The atRA-responsive gene neuron navigator 2 functions in neurite outgrowth and axonal elongation.

Developmental Neurobiology
Parag D MuleyM Clagett-Dame

Abstract

Neuron navigator 2 (Nav2) was first identified as an all-trans retinoic acid (atRA)-responsive gene in human neuroblastoma cells (retinoic acid-induced in neuroblastoma 1, RAINB1) that extend neurites after exposure to atRA. It is structurally related to the Caenorhabditis elegans unc-53 gene that is required for cell migration and axonal outgrowth. To gain insight into NAV2 function, the full-length human protein was expressed in C. elegans unc-53 mutants under the control of a mechanosensory neuron promoter. Transgene expression of NAV2 rescued the defects in unc-53 mutant mechanosensory neuron elongation, indicating that Nav2 is an ortholog of unc-53. Using a loss-of-function approach, we also show that Nav2 induction is essential for atRA to induce neurite outgrowth in SH-SY5Y cells. The NAV2 protein is located both in the cell body and along the length of the growing neurites of SH-SY5Y cells in a pattern that closely mimics that of neurofilament and microtubule proteins. Transfection of Nav2 deletion constructs in Cos-1 cells reveals a region of the protein (aa 837-1065) that directs localization with the microtubule cytoskeleton. Collectively, this work supports a role for NAV2 in neurite outgrowth and axonal elongation ...Continue Reading

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Citations

Feb 27, 2010·Neural Development·Elizabeth M McNeillMargaret Clagett-Dame
Apr 19, 2013·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Yi ZhangZheng Gang Zhang
Jan 19, 2012·Nutrients·Margaret Clagett-Dame, Danielle Knutson
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