项目名称: miR-29a调控PTEN-Akt/Wnt-β-catenin通路促进轴突伸长和神经干细胞增殖修复脊髓损伤的机制
项目编号: No.81471263
项目类型: 面上项目
立项/批准年度: 2015
项目学科: 医药、卫生
项目作者: 刘锦波
作者单位: 苏州大学
项目金额: 70万元
中文摘要: 脊髓损伤缺乏有效的治疗方法,神经干细胞是治疗脊髓损伤的一个重要手段,但对内源性神经修复的调控缺乏深入研究。近年发现,PTEN通过Akt通路调控神经干细胞增殖分化和神经元轴突伸长。磷酸化Akt能抑制GSK-3β活性,减少β-catenin降解,使胞质中β-catenin积累,激活β-catenin通路,促进神经干细胞增殖分化。miR-29a通过抑制PTEN,激活Akt和β-catenin通路。我们推测miR-29a抑制PTEN,调控Akt和β-catenin通路能促进神经元轴突伸长和神经干细胞增殖。为此项目组在前期工作基础上,从在体、细胞和分子三个水平开展研究,通过细胞转染、免疫共沉淀、Pull down assay、RNAi和点突变等技术,以miR-29a抑制PTEN为切入点探讨Akt和β-catenin通路对脊髓损伤后内源性神经修复的调控机制,为脊髓损伤治疗提供新的理论依据。
中文关键词: 脊髓损伤;神经干细胞;轴突再生;miRNA;PTEN
英文摘要: Spinal cord injury has no effective treatments. Neural stem cells are one of the important methods, but lack of systematic research of the endogenous nerve repairment. Presently studies show that PTEN can regulate neural stem cells proliferation and axons outgrowth. Akt phosphorylation inhibites the activity of GSK-3β,reduces the degradation of β-catenin. As a result, β-catenin pathway is activated to promoting neural stem cells proliferation via β-catenin accumulated in the cytoplasm. These processes may be regulated by miR-29a. On the basis of preliminary work, this research may explore the mechanism of endogenous nerve repairment regulated by Akt and β-catenin pathways after spinal cord injury at the molecular level,in vitro cellular level and the level of model organism by the cell transfection, immune coprecipitation, Pull down assay, RNAi and point mutation techniques, and provide a theoretical basis for nerve repairement.
英文关键词: spinal cord injury;neural stem cell;axon outgrowth;miRNA;PTEN