Actin Aggregations Mark the Sites of Neurite Initiation

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• 作者：Shu-Xin Zhang ; Li-Hui Duan ; Hong Qian ; Xiang Yu
• 关键词：Neurite initiation ; Neuritogenesis ; Actin aggregations ; Actin ; Microtubules
• 刊名：Neuroscience Bulletin
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：32
• 期：1
• 页码：1-15
• 全文大小：2,802 KB
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• 作者单位：Shu-Xin Zhang (1) (2)
  Li-Hui Duan (1) (2)
  Hong Qian (3)
  Xiang Yu (1)
  
  1. Institute of Neuroscience, State Key Laboratory of Neuroscience, CAS Center for Excellence in Brain Science and Intelligence Technology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200031, China
  2. University of the Chinese Academy of Sciences, Beijing, 100049, China
  3. Department of Applied Mathematics, University of Washington, Seattle, Washington, 98195, USA
  
• 刊物主题：Neurosciences; Human Physiology; Anesthesiology; Anatomy; Neurology; Pain Medicine;
• 出版者：Springer Berlin Heidelberg
• ISSN：1995-8218

文摘

A salient feature of neurons is their intrinsic ability to grow and extend neurites, even in the absence of external cues. Compared to the later stages of neuronal development, such as neuronal polarization and dendrite morphogenesis, the early steps of neuritogenesis remain relatively unexplored. Here we showed that redistribution of cortical actin into large aggregates preceded neuritogenesis and determined the site of neurite initiation. Enhancing actin polymerization by jasplakinolide treatment effectively blocked actin redistribution and neurite initiation, while treatment with the actin depolymerizing agents latrunculin A or cytochalasin D accelerated neurite formation. Together, these results demonstrate a critical role of actin dynamics and reorganization in neurite initiation. Further experiments showed that microtubule dynamics and protein synthesis are not required for neurite initiation, but are required for later neurite stabilization. The redistribution of actin during early neuronal development was also observed in the cerebral cortex and hippocampus in vivo. Keywords Neurite initiation Neuritogenesis Actin aggregations Actin Microtubules