[Netrin-1 and axonal guidance: signaling and asymmetrical translation]

Med Sci (Paris). 2007 Mar;23(3):311-5. doi: 10.1051/medsci/2007233311.
[Article in French]

Abstract

More than 10 years after its initial discovery, netrin-1 - the first described chimioattractive molecule controlling the guidance of the commissural axons - has recently known a unsuspected wave of interest because of its implication in the development of the nervous system but also, more recently, fot its role in angiogenesis and tumorigenesis. Because, of a series of recent publications on netrin-1 signaling, we propose here to describe the recent insight in netrin-1 signaling via its main receptor DCC (deleted in colorectal cancer), and the recent discovery that netrin controls the assymetric distribution of beta-actin in the growth cone. Thus, it seems that netrin-1, but also the neurotrophic factor BDNF, controls acute growth cone responses such as collapse and turning by the regulation of localized protein translation, such as beta-actin. This process involves both transport of beta-actin mRNA, bound to Vg1RBP, to specific locations, and mRNA translation upon stimulation by local activation of the translation initiation regulator eIF-4E-binding protein 1. Indeed, Netrin-1 induces the movement of Vg1RBP granules into filopodia, and triggers a polarized increase in beta-actin translation on the near side of the growth cone before growth cone turning. The binding of BDNF to its receptor Trk has a similar effect for growth cone attraction, althought it is differentially regulated. Thus, this asymetrically synthesized beta-actin may direct actin polymerization and consequently the migration of the growth cone toward the cue.

Publication types

  • Review

MeSH terms

  • Actins / biosynthesis
  • Actins / genetics
  • Animals
  • Axons / physiology*
  • Axons / ultrastructure
  • Brain-Derived Neurotrophic Factor / physiology
  • Cell Polarity
  • Chemotaxis / physiology
  • Colonic Neoplasms / genetics
  • DCC Receptor
  • Genes, DCC
  • Growth Cones / physiology
  • Humans
  • Morphogenesis / physiology
  • Nerve Growth Factors / physiology*
  • Nerve Tissue Proteins / biosynthesis
  • Nerve Tissue Proteins / genetics
  • Netrin Receptors
  • Netrin-1
  • Protein Biosynthesis
  • Protein Kinases / physiology
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism
  • RNA-Binding Proteins / metabolism
  • Receptors, Cell Surface / physiology*
  • Signal Transduction / physiology*
  • Tumor Suppressor Proteins / physiology*

Substances

  • Actins
  • Brain-Derived Neurotrophic Factor
  • DCC Receptor
  • DCC protein, human
  • NTN1 protein, human
  • Nerve Growth Factors
  • Nerve Tissue Proteins
  • Netrin Receptors
  • RNA, Messenger
  • RNA-Binding Proteins
  • Receptors, Cell Surface
  • Tumor Suppressor Proteins
  • Netrin-1
  • Protein Kinases