白蛋白对肾小管上皮细胞血管紧张素转换酶表达的影响  

Effects of albumin on the expression of angiotensin-converting enzyme in human proximal tubular cells

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作  者:高珺[1,2] 刘必成[1] 张晓良[1] 宫壮[1] 弓玉祥[1] 

机构地区:[1]东南大学肾脏病研究所东南大学附属中大医院肾脏科,南京 210009 [2]东南大学医学院附属徐州医院肾内科

出  处:《中华肾脏病杂志》2008年第11期838-841,共4页Chinese Journal of Nephrology

基  金:国家自然科学基金(30870953);江苏省自然科学基金重点项目(BK2007709);江苏省兴卫工程医学重点人才基金(RC2007105)

摘  要:目的观察白蛋白对肾小管上皮细胞血管紧张素转换酶(ACE)mRNA和蛋白水平表达的影响,并探讨尿蛋白激活肾脏局部肾素.血管紧张素系统(RAS)的机制。方法分别采用2.5、5、10g/L的牛血清白蛋白(BSA)刺激人近端肾小管上皮细胞株(HK-2)6h和12h。并分别采用实时定量PCR和Western印迹检测ACEmRNA和蛋白水平的表达。结果与对照组相比,随着BSA刺激浓度的增加,HK-2细胞ACEmRNA表达均显著增加(均P〈0.05)。同时,Western印迹显示ACE蛋白表达也均显著增加(均P〈0.05)。另外,BSA10g/L作用于HK-2细胞6h和12h后,ACEmRNA表达显著增加(均P〈0.05);Western印迹显示ACE蛋白也显著增加(均P〈0.05)。结论BSA可显著增加HK-2细胞ACE表达,此作用可能是导致肾间质局部AngⅡ蓄积从而启动肾小管间质纤维化的重要机制之一。Objective To investigate the influence of albumin on the expression of angiotensin-converting enzyme (ACE) in cuhured human proximal tubular calls (HK-2). Methods HK-2 cells were exposed to 2.5, 5, 10 g/L bovine serum albumin (BSA) for 6 h and 12 h respectively. The expression of ACE in HK-2 ceils was detected by real-time RT-PCR and Western blot. Results Compared to the control group, the expression of HK-2 cells ACE mRNA treated for 12 h with different concentrations of BSA (2.5, 5, 10 g/L) significantly increased (P〈0.05). Furthermore, Western blot analysis showed that the expression of ACE protein induced by BSA significantly increased (P〈 0.05). Treated with BSA (10 g/L) for 6 h and 12 h, the expression of ACE mRNA significantly increased in a time-dependent manner (P 〈0.05, respectively), and the ACE protein expression significantly increased (P〈0.05, respectively). Conclusion BSA can induce ACE up-regulation in proximal tubular cells, which may lead to the increased production of local AngⅡ and finally contributes to the intrarenal activation of renin angiotensin system (RAS).

关 键 词:血管紧张素转换酶 白蛋白 血管紧张素Ⅱ 肾小管上皮细胞 

分 类 号:R692.6[医药卫生—泌尿科学]

 

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