新型多肽AMPP2在TGF-β1诱导的系膜细胞增殖中的作用及其机制

Effects and mechanism of AMPP2 on mesangial cell proliferation induced by TGF-β1

目的 探究新型多肽AMPP2在转化生长因子β1(TGF-β1)诱导的小鼠系膜细胞增殖中的作用及相关机制。方法 体外用TGF-β1(10μg/L)及AMPP2(10 ng/L)干预系膜细胞,分为Control组、AMPP2组、TGF-β1组及TGF-β1+AMPP2组。CCK-8法检测各组系膜细胞增殖活力;Western blot法检测各组细胞周期蛋白依赖性激酶(CDK)-4、CDK-6、细胞增殖核抗原(PCNA)、α平滑肌肌动蛋白(α-SMA)、Ⅰ型胶原蛋白(COL-Ⅰ)、纤维连接蛋白(FN)及磷酸化的SMAD同源物3/SMAD同源物3(p-SMAD3/SMAD3)的蛋白表达水平;qPCR法检测各组α-SMA、COL-Ⅰ、FN的m RNA表达水平。结果 与Control组相比,TGF-β1组系膜细胞增殖活力增加(P<0.05),与TGF-β1组相比,TGF-β1+AMPP2组系膜细胞增殖活力下降(P<0.05);与Control组相比,TGF-β1组CDK-4、CDK-6、PCNA蛋白以及α-SMA、COL-Ⅰ、FN蛋白和mRNA表达水平升高(P<0.05),与TGF-β1组相比,TGF-β1+AMPP2组上述蛋白及mRNA表达水平均下降(P<0.05);与Control组相比,TGF-β1组p-SMAD3/SMAD3水平显著升高(P<0.05),与TGF-β1组相比,TGF-β1+AMPP2组p-SMAD3/SMAD3的蛋白表达量显著降低(P<0.05)。结论 AMPP2可能通过调控TGF-β1/SMAD3通路抑制系膜细胞增殖。

Objective To explore the effect and mechanism of anti-mesangial cell-proliferation-peptide 2(AMPP2)on mesangial cell proliferation induced by transforming growth factorβ1(TGF-β1).Methods Mesangial cells were cultured in vitro and treated with TGF-β1(10µg/L)and AMPP2(10 ng/L).According to different intervention factors,mesangial cells were divided into four groups:the control group,the AMPP2 group,the TGF-β1 group and the TGF-β1+AMPP2 group.The proliferation activity of mesangial cells was detected by CCK-8.The relative protein expression of cyclin dependent kinase 4(CDK-4),cyclin dependent kinase 6(CDK-6),proliferating cell nuclear antigen(PCNA),α-smooth muscle actin(α-SMA),collagen-Ⅰ(COL-Ⅰ)and fibronectin(FN)were examined by Western blot assay.The relative mRNA expression ofα-SMA,COL-Ⅰand FN were detected by qPCR.Results Compared with the control group,proliferation activity of mesangial cells was significantly increased in the TGF-β1 group(P<0.05).The proliferation activity of mesangial cells was markedly decreased in the TGF-β1+AMPP2 group compared with that of the TGF-β1 group(P<0.05).Compared with the control group,protein levels of CDK-4,CDK-6,PCNA,α-SMA,COL-Ⅰand FN in cells were significantly increased in the TGF-β1 group(P<0.05),as well as the mRNA levels ofα-SMA,COL-Ⅰand FN(P<0.05).In the TGF-β1+AMPP2 group,the protein and mRNA levels ofα-SMA,COL-Ⅰand FN and the protein levels of CDK-4,CDK-6 and PCNA were markedly decreased compared with those of the TGF-β1 group(P<0.05).Compared with the control group,levels of p-SMAD3/SMAD3 was remarkably upregulated in the TGF-β1 group(P<0.05),while levels of p-SMAD3/SMAD3 was remarkably downregulated in the TGF-β1+AMPP2 group compared with those of the TGF-β1 group(P<0.05).Conclusion AMPP2 may inhibit mesangial cell proliferation by regulating TGF-β1/SMAD3 pathway.