Abstract
Mechanisms determining neuronal polarity have been most extensively studied using dissociated hippocampal neurons which develop in a very stereotypic manner in the absence of differential extrinsic cues. Polarity is established in two major steps: first, an initial deformation of the spherical cell gives rise to the first neurite, and later, after multiple neurites grew from the sphere, one neurite will be selected for fast axonal outgrowth. Both steps are under the tight control of cytoskeletal rearrangements; sub-membranous local actin remodelling will support the disruption of the spherical architecture to thus allow the formation of the first neurite and from this, later on, rapid growth. Axonal growth from a multipolar neuron at later stages has been shown to be supported by local actin destabilization and that could be achieved either by intrinsic or extrinsic cues, demonstrating that polarity establishment is a complex endogenously controlled remodelling process, under active control by extrinsic factors.
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Gärtner, A., Dotti, C.G. (2011). Actin and Neuronal Polarity. In: Gallo, G., Lanier, L. (eds) Neurobiology of Actin. Advances in Neurobiology, vol 5. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-7368-9_9
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DOI: https://doi.org/10.1007/978-1-4419-7368-9_9
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