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Microglia support neural stem cell maintenance and growth.

Takeshi K Matsui1, Eiichiro Mori2

  • 1Department of Future Basic Medicine, Nara Medical University, Japan; Department of Neurology, Nara Medical University, Japan.

Biochemical and Biophysical Research Communications
|August 13, 2018
PubMed
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Microglia, immune cells in the brain, support neural stem cell (NSC) proliferation by secreting beneficial factors. This finding highlights microglia

Keywords:
Brain developmentCentral nervous systemMicrogliaNeural stem/progenitor cell

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Area of Science:

  • Neuroscience
  • Stem Cell Biology
  • Immunology

Background:

  • Microglia, the brain's resident immune cells, are increasingly recognized for their protective roles in neurodegenerative diseases.
  • Microglia exhibit polarization into M1 (inflammatory) and M2 (anti-inflammatory) states, influencing brain development and function.
  • Neural stem/progenitor cells (NSPCs) are crucial for brain development, neurogenesis, and neuronal growth.

Purpose of the Study:

  • To investigate the impact of microglial secretions on the proliferation and differentiation of neural stem/progenitor cells (NSPCs).
  • To determine if microglia-conditioned media can support NSPC maintenance and growth.

Main Methods:

  • Cultured adult mouse-derived NSPCs in conditioned media from BV2 immortalized microglia.
  • Assessed NSPC differentiation and proliferation with and without microglial soluble factors, alongside growth factors like bFGF and EGF.
  • Utilized conditioned media from M2-polarized primary microglia (stimulated by IL-10/IL-13) to evaluate effects on NSPC proliferation.

Main Results:

  • NSPCs cultured with BV2-derived soluble factors and growth factors maintained Nestin expression and exhibited increased proliferation.
  • Conditioned media from M2-polarized microglia significantly supported NSPC proliferation.
  • Microglia secrete neuro-nutritious soluble factors that promote neural stem cell proliferation.

Conclusions:

  • Microglia play a supportive role in maintaining neural stem cell populations.
  • Microglial secretions, particularly from M2-polarized cells, enhance NSPC proliferation.
  • These findings suggest therapeutic potential for microglia-derived factors in regenerative neuroscience.