Dev Cell:东南大学韩俊海课题组发表Neurexin调控L4神经元轴突导向分子机制研究成果

2017-04-06 佚名 生物帮

日前,国际著名学术杂志《Cell》子刊《Developmental Cell》杂志在线发表了东南大学生命科学研究院“发育与疾病相关基因”教育部重点实验室韩俊海课题组题为Neurexin Restricts Axonal Branching in Columns by Promoting Ephrin Clustering的研究工作,博士研究生刘丽娜和田垚博士为论文共同第一作者,韩俊海研究员为论文通

日前,国际著名学术杂志《Cell》子刊《Developmental Cell》杂志在线发表了东南大学生命科学研究院“发育与疾病相关基因”教育部重点实验室韩俊海课题组题为Neurexin Restricts Axonal Branching in Columns by Promoting Ephrin Clustering的研究工作,博士研究生刘丽娜和田垚博士为论文共同第一作者,韩俊海研究员为论文通讯作者。

中枢神经系统和外周神经系统中的很多神经元往往以分层分束的形式进行排列。这种排列方式有助于对外界刺激信号的时间和空间信息进行高保真地传递。然而如何在狭小和紧密的空间内保持神经元成束排列的机制还不清楚。本研究以果蝇的视觉系统为模型,探索了细胞黏附分子Neurexin在限制L4神经元轴突分枝成束排列过程中的作用。研究首先揭示了L4神经元缺失Neurexin会削弱轴突导向分子Ephrin在细胞膜上的聚集,进而导致其轴突分枝异常投射到邻近的神经束中;研究接着阐明了Neurexin通过其胞内端与Ephrin相互结合并促进Ephrin在细胞膜上聚集的作用机制;研究最后还揭示了L4神经元下游的Tm2神经元表达的Neuroligin 4分子起始了L4神经元上的Neurexin分子的募集,随后促进了L4神经元中Ephrin的聚集;Ephrin与邻近L4神经元上的Eph分子协同作用限制了L4神经元轴突分枝的成束排列。该研究不仅揭示了Ephrin/Eph信号通路在神经元成束排列过程中的作用,而且阐明了Neurexin在神经元轴突导向和突触形成两个连续事件中的联系。

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    2017-06-29 维他命
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    2017-08-09 fzwish20000