test the protective effects of HDL on endothelial cells.The expressions of endothelial cell adhesion molecules,VCAM-1 and ICAM-1,were analyzed by Western blot.MTT and flow cytometry assays were used to detect the viability and apoptosis of the cells to test anti-apoptosis function of HDL.Results The levels of low-density lipoprotein,triglycerides and total cholesterol were higher in elder female group than in other three groups (all P＜0.05).The level of HDL-C was higher in young and middle-aged females than in other three groups(all P＜0.05).The level of MDA was higher in elder female group than in other three groups(all P＜0.05).The level of MDA was higher in elder male group than in the young and middle-aged male and female groups(all P＜0.05).After protection of HDL,the number of monocytes adhesion and expression levels of VCAM-1 and ICAM-1 were higher in elder groups than in young and middle-aged male and female groups(all P＜ 0.05).Relative survival and viability rates of endothelial cells were higher in young and middle-aged groups than in elder groups (all P＜0.05).Conclusions Ageing in both male and female induces impairments of anti-oxidative,anti-inflammatory and anti-apoptosis functions of HDL,with more evident decrease in anti-oxidative function in females.