背景:诱导骨髓基质干细胞成骨条件的优化与探讨是再生医学研究的热点。前期实验发现Wnt7b在骨发育中的作用,此次实验是前期工作的延续。目的:构建Wnt7b重组反转录病毒载体,观察其在C3H10T1/2中的表达。设计、时间及地点:细胞学体外观察,...背景:诱导骨髓基质干细胞成骨条件的优化与探讨是再生医学研究的热点。前期实验发现Wnt7b在骨发育中的作用,此次实验是前期工作的延续。目的:构建Wnt7b重组反转录病毒载体,观察其在C3H10T1/2中的表达。设计、时间及地点:细胞学体外观察,于2005-01/2008-08在华盛顿大学医学院和同济大学附属第十人民医院中心实验室完成。材料:pXy-Wnt7b购于ATCC公司,载体pCIG-IRES-EGFP,pLef-Luciferase,pCMV-Rennilla,反转录病毒载体pSFG和包装细胞GP293由华盛顿大学医学院提供。方法:用多步亚克隆技术构建目的基因Wnt7b和标记基因加强型绿色荧光蛋白(enhanced green fluorescent protein,EGFP)双表达重组反转录病毒载体pSFG-Wnt7b-IRES-EGFP,在条件培养液中经GP293包装,并在常规培养液中释放出假病毒并将其转染C3H10T1/2细胞,检测成骨活性诱导中的作用和荧光素酶报告基因检测信号转导通路。主要观察指标:①Wnt7b重组反转录病毒转染C3H10T1/2细胞的表达。②Wnt7b诱导C3H10T1/2碱性磷酸酶生成分析。③Wnt7b信号转导分析。结果:构建目的基因的Wnt7b和标记基因EGFP双表达重组反转录病毒载体能够高效地表达,转染C3H10T1/2细胞后能诱导碱性磷酸酶的生成。Wnt7b信号转导分析可见Wnt7b成骨作用通过Noncanonical途径。结论:Wnt7b在C3H10T1/2中能高效表达,能显著诱导骨发育的重要标志--碱性磷酸酶的生成,Noncanonical途径在其中起重要作用。展开更多
Objective： To investigate the role of peroxisome proliferator-activated receptors δ （PPARδ） in inflammatory reaction and its possible mechanism in adipocyte. Methods：Lentivirus-mediated RNA interference （RNAi）...Objective： To investigate the role of peroxisome proliferator-activated receptors δ （PPARδ） in inflammatory reaction and its possible mechanism in adipocyte. Methods：Lentivirus-mediated RNA interference （RNAi） was used to block the expression of PPARδ in 3T3-L1 cells. In order to induce inflammation in 3T3-L1, cells were stimulated with tumor necrosis factor-α（TNFα, 20 ng/ml） for 4 h. The expression of PPARδ, nuclear factor κB （NFκB） and C reactive protein （CRP） were determined by Western blot analysis. Results：The expression of PPARδ was reduced by 80% after RNAi. Blockage of PPARδ promoted the expression of CRP and NFκB in cells stimulated with TNFα but had no effect on normal cells. Conclusion： PPARδ is involved in inflammatory reaction in adipocyte. Blockage of PPARδ can promote the inflammation mediated by inflammatory factors and increase the expression of NFκB and CRP in 3T3-L1 cells stimulated with TNFα.展开更多
文摘背景:诱导骨髓基质干细胞成骨条件的优化与探讨是再生医学研究的热点。前期实验发现Wnt7b在骨发育中的作用,此次实验是前期工作的延续。目的:构建Wnt7b重组反转录病毒载体,观察其在C3H10T1/2中的表达。设计、时间及地点:细胞学体外观察,于2005-01/2008-08在华盛顿大学医学院和同济大学附属第十人民医院中心实验室完成。材料:pXy-Wnt7b购于ATCC公司,载体pCIG-IRES-EGFP,pLef-Luciferase,pCMV-Rennilla,反转录病毒载体pSFG和包装细胞GP293由华盛顿大学医学院提供。方法:用多步亚克隆技术构建目的基因Wnt7b和标记基因加强型绿色荧光蛋白(enhanced green fluorescent protein,EGFP)双表达重组反转录病毒载体pSFG-Wnt7b-IRES-EGFP,在条件培养液中经GP293包装,并在常规培养液中释放出假病毒并将其转染C3H10T1/2细胞,检测成骨活性诱导中的作用和荧光素酶报告基因检测信号转导通路。主要观察指标:①Wnt7b重组反转录病毒转染C3H10T1/2细胞的表达。②Wnt7b诱导C3H10T1/2碱性磷酸酶生成分析。③Wnt7b信号转导分析。结果:构建目的基因的Wnt7b和标记基因EGFP双表达重组反转录病毒载体能够高效地表达,转染C3H10T1/2细胞后能诱导碱性磷酸酶的生成。Wnt7b信号转导分析可见Wnt7b成骨作用通过Noncanonical途径。结论:Wnt7b在C3H10T1/2中能高效表达,能显著诱导骨发育的重要标志--碱性磷酸酶的生成,Noncanonical途径在其中起重要作用。
文摘Objective： To investigate the role of peroxisome proliferator-activated receptors δ （PPARδ） in inflammatory reaction and its possible mechanism in adipocyte. Methods：Lentivirus-mediated RNA interference （RNAi） was used to block the expression of PPARδ in 3T3-L1 cells. In order to induce inflammation in 3T3-L1, cells were stimulated with tumor necrosis factor-α（TNFα, 20 ng/ml） for 4 h. The expression of PPARδ, nuclear factor κB （NFκB） and C reactive protein （CRP） were determined by Western blot analysis. Results：The expression of PPARδ was reduced by 80% after RNAi. Blockage of PPARδ promoted the expression of CRP and NFκB in cells stimulated with TNFα but had no effect on normal cells. Conclusion： PPARδ is involved in inflammatory reaction in adipocyte. Blockage of PPARδ can promote the inflammation mediated by inflammatory factors and increase the expression of NFκB and CRP in 3T3-L1 cells stimulated with TNFα.
