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Related Experiment Videos

Exploratory behavior, cortical BDNF expression, and sleep homeostasis.

Reto Huber1, Giulio Tononi, Chiara Cirelli

  • 1Department of Psychiatry, University of Wisconsin-Madison, Madison, WI 53719, USA.

Sleep
|March 1, 2007
PubMed
Summary
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Exploratory activity during wakefulness influences sleep need by triggering synaptic plasticity. Brain-derived neurotrophic factor (BDNF) mediates this link, impacting slow-wave activity (SWA) during sleep.

Area of Science:

  • Neuroscience
  • Sleep Science
  • Molecular Biology

Background:

  • Slow-wave activity (SWA) during non-rapid eye movement (NREM) sleep reflects sleep need, increasing with wakefulness duration.
  • The specific biological processes during wakefulness that drive this SWA increase remain unidentified.

Purpose of the Study:

  • To investigate whether neuronal plasticity underlies the relationship between waking activities and the subsequent SWA response.
  • To determine if specific waking behaviors correlate with molecular markers of plasticity and sleep regulation.

Main Methods:

  • Exploratory activity in rats was manipulated while total wakefulness duration was kept constant.
  • Cortical expression of plasticity-related genes (BDNF, Arc, Homer, NGFI-A) and SWA were measured during subsequent sleep periods.

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Main Results:

  • The amount of exploratory behavior during wakefulness directly predicted the induction of BDNF.
  • Exploration levels also correlated with the magnitude of the homeostatic SWA response during sleep.

Conclusions:

  • A direct link exists between synaptic plasticity induced by waking activities and the homeostatic sleep response.
  • Brain-derived neurotrophic factor (BDNF) is identified as a key molecular mediator in this connection.