Vesicular glutamate transporters play a role in neuronal differentiation of cultured SVZ-derived neural precursor cells

PLoS One. 2017 May 11;12(5):e0177069. doi: 10.1371/journal.pone.0177069. eCollection 2017.

Abstract

The role of glutamate in the regulation of neurogenesis is well-established, but the role of vesicular glutamate transporters (VGLUTs) and excitatory amino acid transporters (EAATs) in controlling adult neurogenesis is unknown. Here we investigated the implication of VGLUTs in the differentiation of subventricular zone (SVZ)-derived neural precursor cells (NPCs). Our results show that NPCs express VGLUT1-3 and EAAT1-3 both at the mRNA and protein level. Their expression increases during differentiation closely associated with the expression of marker genes. In expression analyses we show that VGLUT1 and VGLUT2 are preferentially expressed by cultured SVZ-derived doublecortin+ neuroblasts, while VGLUT3 is found on GFAP+ glial cells. In cultured NPCs, inhibition of VGLUT by Evans Blue increased the mRNA level of neuronal markers doublecortin, B3T and MAP2, elevated the number of NPCs expressing doublecortin protein and promoted the number of cells with morphological appearance of branched neurons, suggesting that VGLUT function prevents neuronal differentiation of NPCs. This survival- and differentiation-promoting effect of Evans blue was corroborated by increased AKT phosphorylation and reduced MAPK phosphorylation. Thus, under physiological conditions, VGLUT1-3 inhibition, and thus decreased glutamate exocytosis, may promote neuronal differentiation of NPCs.

MeSH terms

  • Animals
  • Cells, Cultured
  • Doublecortin Protein
  • Gene Expression Regulation, Developmental
  • Glutamate Plasma Membrane Transport Proteins / genetics
  • Glutamate Plasma Membrane Transport Proteins / metabolism
  • Lateral Ventricles / cytology*
  • Lateral Ventricles / metabolism
  • Neural Stem Cells / cytology*
  • Neural Stem Cells / metabolism
  • Neurogenesis*
  • Neurons / cytology*
  • Neurons / metabolism
  • Rats
  • Vesicular Glutamate Transport Proteins / genetics
  • Vesicular Glutamate Transport Proteins / metabolism*

Substances

  • Dcx protein, rat
  • Doublecortin Protein
  • Glutamate Plasma Membrane Transport Proteins
  • Vesicular Glutamate Transport Proteins

Grants and funding

This study was supported by the grants SAF2010-20337 and BFU-2013-43163-R from Ministry of Economy and Competitiveness (MINECO, Spain), GR35/10-B and GR3/14 (Complutense University of Madrid-Santander Bank) and RD06/0026/0012 (Institute of Health Carlos III, ISCIII). E. Sánchez-Mendoza has a contract from RD06/0026/0012. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.