核心蛋白聚糖抑制转化生长因子β1诱导的人肾小管上皮细胞转分化机制研究  被引量:4

Mechanisms of decorin inhibiting epithelial-to-mesenchymal transition induced by transforming growth factor β1 in renal tubular epithelial cells

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作  者:王进雅[1] 鲍华英[2] 黄松明[2] 张爱华[2] 潘晓勤[3] 费莉[3] 陈荣华[3] 

机构地区:[1]南京医科大学第二附属医院儿内科,210003 [2]南京医科大学附属南京市儿童医院肾脏内科 [3]南京医科大学儿科医学研究所

出  处:《中华儿科杂志》2010年第1期50-54,共5页Chinese Journal of Pediatrics

基  金:南京市科技局人才培养项目(200306062)

摘  要:目的研究核心蛋白聚糖抑制转化生长因子-β1(TGF-β1)诱导的人肾小管上皮细胞.间充质细胞-转分化(EMT)的机制。方法将体外培养的人肾小管上皮细胞(HK-2)分为4组:(1)阴性对照组;(2)100ng/ml核心蛋白聚糖组;(3)10ng/ml TGF-β1组;(4)100ng/ml核心蛋白聚糖和10ng/mlTGF-β1组。Westernblot法检测信号通路ERK、P13K、Smad3的磷酸化水平和β-catenin的蛋白水平;实时定量-PCR检测snailmRNA的表达情况,逆转录-PCR检测淋巴细胞增长因子1(LEF-1)mRNA的表达情况。结果(1)与对照组相比,TGF-β1诱导组ERK(1.11±0.09:0.47±0.07)、P13K(14.79±1.02:2.48±0.06)、Smad,(0.95±0.02:0.08±0.01)的磷酸化水平明显增高,snail(2.59±0.70:1.02±0.13)、LEF-1(1.85±0.08:0.30±0.11)的mRNA的表达鼍明显增高,β—catenin(1.46±0.20:0.49±0.05)的量明显增高;(2)单纯核心蛋白聚糖组与对照组相比,所得结果差异均无统计学意义。核心蛋白聚糖和TGF—β1共同刺激组与TGF-β1组相比,ERK(0.58±0.08)的磷酸化水平及snailmRNA(1.24±0.03)的表达量明显降低而PI3K(15.84±01.64),Smad,(0.90±0.04)的磷酸化水平,LEF—1的mRNA(1.64±0.07)、β-catenin(1.42±0.09)的量差异无统计学意义。结论核心蛋白聚糖抑制TGF-β1诱导的人肾小管上皮细胞EMT可能是通过阻止ERK信号转导通路实现的。Objective To investigate the mechanisms of decorin inhibiting epithelial-tomesenehymal transition (EMT) induced by transforming growth factor β1 (TGF-β1) in renal tubular epithelial cells. Method HK-2 cells in vitro were divided into 4 groups : ( 1 ) negative control group ; (2) decorin group, added with decofin 100 ng/ml ; (3) TGF-β1 group, added with TGF-β1 10 ng/ml; (4) deeorin and TGF-β1 group, added with decofin 100 ng/ml and TGF-β1 10 ng/ml. The protein level of phosphor-ERK, phosphor- PI3K , phosphor- Smad3 and β-eatenin was detected by Western blotting method. The snail mRNA level was tested by real time-PCR, while the lymphoid enhancer factor-1 ( LEF-1 ) mRNA level was measured by RT-PCR. Results The snail ( 2. 59 ± 0. 70:1.02 ± 0. 13 ) and LEF-1 mRNA ( 1.85 - 0. 08: 0. 30±0. 11 ) were significantly up-regulated, meanwhile the protein level of phosphor-ERK( 1.11 ± 0. 09: 0. 47 ± 0. 07 ), phosphor-PI3 K ( 14. 79 ± 1.02:2.48 ± 0. 06 ), phosphor-Smad3 ( 0. 95 ± 0. 02 : 0. 08 ± 0. 01 ) and β-catenin( 1.46 ± 0. 20: 0. 49 ± 0. 05 ) were significantly increased in TGF-β1 group compared to control group, while there were no statistically significant difference in all figures between control group and deeorin group. The phosphor-ERK protein level ( 0. 58 ± 0. 08 ) and the snail mRNA level ( 1.24 ± 0. 03 ) were significantly down-regulated in TGF-β1 and decorin group compared to TGF-β1 group, however there were no statistically significant differences in the level of phosphor-PI3K ( 15.84 ± 1.64 ) , phosphor-Smad3 (0. 90 ± 0. 04 ) and β-catenin ( 1.42 ± 0. 09 ) between these two groups. Conclusion Decorin inhibited EMT induced by TGF-β1 which may be through blocking the ERK signal transduction pathway.

关 键 词:蛋白聚糖类 分化抑制蛋白质类 纤维化 肾脏病学 转化生长因子Β1 

分 类 号:R692[医药卫生—泌尿科学]

 

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