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Calpain-1、caspase-3表达在氟致肾细胞凋亡中作用

DOI: 10.11847/zgggws2015-31-11-14, PP. 1412-1416

Keywords: 氟中毒,calpain-1,caspase-3,肾小管上皮细胞,凋亡

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Abstract:

?目的观察氟对大鼠肾脏calpain-1、caspase-3蛋白及其mRNA表达和肾小管上皮细胞凋亡的影响。方法健康SD大鼠36只,随机分为对照组、低氟组和高氟组3组,每组12只,雌雄各半,分别饮用<1、5、50mg/L氟化钠的自来水,连续8个月;定期检查大鼠氟斑牙发生情况,实验期末,收集大鼠24h尿液测尿氟含量;应用免疫组化和原位杂交法检测肾组织中calpain-1和caspase-3蛋白及mRNA表达;原位末端脱氧核苷酸转移酶标记法(TUNEL)及流式细胞仪检测肾小管上皮细胞凋亡率。结果染氟组大鼠出现不同程度氟斑牙表现,且高氟组大鼠氟斑牙程度重于低氟组;与对照组比较,染氟组大鼠尿氟含量明显升高,低、高氟组大鼠肾小管上皮细胞中calpain-1和caspase-3表达[分别为(77.00±7.60)、(83.62±7.78)和(62.33±5.86)、(66.65±3.87)]升高(P<0.05),呈剂量效应关系;肾组织中mRNA表达与蛋白表达水平一致;与对照组比较,低、高剂量染氟组大鼠肾小管上皮细胞凋亡率[(19.76±2.21)%、(24.58±2.57)%]均增加(P<0.05);肾小管上皮细胞中calpain-1表达与caspase-3表达呈正相关(r=0.699,P<0.05)。结论Calpain-1、caspase-3基因表达升高引起的肾小管上皮细胞凋亡是慢性氟中毒大鼠肾脏病变的机制之一。

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