The peripheral nervous system has the potential to regenerate after nerve injury owing to the intrinsic regrowth ability of neurons and the permissive microenvironment.The regenerative process involves numerous gene e...The peripheral nervous system has the potential to regenerate after nerve injury owing to the intrinsic regrowth ability of neurons and the permissive microenvironment.The regenerative process involves numerous gene expression changes,in which transcription factors play a critical role.Previously,we profiled dysregulated genes in dorsal root ganglion neurons at different time points（0,3 and 9 hours,and 1,4 and 7 days） after sciatic nerve injury in rats by RNA sequencing.In the present study,we investigated differentially expressed transcription factors following nerve injury,and we identified enriched molecular and cellular functions of these transcription factors by Ingenuity Pathway Analysis.This analysis revealed the dynamic changes in the expression of transcription factors involved in cell death at different time points following sciatic nerve injury.In addition,we constructed regulatory networks of the differentially expressed transcription factors in cell death and identified some key transcription factors（such as STAT1,JUN,MYC and IRF7）.We confirmed the changes in expression of some key transcription factors（STAT1 and IRF7） by quantitative reverse transcription-polymerase chain reaction.Collectively,our analyses provide a global overview of transcription factor changes in dorsal root ganglia after sciatic nerve injury and offer insight into the regulatory transcription factor networks involved in cell death.展开更多
DOF(DNA binding with one finger)转录因子是植物特有的转录因子家族,含有一个独特的富含Cys残基的单锌指DNA结合区域,在植物生长发育中参与多种生物学过程。本研究根据拟南芥AtDof1.7基因(GenBank登录号为AT1G51700)序列设计含有不同...DOF(DNA binding with one finger)转录因子是植物特有的转录因子家族,含有一个独特的富含Cys残基的单锌指DNA结合区域,在植物生长发育中参与多种生物学过程。本研究根据拟南芥AtDof1.7基因(GenBank登录号为AT1G51700)序列设计含有不同酶切位点的特异性扩增引物,以拟南芥总DNA为模板,扩增AtDof1.7基因片段,将AtDof1.7基因正向反向分别插入表达载体的相应位置,构建成AtDof1.7基因的RNA干扰载体pADOF1。利用改良的floral-dip方法将干扰载体pADOF1成功转入野生型拟南芥,经草甘膦抗性筛选和PCR检测获得5株阳性转基因植株。利用RT-PCR技术和气相色谱法分别分析了AtDof1.7基因的表达和种子脂肪酸组成,结果表明,5株转基因植株中AtDof1.7基因的表达量不同程度低于野生型植株,种子油酸含量明显上升,亚麻酸含量明显下降,说明AtDof1.7转录因子与拟南芥种子脂肪酸代谢途径有一定的关系,为进一步研究其在脂肪酸代谢过程中的调控作用以及在油菜中研究该类转录因子的功能奠定了基础。展开更多
目的探讨沉默转录因子7类似物2(TCF7L2)对胰岛素抵抗(IR)Hep G2细胞胰岛素降解酶(IDE)表达的调控作用及可能机制。方法将Hep G2细胞分为空白组、TCF7L2干扰组、空载体组、IR组、IR+TCF7L2干扰组、IR+空载体组。采用高浓度胰岛素(5×...目的探讨沉默转录因子7类似物2(TCF7L2)对胰岛素抵抗(IR)Hep G2细胞胰岛素降解酶(IDE)表达的调控作用及可能机制。方法将Hep G2细胞分为空白组、TCF7L2干扰组、空载体组、IR组、IR+TCF7L2干扰组、IR+空载体组。采用高浓度胰岛素(5×10-6mol/L)持续作用24h诱导IR模型(IR-Hep G2细胞)生成。以人TCF7L2 m RNA编码序列为干扰靶点构建TCF7L2特异性小干扰RNA慢病毒载体(LV-TCF7L2-si RNA)转染空白组及IR组细胞,空载体病毒转染空载体组及IR+空载体组细胞。q RT-PCR法检测各组细胞TCF7L2及IDE m RNA的表达,Western blotting检测各组细胞TCF7L2、IDE、胰岛素刺激后蛋白激酶B(AKT)、磷酸化蛋白激酶B(p-AKT)蛋白表达的变化,流式细胞术检测各组2-脱氧-D-葡萄糖(2-NBDG)荧光葡萄糖摄取率。结果与空白组比较,IR组细胞葡萄糖消耗量及2-NBDG摄取率均明显降低(P<0.01),证明IR细胞模型建立成功。q RT-PCR及Western blotting结果显示,IR组TCF7L2及IDE m RNA种蛋白表达水平均明显低于空白组(P<0.05),TCF7L2干扰组TCF7L2、IDE m RNA和蛋白表达水平较空白组、空载体组明显下降,IR+TCF7L2干扰组TCF7L2、IDE m RNA和蛋白表达水平较IR组、IR+空载体组均明显下降(P<0.05)。生理剂量胰岛素刺激后,IR组、IR+TCF7L2干扰组p-AKT蛋白水平较空白组明显下降(P<0.01),各组总AKT水平差异无统计学意义。TCF7L2干扰组2-NBDG荧光葡萄糖摄取率较空白组和空载体组明显下降,IR+TCF7L2干扰组2-NBDG荧光葡萄糖摄取率较IR组、IR+空载体组明显下降(P<0.01)。结论 TCF7L2联合IDE致肝细胞IR,其机制可能与减少胰岛素信号通路关键酶p-AKT蛋白的表达有关。展开更多
基金supported by the National Natural Science Foundation of China,No.31500823the Natural Science Foundation of Jiangsu Province of China,No.BK20150403the Natural Science Fund for Colleges and Universities in Jiangsu Province of China,No.16KJB180024
文摘The peripheral nervous system has the potential to regenerate after nerve injury owing to the intrinsic regrowth ability of neurons and the permissive microenvironment.The regenerative process involves numerous gene expression changes,in which transcription factors play a critical role.Previously,we profiled dysregulated genes in dorsal root ganglion neurons at different time points（0,3 and 9 hours,and 1,4 and 7 days） after sciatic nerve injury in rats by RNA sequencing.In the present study,we investigated differentially expressed transcription factors following nerve injury,and we identified enriched molecular and cellular functions of these transcription factors by Ingenuity Pathway Analysis.This analysis revealed the dynamic changes in the expression of transcription factors involved in cell death at different time points following sciatic nerve injury.In addition,we constructed regulatory networks of the differentially expressed transcription factors in cell death and identified some key transcription factors（such as STAT1,JUN,MYC and IRF7）.We confirmed the changes in expression of some key transcription factors（STAT1 and IRF7） by quantitative reverse transcription-polymerase chain reaction.Collectively,our analyses provide a global overview of transcription factor changes in dorsal root ganglia after sciatic nerve injury and offer insight into the regulatory transcription factor networks involved in cell death.
文摘DOF(DNA binding with one finger)转录因子是植物特有的转录因子家族,含有一个独特的富含Cys残基的单锌指DNA结合区域,在植物生长发育中参与多种生物学过程。本研究根据拟南芥AtDof1.7基因(GenBank登录号为AT1G51700)序列设计含有不同酶切位点的特异性扩增引物,以拟南芥总DNA为模板,扩增AtDof1.7基因片段,将AtDof1.7基因正向反向分别插入表达载体的相应位置,构建成AtDof1.7基因的RNA干扰载体pADOF1。利用改良的floral-dip方法将干扰载体pADOF1成功转入野生型拟南芥,经草甘膦抗性筛选和PCR检测获得5株阳性转基因植株。利用RT-PCR技术和气相色谱法分别分析了AtDof1.7基因的表达和种子脂肪酸组成,结果表明,5株转基因植株中AtDof1.7基因的表达量不同程度低于野生型植株,种子油酸含量明显上升,亚麻酸含量明显下降,说明AtDof1.7转录因子与拟南芥种子脂肪酸代谢途径有一定的关系,为进一步研究其在脂肪酸代谢过程中的调控作用以及在油菜中研究该类转录因子的功能奠定了基础。
文摘目的探讨沉默转录因子7类似物2(TCF7L2)对胰岛素抵抗(IR)Hep G2细胞胰岛素降解酶(IDE)表达的调控作用及可能机制。方法将Hep G2细胞分为空白组、TCF7L2干扰组、空载体组、IR组、IR+TCF7L2干扰组、IR+空载体组。采用高浓度胰岛素(5×10-6mol/L)持续作用24h诱导IR模型(IR-Hep G2细胞)生成。以人TCF7L2 m RNA编码序列为干扰靶点构建TCF7L2特异性小干扰RNA慢病毒载体(LV-TCF7L2-si RNA)转染空白组及IR组细胞,空载体病毒转染空载体组及IR+空载体组细胞。q RT-PCR法检测各组细胞TCF7L2及IDE m RNA的表达,Western blotting检测各组细胞TCF7L2、IDE、胰岛素刺激后蛋白激酶B(AKT)、磷酸化蛋白激酶B(p-AKT)蛋白表达的变化,流式细胞术检测各组2-脱氧-D-葡萄糖(2-NBDG)荧光葡萄糖摄取率。结果与空白组比较,IR组细胞葡萄糖消耗量及2-NBDG摄取率均明显降低(P<0.01),证明IR细胞模型建立成功。q RT-PCR及Western blotting结果显示,IR组TCF7L2及IDE m RNA种蛋白表达水平均明显低于空白组(P<0.05),TCF7L2干扰组TCF7L2、IDE m RNA和蛋白表达水平较空白组、空载体组明显下降,IR+TCF7L2干扰组TCF7L2、IDE m RNA和蛋白表达水平较IR组、IR+空载体组均明显下降(P<0.05)。生理剂量胰岛素刺激后,IR组、IR+TCF7L2干扰组p-AKT蛋白水平较空白组明显下降(P<0.01),各组总AKT水平差异无统计学意义。TCF7L2干扰组2-NBDG荧光葡萄糖摄取率较空白组和空载体组明显下降,IR+TCF7L2干扰组2-NBDG荧光葡萄糖摄取率较IR组、IR+空载体组明显下降(P<0.01)。结论 TCF7L2联合IDE致肝细胞IR,其机制可能与减少胰岛素信号通路关键酶p-AKT蛋白的表达有关。
