糖尿病及其视网膜病变患者氧化应激状态的评价

目的 观察糖尿病及其视网膜病变患者血清抗氧化酶活性及非酶类抗氧化物、氧化应激代谢产物的水平,探讨氧化应激与糖尿病视网膜病变之间的关系.方法 选择51例2型糖尿病患者,其中糖尿病无并发症者24例(DM组),糖尿病合并视网膜病变者27例(DR组),另选择同期行体检的30例健康者为对照组.收集3组受检者的空腹血清,测定血清抗氧化酶超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)及过氧化氢酶(CAT)]活性、非酶类抗氧化物维生素C(V_C)、维生素E(V_E)及还原型谷胱甘肽(GSH)]水平及氧化应激代谢产物丙二醛(MDA)、共轭二烯(CD)及晚期蛋白质氧化产物(AOPP)]水平.结果 (1)DM组患者血清SOD、GSH-Px、CAT活性分别为(108±14)U/ml、(141±30)U/ml和(5.6±1.6)U/ml;DR组患者分别为(96±13)U/ml、(133±25)U/ml和(5.1±1.4)U/ml;对照组分别为(119±28)U/ml、(156±26)U/ml和(6.8±1.6)U/ml;与对照组比较,DM组及DR组患者血清抗氧化酶活性均显著降低(P＜0.05),且DR组患者SOD活性又显著低于DM组患者(P＜0.05).(2)对照组V_C、V_E、GSH水平分别为(86±26)mg/L、(19.0±5.3)mg/L和(22.0±5.9)μmol/L;DM组患者分别为(64±20)mg/L、(16.6±3.7)mg/L和(20.8±8.2)μmol/L;DR组患者分别为(52±10)mg/L、(16.6±3.7)mg/L和(19.7±5.7)μmol/L;与对照组比较,DM组及DR组患者血清V_C水平均显著降低(P＜0.01),而DR组患者血清V_C水平又显著低于DM组(P＜0.05).(3)对照组血清MDA、CD、AOPP水平分别为(3.1±1.3)μmol/L、(0.32±0.06)和(15.8±4.5)μmol/L;DM组患者分别为(5.4±1.8)μmol/L、(0.43±0.23)和(25.6±7.7)μmol/L;DR组患者分别为(7.9±2.6)μmol/L、(0.57±0.27)和(27.8±7.2)μmol/L;与对照组比较,糖尿病患者氧化应激代谢产物水平显著升高(P＜0.05),且DR组患者血清MDA、CD水平较DM组患者显著升高(P＜0.05).结论 糖尿病及其视网膜病变患者存在着严重的氧化应激,且糖尿病视网膜病变患者氧化应激更严重.

Study of Oxidative Stress Status in Patients with Diabetes Mellitus and Diabetic Retinopathy

Objective To observe antioxidative enzymes,non-enzyme antioxidants and metabolite level of oxidative stress in T2DM patients with or without retinopathy to explore the relationship between oxidative stress and diabetic retinopathy.Methods Fifty-one T2DM patients were divided into groups DM(without complications,n=24) and DR(with retinopathy,n=27),and another 30 healthy subjects were enrolled as control group.Superoxide dismutase(SOD),glutathione peroxidase(GSH-Px),catalase(CAT),vitamin C(VC),vitamin E(VE),g...