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Area of Science:

  • Neuroscience
  • Sleep Science
  • Cell Biology

Background:

  • The function of sleep remains largely unknown.
  • The synaptic homeostasis hypothesis suggests sleep renormalizes synaptic changes during wakefulness.
  • Previous studies provided limited evidence on sleep's role in synaptic downregulation at the whole-neuron level.

Purpose of the Study:

  • To investigate sleep-dependent synaptic changes at the single-neuron level in zebrafish larvae.
  • To determine if sleep actively promotes synaptic downregulation.
  • To explore the regulation of synaptic homeostasis by sleep pressure.

Main Methods:

  • Repeatedly imaging all excitatory synapses on single neurons in zebrafish larvae across sleep-wake states.
  • Manipulating sleep pressure through prolonged wakefulness and pharmacological interventions.
  • Measuring synapse gain during wake and loss during sleep.

Main Results:

  • Synapses are gained during wakefulness and lost during sleep in a neuron-subtype-dependent manner.
  • Synapse loss is greatest during sleep following high sleep pressure.
  • Pharmacologically induced sleep without high sleep pressure showed minimal synapse loss unless adenosine and noradrenergic tone were modulated.

Conclusions:

  • Sleep-dependent synapse loss is regulated by sleep pressure at the single-neuron level.
  • The capacity of sleep to facilitate synaptic homeostasis varies depending on sleep pressure and duration.
  • These findings provide insights into the active role of sleep in synaptic renormalization.