目的研究线粒体融合素基因-2(mitofusin-2,Mfn2)沉默对人肝癌细胞株(HepG2)葡萄糖代谢和胰岛素信号通路分子丝/苏氨酸蛋白激酶(Akt1)的影响。方法构建Mfn2短发夹双链RNA(Mfn2shRNA)和阴性对照短发夹双链RNA(HK),将HepG2细胞株分为空白...目的研究线粒体融合素基因-2(mitofusin-2,Mfn2)沉默对人肝癌细胞株(HepG2)葡萄糖代谢和胰岛素信号通路分子丝/苏氨酸蛋白激酶(Akt1)的影响。方法构建Mfn2短发夹双链RNA(Mfn2shRNA)和阴性对照短发夹双链RNA(HK),将HepG2细胞株分为空白对照组(NC)、阴性对照组(HK)、Mfn2shRNA质粒转染组(Mfn2)。HK和Mfn2组细胞应用lipo-fectamine2000转染HepG2细胞株;采用葡萄糖氧化酶的方法和氚标记葡萄糖(3-3H-Glucose)放射性核素示踪法检测细胞葡萄糖消耗量和摄取率;Western blotting检测Mfn2和Akt1蛋白表达。结果与HK组比较,Mfn2组细胞Mfn2蛋白表达明显下降(0.23±0.05 vs 0.51±0.14,P=0.034),Akt1表达差异无统计学意义(0.13±0.00 vs 0.14±0.01,P=0.055);Mfn2组细胞葡萄糖消耗量明显下降(8.72±0.62 vs 9.75±0.35,P=0.001),葡萄糖摄取率亦显著下降(7.94±0.04 vs 9.64±0.13,P=0.002)。结论抑制Mfn2基因表达导致HepG2细胞葡萄糖代谢下降;Mfn2表达对葡萄糖代谢的影响是否通过PI3K/Akt信号通路介导还需要进一步研究。展开更多
[Objective] This study aimed to obtain recombinant alpha-bungarotoxin (a-BG-0 gene fusion protein with biological activity and investiagte its fusion expression. [Method] The plasmid pGEX-a-BGT was transformed into E...[Objective] This study aimed to obtain recombinant alpha-bungarotoxin (a-BG-0 gene fusion protein with biological activity and investiagte its fusion expression. [Method] The plasmid pGEX-a-BGT was transformed into E coil BL21 (DE3) and BL21 (DE3) plysS host bacteria to identify the optimal engineering strain. Fusion expression of the optimal engineering strain was induced, in order to optimize the induced expression conditions of the soluble fusion protein. [Result] JP-a-BGT was identified as the optimal engineering strain, which could express fusion protein after induced by IPTG. The optimal induced expression conditions of the soluble fusion protein were investigatect JP-a-BGT was incubated at 37 ℃ for 2.5 h and induced with 0.50 mmol4. IPTG for 4 h at 22 ℃, and the expression level of the soluble fusion protein reached 18.42%. [Conclusion] This study laid a solid foundation for the subsequent purification of fusion proteins and the separation and purification of a-BGT.展开更多
文摘目的研究线粒体融合素基因-2(mitofusin-2,Mfn2)沉默对人肝癌细胞株(HepG2)葡萄糖代谢和胰岛素信号通路分子丝/苏氨酸蛋白激酶(Akt1)的影响。方法构建Mfn2短发夹双链RNA(Mfn2shRNA)和阴性对照短发夹双链RNA(HK),将HepG2细胞株分为空白对照组(NC)、阴性对照组(HK)、Mfn2shRNA质粒转染组(Mfn2)。HK和Mfn2组细胞应用lipo-fectamine2000转染HepG2细胞株;采用葡萄糖氧化酶的方法和氚标记葡萄糖(3-3H-Glucose)放射性核素示踪法检测细胞葡萄糖消耗量和摄取率;Western blotting检测Mfn2和Akt1蛋白表达。结果与HK组比较,Mfn2组细胞Mfn2蛋白表达明显下降(0.23±0.05 vs 0.51±0.14,P=0.034),Akt1表达差异无统计学意义(0.13±0.00 vs 0.14±0.01,P=0.055);Mfn2组细胞葡萄糖消耗量明显下降(8.72±0.62 vs 9.75±0.35,P=0.001),葡萄糖摄取率亦显著下降(7.94±0.04 vs 9.64±0.13,P=0.002)。结论抑制Mfn2基因表达导致HepG2细胞葡萄糖代谢下降;Mfn2表达对葡萄糖代谢的影响是否通过PI3K/Akt信号通路介导还需要进一步研究。
文摘[Objective] This study aimed to obtain recombinant alpha-bungarotoxin (a-BG-0 gene fusion protein with biological activity and investiagte its fusion expression. [Method] The plasmid pGEX-a-BGT was transformed into E coil BL21 (DE3) and BL21 (DE3) plysS host bacteria to identify the optimal engineering strain. Fusion expression of the optimal engineering strain was induced, in order to optimize the induced expression conditions of the soluble fusion protein. [Result] JP-a-BGT was identified as the optimal engineering strain, which could express fusion protein after induced by IPTG. The optimal induced expression conditions of the soluble fusion protein were investigatect JP-a-BGT was incubated at 37 ℃ for 2.5 h and induced with 0.50 mmol4. IPTG for 4 h at 22 ℃, and the expression level of the soluble fusion protein reached 18.42%. [Conclusion] This study laid a solid foundation for the subsequent purification of fusion proteins and the separation and purification of a-BGT.