目的:观察Kindlin-2 RNA干扰(RNA interference,RNAi)对大鼠血管平滑肌细胞(vascular smooth muscle cell,VSMC)增殖的影响并探讨相关的作用机制。方法:构建并制备Kindlin-2 siRNA慢病毒载体并感染大鼠VSMC,CCK-8和BrdU技术检测重组Wnt3...目的:观察Kindlin-2 RNA干扰(RNA interference,RNAi)对大鼠血管平滑肌细胞(vascular smooth muscle cell,VSMC)增殖的影响并探讨相关的作用机制。方法:构建并制备Kindlin-2 siRNA慢病毒载体并感染大鼠VSMC,CCK-8和BrdU技术检测重组Wnt3a蛋白诱导的VSMC增殖情况,实时定量PCR测定VSMC中Kindlin-2、c-Myc和cyclin D1 mRNA的表达水平,免疫共沉淀了解Kindlin-2和β-catenin的关系,Western blot检测VSMC中Kindlin-2、β-catenin、磷酸化β-catenin(Ser675)、GSK-3β和磷酸化GSK-3β(Ser9)蛋白的表达。结果:Kindlin-2 siRNA慢病毒载体能有效感染大鼠VSMC。CCK-8和BrdU结果表明Kindlin-2 RNAi能够显著抑制Wnt3a诱导的VSMC增殖(1.12±0.14 vs. 2.25±0.15,P=0.000;0.162±0.017 vs. 0.288±0.019,P=0.000)。与阴性对照组相比,Kindlin-2 RNAi组和Kindlin-2 RNAi+Wnt3a组中Kindlin-2、c-Myc和cyclin D1 mRNA表达水平均明显下降(0.964±0.014 vs. 0.530±0.029,P=0.000;0.980±0.025 vs. 0.572±0.022,P=0.000;0.979±0.009 vs. 0.590±0.035,P=0.002和0.964±0.014 vs. 0.569±0.027,P=0.000;0.980±0.025 vs. 0.741±0.026,P=0.001;0.979±0.009 vs. 0.769±0.017,P=0.023)。免疫共沉淀证实VSMC中Kindlin-2可以与β-catenin结合,而且Kindlin-2 RNAi+Wnt3a组中Kindlin-2、磷酸化β-catenin(Ser675)和磷酸化GSK-3β(Ser9)蛋白的表达水平较阴性对照+Wnt3a组明显降低(0.468±0.029 vs. 0.725±0.033,P=0.001;1.058±0.109 vs. 1.478±0.045,P=0.001;0.624±0.048 vs. 0.809±0.067,P=0.020)。但各组中总β-catenin和总GSK-3β蛋白水平没有明显变化(F=0.638,P=0.647;F=0.781,P=0.563)。结论:Kindlin-2 RNAi可以通过Wnt信号通路发挥作用并抑制VSMC增殖。展开更多
OBJECTIVE: To study the features of vascular smooth muscle cell (VSMC) proliferation induced by endothelin-1 (ET-1). METHODS: VSMCs of spontaneously hypertensive rats (SHR) and Wistar-Kyoto rats were cultured and trea...OBJECTIVE: To study the features of vascular smooth muscle cell (VSMC) proliferation induced by endothelin-1 (ET-1). METHODS: VSMCs of spontaneously hypertensive rats (SHR) and Wistar-Kyoto rats were cultured and treated with ET-1. Basic fibroblast growth factor (bFGF) gene expression was measured using both Northern blot and an enzyme-linked immunoassay. RESULTS: ET-1 resulted in an increase in bFGF transcripts at 8 - 24 h; bFGF levels were significantly higher in VSMCs treated with ET-1 than in those not treated. However, VSMCs growth responses in SHR and WKY were different. Smooth muscle cells of SHR were hyper-responsive to ET-1. Maximal bFGF mRNA levels were elevated 3.5-fold at 4 h of stimulation in WKY and 8-fold at 8h in SHR4. Moreover, the proliferation of VSMCs induced by ET-1 was inhibited by antisense phosphorothioate oligodeoxynucleotides (10 micromol/L AS-bFGF) but not sense bFGF oligomers at the same concentrations, being reduced by 80% in SHR and 40% in WKY vs control, respectively. Furthermore, the effect of AS-bFGF oligomers on SHR SMC proliferation is significantly greater than on WKY SMC proliferation. CONCLUSION: ET-1 may be required for exaggerated vascular growth responses in SHR and bFGF may be involved.展开更多
文摘目的:观察Kindlin-2 RNA干扰(RNA interference,RNAi)对大鼠血管平滑肌细胞(vascular smooth muscle cell,VSMC)增殖的影响并探讨相关的作用机制。方法:构建并制备Kindlin-2 siRNA慢病毒载体并感染大鼠VSMC,CCK-8和BrdU技术检测重组Wnt3a蛋白诱导的VSMC增殖情况,实时定量PCR测定VSMC中Kindlin-2、c-Myc和cyclin D1 mRNA的表达水平,免疫共沉淀了解Kindlin-2和β-catenin的关系,Western blot检测VSMC中Kindlin-2、β-catenin、磷酸化β-catenin(Ser675)、GSK-3β和磷酸化GSK-3β(Ser9)蛋白的表达。结果:Kindlin-2 siRNA慢病毒载体能有效感染大鼠VSMC。CCK-8和BrdU结果表明Kindlin-2 RNAi能够显著抑制Wnt3a诱导的VSMC增殖(1.12±0.14 vs. 2.25±0.15,P=0.000;0.162±0.017 vs. 0.288±0.019,P=0.000)。与阴性对照组相比,Kindlin-2 RNAi组和Kindlin-2 RNAi+Wnt3a组中Kindlin-2、c-Myc和cyclin D1 mRNA表达水平均明显下降(0.964±0.014 vs. 0.530±0.029,P=0.000;0.980±0.025 vs. 0.572±0.022,P=0.000;0.979±0.009 vs. 0.590±0.035,P=0.002和0.964±0.014 vs. 0.569±0.027,P=0.000;0.980±0.025 vs. 0.741±0.026,P=0.001;0.979±0.009 vs. 0.769±0.017,P=0.023)。免疫共沉淀证实VSMC中Kindlin-2可以与β-catenin结合,而且Kindlin-2 RNAi+Wnt3a组中Kindlin-2、磷酸化β-catenin(Ser675)和磷酸化GSK-3β(Ser9)蛋白的表达水平较阴性对照+Wnt3a组明显降低(0.468±0.029 vs. 0.725±0.033,P=0.001;1.058±0.109 vs. 1.478±0.045,P=0.001;0.624±0.048 vs. 0.809±0.067,P=0.020)。但各组中总β-catenin和总GSK-3β蛋白水平没有明显变化(F=0.638,P=0.647;F=0.781,P=0.563)。结论:Kindlin-2 RNAi可以通过Wnt信号通路发挥作用并抑制VSMC增殖。
文摘OBJECTIVE: To study the features of vascular smooth muscle cell (VSMC) proliferation induced by endothelin-1 (ET-1). METHODS: VSMCs of spontaneously hypertensive rats (SHR) and Wistar-Kyoto rats were cultured and treated with ET-1. Basic fibroblast growth factor (bFGF) gene expression was measured using both Northern blot and an enzyme-linked immunoassay. RESULTS: ET-1 resulted in an increase in bFGF transcripts at 8 - 24 h; bFGF levels were significantly higher in VSMCs treated with ET-1 than in those not treated. However, VSMCs growth responses in SHR and WKY were different. Smooth muscle cells of SHR were hyper-responsive to ET-1. Maximal bFGF mRNA levels were elevated 3.5-fold at 4 h of stimulation in WKY and 8-fold at 8h in SHR4. Moreover, the proliferation of VSMCs induced by ET-1 was inhibited by antisense phosphorothioate oligodeoxynucleotides (10 micromol/L AS-bFGF) but not sense bFGF oligomers at the same concentrations, being reduced by 80% in SHR and 40% in WKY vs control, respectively. Furthermore, the effect of AS-bFGF oligomers on SHR SMC proliferation is significantly greater than on WKY SMC proliferation. CONCLUSION: ET-1 may be required for exaggerated vascular growth responses in SHR and bFGF may be involved.
文摘目的以RNA干扰抑制血管平滑肌细胞(vascular smooth muscle cells,VSMCs)的c-Jun基因表达,探讨其表达抑制后VSMCs增殖的变化。方法设对照组(VSMCs不作处理)、阴性si RNA组(VSMCs转染无关序列的si RNA)及c-Jun si RNA组(VSMCs转染c-Jun si RNA)。应用RT-PCR半定量法检测VSMCs中c-Jun的mRNA水平,Western blot法检测VSMCs中c-Jun的蛋白水平,应用MTT比色法及3H-TdR掺入法检测VSMCs的增殖情况,流式细胞仪检测VSMCs的细胞周期变化。结果c-Jun si RNA组的c-Jun mRNA及蛋白表达水平均较对照组明显降低(P<0.05,P<0.01),而阴性si RNA组与对照组间差异无统计学意义(P>0.05)。c-Jun si RNA组VSMCs的增殖活性较对照组明显降低(P<0.05),细胞周期出现明显的G0/G1期阻滞;而阴性si RNA组与对照组间差异无统计学意义(P>0.05)。结论RNA干扰介导的c-Jun基因沉默可显著抑制VSMCs的体外增殖。
