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Related Experiment Videos

Single or multiple oligodendroglial lineages: a controversy.

N Spassky1, C Olivier, E Perez-Villegas

  • 1Biologie des Interactions Neurones/Glie, INSERM U-495, Université Pierre et Marie Curie, Hôpital de la Salpêtrière, France.

Glia
|January 14, 2000
PubMed
Summary

Oligodendrocyte precursor cells arise much earlier during embryonic development than previously believed, nearly simultaneously with neurons. Further research suggests at least two distinct oligodendrocyte precursor cell types exist.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cell Biology

Background:

  • Oligodendrocytes are traditionally considered the last cells to emerge during embryonic development.
  • Existing literature suggests a late developmental origin for these crucial glial cells.

Purpose of the Study:

  • To investigate the precise spatio-temporal origin of oligodendrocytes during embryonic development.
  • To identify and characterize distinct oligodendrocyte precursor cell populations.

Main Methods:

  • Analysis of plp/dm-20 gene expression patterns during chick and mouse embryonic development.
  • Review of experimental evidence for oligodendrocyte precursor cell markers and their dependencies.

Main Results:

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  • Evidence suggests oligodendrocyte induction occurs significantly earlier than previously thought, potentially alongside neuronal development.
  • Identification of at least two distinct oligodendrocyte precursor cell populations based on marker expression (PDGFRalpha and plp/dm-20).
  • The plp/dm-20 expressing precursor cells appear independent of PDGF-AA for proliferation and survival.

    • Conclusions:

    • Oligodendrocyte development begins much earlier in embryogenesis, with maturation occurring later.
    • The existence of multiple, distinct oligodendrocyte precursor cell types is supported, with a potential third type yet to be identified.