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Guidance Mechanisms in Neuronal and Axonal Migration Daisuke H. Tanaka 1 , Kenta Yamauchi 2 , Fujio Murakami 2 1Department of Anatomy, Keio University School of Medicine 2Laboratory of Neuroscience, Graduate School of Frontier Biosciences, Osaka University Keyword: brain , development , neuronal migration , axon guidance , guidance molecule pp.405-413
Published Date 2008/4/1
DOI https://doi.org/10.11477/mf.1416100262
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Abstract

 During development, neurons migrate from their birthplace to their appropriate positions and extend their axons toward their proper targets. These events are crucial for the establishment of CNS cytoarchitectures and neural cuircuits essential for brain functions. Recent genetic and biochemical studies have led to the notion that neurons and axons appear to be guided by similar guidance mechanisms and molecules. They appear to be guided by at least four distinct mechanisms: contact attraction, chemoattraction, contact repulsion, and chemorepulsion. These mechanisms are mediated by evolutionarily conserved ligand-receptor system. Extracellualr guidance cues, including Netrins, Slits, Semaphorins and Ephrins, act as ligands, while membrane proteins which are expressed in migrating neurons or axons serve as receptors. A certain guidance cue can bind to several distinct receptors and vice versa, leading to elicit diverse responses in migrating neurons or axons with a relatively small number of guidance cues.


Copyright © 2008, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1344-8129 印刷版ISSN 1881-6096 医学書院

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