Ryanodine受体介导钙信号调控成髓鞘细胞分化发育的作用机制研究

项目名称： Ryanodine受体介导钙信号调控成髓鞘细胞分化发育的作用机制研究

项目编号： No.31271467

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 生物科学

项目作者： 李红丽

作者单位： 中国人民解放军第三军医大学

项目金额： 80万元

中文摘要： 钙信号参与髓鞘发育与损伤等过程已有众多实验证实。Ryanodine受体(RyR)是胞内Ca2+调控的重要通道，在少突胶质细胞(OL)其发育、功能应答特征及作用尚不清楚。研究显示胞内Ca2+可通过拮抗经典Wnt途径调控少突胶质前体细胞（OPC）向OLs分化，结合前期工作发现RyR在OL早期阶段性高表达及阻断其功能影响OL分化的观察，我们推测RyR介导钙信号是OPCs分化启动的重要调控环节，该过程可能经由Wnt途径介导。课题拟从离体与在体两方面，观察OPC/OL分化发育中RyR功能应答特征和钙波传递模式，和其它钙通道的相互作用；结合药理调控及基因干扰、过表达等技术，研究RyR启动钙信号对Wnt信号途径和OL定向分化转录因子的调节；通过在体发育和脱髓鞘模型，探讨RyR功能活动对髓鞘发育的影响。结果将有助于阐明成髓鞘细胞分化发育的钙信号调节机制，为以钙通道为靶点的脱髓鞘疾病治疗策略提供新线索。

中文关键词： 少突胶质细胞；髓鞘形成；Ryanodine受体；钙信号；钙成像

英文摘要： It has been demonstrated that calcium signaling is involved in the process of myelination and demyelination injuries. Ryanodine receptors(RyRs) are important channels responsible for the regulation of intracellular Ca2+ . But to date it remains elusive about its development, function response characteristics and role in the non-excitable oligodendrocytes(OLs). Studies have shown that intracellular calcium signal has a regulative role during early development events by antagonizing the Wnt/β-catenin pathways. Based on our preliminary work that RyR3 is highly expressed in the early stage of OL and the differentiation is interfered after blocking RyR channel,we speculate that RyR mediated calcium signaling plays a significant onset role in the differentiation of oligodendrocyte progenitor cells(OPCs) towards OLs, and the process may be mediated by the Wnt pathway.In the present project, we will investigate the spatio-temporal expression changes of RyRs, its functional responsive feature and three-dimensional calcium wave transmission mode, by establishing the purified OLs culture system (myelin development) in vitro and demyelination model in vivo.And the interaction between RyR and its associated calcium channels will also be examined. Then the influence of RyR mediated calcium signal on the Wnt/β-catenin pathway

英文关键词： oligodendrocyte；myelination；Ryanodine receptor；calcium signal；Ca2+ imaging