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Assessment of Dendritic Arborization in the Dentate Gyrus of the Hippocampal Region in Mice
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Corticosterone reduces dendritic complexity in developing hippocampal CA1 neurons.

Deborah N Alfarez1, Anna De Simoni, Els H Velzing

  • 1Swammerdam Institute for Life Sciences, Center for Neuroscience, Universiteit van Amsterdam, Amsterdam, The Netherlands.

Hippocampus
|February 24, 2009
PubMed
Summary

Elevated corticosterone levels rapidly reduce dendritic complexity in developing hippocampal CA1 neurons. This effect, mediated by glucocorticoid receptors, highlights the importance of low corticosterone during brain development.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Endocrinology

Background:

  • Prolonged stress and corticosteroids alter hippocampal CA3 morphology.
  • The adult hippocampal CA1 area shows resistance to stress-induced changes.

Purpose of the Study:

  • To investigate the impact of elevated corticosteroid levels on dendritic complexity in developing hippocampal CA1 neurons.
  • To determine the time course and dose-dependency of corticosterone effects on CA1 neuronal morphology.

Main Methods:

  • Organotypic hippocampal slice cultures from P5 rats were used.
  • Neurons were filled with Alexa dye for imaging and dendritic morphology analysis.
  • Fractal analysis quantified neuronal complexity after corticosterone exposure.

Main Results:

  • 100 nM corticosterone induced apical dendritic tree atrophy within 1-4 hours.
  • 30 nM corticosterone caused delayed apical atrophy ( >2 hours post-exposure).
  • Neither dose affected basal dendrite length or spine density; effects were blocked by a glucocorticoid receptor antagonist.

Conclusions:

  • High physiological corticosterone levels rapidly reduce CA1 neuron dendritic complexity in young hippocampal tissue via glucocorticoid receptors.
  • These findings underscore the critical need to maintain low plasma corticosterone during hippocampal development.