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Related Experiment Videos

Changing interactions between astrocytes and neurons during CNS maturation.

E E Geisert1, A M Stewart

  • 1Department of Cell Biology, University of Alabama, Birmingham 35294.

Developmental Biology
|February 11, 1991
PubMed
Summary

Neonatal astrocytes promote twice the neurite growth compared to injured adult astrocytes. This difference in axonal growth is due to surface molecules, not soluble factors or proteases.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cell Biology

Background:

  • The developing brain and injured adult brain exhibit distinct capacities for axonal regeneration.
  • Astrocytes, a type of glial cell, are implicated in modulating neuronal growth.
  • Understanding astrocyte-neuron interactions is crucial for neural repair strategies.

Purpose of the Study:

  • To investigate the role of astrocytes in differential axonal growth between developing and injured adult brains.
  • To compare the ability of neonatal and injured adult astrocytes to support neurite outgrowth in vitro.
  • To elucidate the mechanisms underlying the observed differences in neuronal growth patterns.

Main Methods:

  • Neurons were cultured on astrocytes derived from neonatal rat cortex and injured adult brain.

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  • Neurite length and growth patterns were analyzed in co-culture systems.
  • Experiments were conducted in both adherent and suspended neuron-astrocyte cultures, with and without fetal calf serum.

    • Main Results:

    • Neurons grown on neonatal astrocytes exhibited neurites twice as long as those on injured adult astrocytes.
    • Neurites preferentially followed neonatal astrocytic processes, while crossing adult astrocytic processes orthogonally.
    • No significant differences in neurite growth were observed in suspended cultures or with protease inhibitors, indicating cell-surface interactions are key.

    Conclusions:

    • The surface molecular composition of injured adult astrocytes is less supportive of neurite growth compared to neonatal astrocytes.
    • Differences in astrocyte function and surface properties may change during central nervous system development and injury.
    • These findings highlight astrocyte-derived cues as critical determinants of axonal regeneration potential.