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尿毒症血清蛋白对血管内皮细胞的损伤作用

, PP. 2485-2488

Keywords: 蛋白结合尿毒症毒素,人脐静脉内皮细胞,一氧化氮合酶,内皮膜微粒

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Abstract:

目的研究尿毒症血清蛋白对人血管内皮细胞的损伤作用,探讨蛋白结合尿毒症毒素对人血管内皮细胞的损伤作用。方法采集维持性血液透析尿毒症患者和正常健康人的静脉血,经过血清分离、透析、低温真空冻干等处理提取血清蛋白,以不同浓度的尿毒症血清蛋白溶液或正常血清蛋白溶液(0.4%、1%、2%、4%)刺激人脐静脉内皮细胞(HUVEC)不同时间(24、48、72h),设置空白对照组。倒置相差显微镜观察细胞形态,CCK-8检测细胞增殖抑制率,一氧化氮(NO)试剂盒、一氧化氮合酶(NOS)试剂盒分别检测细胞培养上清液NO浓度和细胞NOS活性,流式细胞仪检测内皮细胞膜微粒(EMPs)产生率、细胞凋亡率。结果与正常血清蛋白溶液组、空白对照组比较,尿毒症血清蛋白溶液组细胞折光性差,细胞间隙增宽,细胞膜表面毛糙,细胞突起明显增多,细胞形态各异,胞浆颗粒明显增加。不同浓度的尿毒症血清蛋白溶液处理HUVEC的细胞增殖率均显著低于相应正常血清组和空白对照组(P<0.05)。与正常蛋白溶液组、空白对照组比较,尿毒症蛋白溶液组细胞培养上清液中NO浓度降低、细胞NOS活性明显降低(P<0.05)。尿毒症蛋白溶液组EMPs产生率为(62.57±1.59)%,显著高于空白对照组(7.3±0.57)%和正常蛋白溶液组(13±0.94)%(P<0.05)。尿毒症蛋白溶液对HUVEC细胞凋亡无明显影响。结论尿毒症血清蛋白溶液能使内皮细胞形态发生变化,抑制内皮细胞增殖,损伤内皮细胞分泌功能,导致内皮细胞功能受损。

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