吉林大学学报(医学版)

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WNT4基因沉默对PAX2诱导肾小管上皮细胞间充质转分化的影响

李里1,2,南晓娟1,吴玉斌1   

  1. 1.中国医科大学附属盛京医院小儿肾脏风湿免疫科,辽宁 沈阳 110004;2.辽宁医学院附属第一医院儿科,辽宁 锦州 121000
  • 收稿日期:2012-11-17 出版日期:2013-07-28 发布日期:2013-08-17
  • 通讯作者: 吴玉斌(Tel:024-83955555,E-mail:wuyb@sj-hospital.org) E-mail:wuyb@sj-hospital.org
  • 作者简介:李 里(1978-),女,辽宁省锦州市人,在读医学博士,主要从事小儿肾脏疾病研究。
  • 基金资助:

    辽宁省沈阳市科学技术计划项目资助课题(F10-205-1-29);中国医科大学附属盛京医院博士优秀课题基金资助课题(ma26)

Influence of WNT4 siRNA in PAX2-induced epithelial-mesenchymal transition in normal renal tubular epithelial cells

LI Li1,2,NAN Xiao-juan1,WU Yu-bin1   

  1. 1.  Department of Pediatric Nephrology and Rheumatology,Shengjing Hospital,China Medical University,Shenyang 110004,China;2. Department of Pediatrics,First Affiliated Hospital,                Liaoning Medical College,Jinzhou 121000,China
  • Received:2012-11-17 Online:2013-07-28 Published:2013-08-17

摘要:

目的:观察体外转染配对盒基因2(PAX2)对WNT4通路的激活作用及WNT4通路对PAX2诱导转分化的作用,探讨PAX2转分化机制。方法:应用脂质体介导将重组质粒pEGFP-PAX2转染入体外培养的大鼠肾小管上皮细胞,经G418 筛选,建立稳定表达PAX2细胞系。细胞分为稳定转染PAX2组、空载组和对照组。Western blotting法和实时荧光定量(Real-time)PCR法检测各组细胞WNT4和β-catenin表达。应用靶向WNT4基因的siRNA沉默稳定转染PAX2细胞的WNT4,应用荧光显微镜观察转染效率,进行沉默鉴定筛选出最佳干扰链。将最佳干扰链WNT4 siRNA转染至稳定转染PAX2细胞。在沉默24、48、72和96 h应用Western blotting法和Real-time PCR法检测β-catenin、正常肾小管上皮细胞表型标志物E-钙黏蛋白(E-cadherin)和成纤维细胞表型标志物α-肌动蛋白(α-SMA)表达,同时筛选出沉默最佳时间点。应用免疫组织化学染色法检测沉默最佳时间点组E-cadherin和α-SMA蛋白表达。结果:Western blotting和Real-time PCR检测,稳定转染PAX2细胞组WNT4 和β-catenin蛋白及mRNA表达水平较空载组和对照组明显增加(P<0.05)。阴性siRNA转染入稳定转染PAX2细胞24 h 后荧光显微镜观察,转染效率为47.46%±4.48%。3条WNT4干扰链分别转染至稳定转染PAX2细胞,Real-time PCR和Western blotting结果显示第3干扰链沉默效果最佳,WNT4 mRNA 表达抑制率为66.9 %±3.8%(P<0.05); WNT4 蛋白表达抑制率为63.7%±2.5%(P<0.05)。将最佳干扰链转染至稳定转染PAX2细胞,干扰24、48、72和96 h后,各时间点细胞中的β-catenin mRNA及蛋白表达水平较对照组下调,72 h组下调明显(P<0.05);各时间点细胞中E-cadherin mRNA及蛋白表达水平较对照组明显上调,72 h组上调明显(P<0.05);各时间点细胞中α-SMA mRNA及蛋白表达水平较对照组明显下调,72 h下调明显(P<0.05)。结论:PAX2转染至肾小管上皮细胞后激活了WNT4通路,PAX2在体外诱导正常肾小管上皮细胞间充质转分化可能是通过WNT4/β-catenin通路完成。

关键词:  , WNT4, 配对盒基因2, 肾小管上皮细胞, 转分化, RNA干扰

Abstract:

Abstract:Objective To observe the activational effect of   PAX2 transfection on Wnt4 pathway and  the effect of WNT4 gene on PAX2-induced epithelial- mesenchymal transition,and to discuss the mechanism of PAX2 transition.  Methods The pEGFP-PAX2 plasmid was transfected into rat normal renal tubular epithelial cells(NRK52E) with lipofectamine 2000.The cell line NRK52E stable expressing PAX2 was constructed by G418.NRK52E were divided into control group,empty vector group and stable transfection PAX2 group.The expressions of WNT4 and β-catenin were examined by Western blotting and Real-time PCR in various groups.The WNT4 gene siRNA silencing  was stably transfected into WNT4 of  PAX2 cells  and evaluated through fluorescence detection,and the best chain was chosen.After the best WNT4 siRNA chain was transfected into NRK52E,the expressions of β-catenin,E-cadherin and α-SMA were examined by Western blotting and Real time-PCR at 24,48,72, and 96 h after silencing.Results The Western blotting and Real-time PCR results showed that the protein and mRNA expressions of WNT4 and β-catenin  in stable transfection PAX2 group  were significantly increased  compared with control group and empty vector group(P<0.05).The transfection efficiency of negtive siRNA was(47.46±4.48)%.The third WNT4 transfection chain  was the best transfection chain detected by Real-time PCR and Western blotting. The inhibitory rate of WNT4 m RNA was (66.9±3.8)%(P<0.05),and the inhibitory rate of WNT4 protein was (63.7±2.5)%(P<0.05). 24,48,72, and 96 h after WNT4 siRNA transfection,compared with control group,the mRNA and protein expressions of β-catenin were decreased,especially at 72 h(P<0.05);the mRNA and protein expressions of E-cadherin were increased,especially at 72 h(P<0.05);the mRNA and protein expressions of α-SMA were decreased,especially at 72 h(P<0.05).Conclusion PAX2 could activate WNT4/β-catenin pathway.PAX2 may induce epitheial-mesenchymal transition in normal renal tubular epithelial cells through  WNT4/β-catenin pathway.

Key words: WNT4, paired box gene 2, renal tubular epithelial cells;transition, RNAi

中图分类号: 

  • R586