Amh (anti-Müllerian hormone) is a single copy gene which is expressed strongly in Sertoli cells in the foetal testis and participates in the onset of sexual differentiation. Its promoter driving the expression of...Amh (anti-Müllerian hormone) is a single copy gene which is expressed strongly in Sertoli cells in the foetal testis and participates in the onset of sexual differentiation. Its promoter driving the expression of a reporter gene (d2EGFP) has been used to analyse the role of certain defined putative elements and a downstream enhancer element in gene expression. These experiments were carried out in vitro using a line of pre-pubertal mouse Sertoli cells, transienly transfected with circular DNA constructs with variously mutated promoter elements. A downstream enhancer element, situated immediately 3’ of the polyadenylation (PA) signal for Amh, has been inserted in an equivalent position in the d2EGFP construct. When the Amh promoter is unmodified, the downstream enhancer (DE) is positively associated with a large increase in EGFP expression. This is at least partly the consequence of an increased rate of expression by individual cells. Experiments using variously truncated Amh promoters indicate that an upstream region (-214 to -336) may play a minor role in facilitating enhancement. However mutation of the Wilms tumour factor-1 element, situated between the tata box and the start of translation, results in an almost complete suppression of enhancement.展开更多
目的甘丙肽受体1(galanin receptor 1,GALR1)信号通路在痛觉调节中发挥重要作用,该研究利用坐骨神经慢性压迫(chronic constriction injury of the sciatic nerve,CCI)大鼠模型,探索慢病毒介导的DREAM沉默治疗在CCI模型大鼠疼痛中的作...目的甘丙肽受体1(galanin receptor 1,GALR1)信号通路在痛觉调节中发挥重要作用,该研究利用坐骨神经慢性压迫(chronic constriction injury of the sciatic nerve,CCI)大鼠模型,探索慢病毒介导的DREAM沉默治疗在CCI模型大鼠疼痛中的作用及其对GALR1的表达调控。方法选择健康雄性SD大鼠24只,随机分为4组(n=6):即RNA干扰组、空白载体组、单纯CCI组和正常对照组。鞘内置管前后分别测定基础痛阈,RNA干扰组和空白载体组于CCI后经微导管给予pKCSHR-Puro/GFP-DREAM慢病毒和空白载体,并测定腰段脊髓内下游调控元件拮抗分子(downstream regulatory element antagonist,DREAM)和GALR1的蛋白表达。结果大鼠痛阈的变化:手术同侧热痛阈和机械痛阈测定结果表明,CCI处理后,RNA干扰组、空白载体组及单纯CCI组在各个时间点热痛阈和机械痛阈较正常对照组均显著降低(P<0.01);RNA干扰组鞘内注射后较注射前痛阈显著升高,治疗后相同时间点RNA干扰组较空白载体组及单纯CCI组痛阈亦显著升高。Western blotting结果表明,与其他实验组对比,RNA干扰组的DREAM蛋白表达水平显著下调,而GALR1蛋白表达水平较空白载体组、单纯CCI组亦有显著下调。结论 DREAM可以调控GALR1的表达,提示甘丙肽受体1信号通路参与DREAM基因调节大鼠神经病理性疼痛。展开更多
文摘Amh (anti-Müllerian hormone) is a single copy gene which is expressed strongly in Sertoli cells in the foetal testis and participates in the onset of sexual differentiation. Its promoter driving the expression of a reporter gene (d2EGFP) has been used to analyse the role of certain defined putative elements and a downstream enhancer element in gene expression. These experiments were carried out in vitro using a line of pre-pubertal mouse Sertoli cells, transienly transfected with circular DNA constructs with variously mutated promoter elements. A downstream enhancer element, situated immediately 3’ of the polyadenylation (PA) signal for Amh, has been inserted in an equivalent position in the d2EGFP construct. When the Amh promoter is unmodified, the downstream enhancer (DE) is positively associated with a large increase in EGFP expression. This is at least partly the consequence of an increased rate of expression by individual cells. Experiments using variously truncated Amh promoters indicate that an upstream region (-214 to -336) may play a minor role in facilitating enhancement. However mutation of the Wilms tumour factor-1 element, situated between the tata box and the start of translation, results in an almost complete suppression of enhancement.
文摘目的甘丙肽受体1(galanin receptor 1,GALR1)信号通路在痛觉调节中发挥重要作用,该研究利用坐骨神经慢性压迫(chronic constriction injury of the sciatic nerve,CCI)大鼠模型,探索慢病毒介导的DREAM沉默治疗在CCI模型大鼠疼痛中的作用及其对GALR1的表达调控。方法选择健康雄性SD大鼠24只,随机分为4组(n=6):即RNA干扰组、空白载体组、单纯CCI组和正常对照组。鞘内置管前后分别测定基础痛阈,RNA干扰组和空白载体组于CCI后经微导管给予pKCSHR-Puro/GFP-DREAM慢病毒和空白载体,并测定腰段脊髓内下游调控元件拮抗分子(downstream regulatory element antagonist,DREAM)和GALR1的蛋白表达。结果大鼠痛阈的变化:手术同侧热痛阈和机械痛阈测定结果表明,CCI处理后,RNA干扰组、空白载体组及单纯CCI组在各个时间点热痛阈和机械痛阈较正常对照组均显著降低(P<0.01);RNA干扰组鞘内注射后较注射前痛阈显著升高,治疗后相同时间点RNA干扰组较空白载体组及单纯CCI组痛阈亦显著升高。Western blotting结果表明,与其他实验组对比,RNA干扰组的DREAM蛋白表达水平显著下调,而GALR1蛋白表达水平较空白载体组、单纯CCI组亦有显著下调。结论 DREAM可以调控GALR1的表达,提示甘丙肽受体1信号通路参与DREAM基因调节大鼠神经病理性疼痛。
