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The effects of voluntary running exercise coincidence with social isolation after early weaning on monoaminergic

J Ishikawa1, A Ishikawa

  • 1Systems Neuroscience, Department of Neuroscience, Yamaguchi University Graduate School of Medicine, 1-1-1 Minamikogushi, Ube, Yamaguchi 755-8505, Japan. junko-lc@yamaguchi-u.ac.jp

Neuroscience
|November 27, 2012
PubMed

Insights

Early weaning and social isolation impair monoaminergic neuron development. Voluntary running exercise in juvenile rats prevented these negative effects, suggesting exercise benefits brain development and emotional function.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Behavioral Science

Background:

  • Rearing conditions impact juvenile monoaminergic neuron development, affecting emotional and cognitive functions.
  • Impaired development of serotonin (5-HT), noradrenaline (NA), and tyrosine hydroxylase (TH) containing neurons is linked to dysfunction.
  • Exercise shows potential benefits for emotional and learning performance in adults.

Purpose of the Study:

  • To investigate if voluntary running exercise can prevent impaired monoaminergic axonal development caused by early weaning and social isolation (EI).
  • To assess the effects of EI and subsequent exercise on monoaminergic axon density in specific brain regions.

Main Methods:

  • Rats were subjected to early weaning/social isolation (EI) from postnatal day 14-28.
  • One group (EI+R) engaged in voluntary running exercise during the EI period.
  • Monoaminergic axon density was quantified in the medial prefrontal cortex (mPFC), amygdala, and hippocampus using immunohistochemistry.

Main Results:

  • EI rats exhibited reduced 5-HT and NA axon density in the dorsal-mPFC and amygdala, and reduced NA and TH axons in the ventral-mPFC compared to controls.
  • Voluntary running (EI+R) prevented these EI-induced deficits in the dorsal-mPFC and amygdala.
  • While EI+R rats showed higher 5-HT axon density in the ventral-mPFC than EI rats, it remained lower than controls. Hippocampal axon density was unaffected.

Conclusions:

  • Voluntary running exercise during juvenile social isolation can counteract adverse effects on monoaminergic axonal development in key brain areas.
  • Exercise may modulate monoaminergic axonal morphology, offering protective benefits for brain development.
  • Findings support further research into juvenile exercise's role in enhancing brain development and cognitive/emotional performance.

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