Anosmin-1 over-expression regulates oligodendrocyte precursor cell proliferation, migration and myelin sheath thickness

Brain Struct Funct. 2016 Apr;221(3):1365-85. doi: 10.1007/s00429-014-0977-4. Epub 2015 Feb 8.


During development of the central nervous system, anosmin-1 (A1) works as a chemotropic cue contributing to axonal outgrowth and collateralization, as well as modulating the migration of different cell types, fibroblast growth factor receptor 1 (FGFR1) being the main receptor involved in all these events. To further understand the role of A1 during development, we have analysed the over-expression of human A1 in a transgenic mouse line. Compared with control mice during development and in early adulthood, A1 over-expressing transgenic mice showed an enhanced oligodendrocyte precursor cell (OPC) proliferation and a higher number of OPCs in the subventricular zone and in the corpus callosum (CC). The migratory capacity of OPCs from the transgenic mice is increased in vitro due to a higher basal activation of ERK1/2 mediated through FGFR1 and they also produced more myelin basic protein (MBP). In vivo, the over-expression of A1 resulted in an elevated number of mature oligodendrocytes with higher levels of MBP mRNA and protein, as well as increased levels of activation of the ERK1/2 proteins, while electron microscopy revealed thicker myelin sheaths around the axons of the CC in adulthood. Also in the mature CC, the nodes of Ranvier were significantly longer and the conduction velocity of the nerve impulse in vivo was significantly increased in the CC of A1 over-expressing transgenic mice. Altogether, these data confirmed the involvement of A1 in oligodendrogliogenesis and its relevance for myelination.

Keywords: Conduction velocity; Development; ERK1/2; Myelination; Oligodendrocyte; Proliferation; Subventricular zone.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Brain / embryology*
  • Brain / metabolism
  • Brain / physiology*
  • Cell Movement*
  • Cell Proliferation*
  • Cells, Cultured
  • Corpus Callosum / embryology
  • Corpus Callosum / metabolism
  • Corpus Callosum / physiology
  • Corpus Callosum / ultrastructure
  • Extracellular Matrix Proteins / metabolism
  • Extracellular Matrix Proteins / physiology*
  • Humans
  • MAP Kinase Signaling System
  • Mice
  • Mice, Inbred C57BL
  • Mice, Transgenic
  • Myelin Sheath / physiology*
  • Nerve Tissue Proteins / metabolism
  • Nerve Tissue Proteins / physiology*
  • Oligodendroglia / metabolism
  • Oligodendroglia / physiology*
  • Receptor, Fibroblast Growth Factor, Type 1 / metabolism


  • ANOS1 protein, human
  • Extracellular Matrix Proteins
  • Nerve Tissue Proteins
  • Fgfr1 protein, mouse
  • Receptor, Fibroblast Growth Factor, Type 1