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Multiple sleep alterations in mice lacking cannabinoid type 1 receptors.

Alessandro Silvani1, Chiara Berteotti1, Stefano Bastianini1

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Mice lacking cannabinoid type 1 (CB1) receptors show altered sleep patterns, with increased wakefulness and impaired sleep regulation. Diet did not significantly impact these sleep changes in CB1 receptor knockout mice.

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Area of Science:

  • Neuroscience
  • Sleep Research
  • Cannabinoid System

Background:

  • Cannabinoid type 1 (CB1) receptors are crucial for brain function and behavior control.
  • Endocannabinoid signaling is influenced by diet, particularly high-fat diets (HFD).
  • Understanding CB1 receptor roles in sleep is essential for neurological and metabolic health.

Purpose of the Study:

  • To investigate the impact of congenital CB1 receptor deficiency on sleep architecture.
  • To determine if high-fat diet (HFD) modifies sleep alterations in CB1 receptor knockout (KO) mice.
  • To assess the role of CB1 receptors in sleep homeostasis and arousal responses.

Main Methods:

  • CB1 receptor knockout (KO) and wild-type (WT) mice were fed standard diet (SD) or HFD for 4 months.
  • Sleep patterns were recorded using electroencephalography (EEG) and electromyography (EMG).
  • Experiments included baseline recordings, sleep deprivation, sleep recovery, and an insomnia model (cage switch).

Main Results:

  • CB1 receptor KO mice exhibited increased wakefulness and reduced non-rapid-eye-movement (NREMS) and rapid-eye-movement sleep (REMS) during the active period.
  • KO mice displayed altered EEG theta rhythm during REMS and diminished REMS rebound after sleep deprivation.
  • CB1 receptor deficiency led to faster habituation to the cage-switch induced arousal, indicating reduced sensitivity to novelty.
  • No significant effects of HFD or diet-genotype interaction on sleep were observed.

Conclusions:

  • Congenital absence of CB1 receptors significantly disrupts sleep regulation, increasing arousal during the active phase.
  • CB1 receptors play a critical role in maintaining normal sleep architecture, REMS homeostasis, and response to arousing stimuli.
  • Dietary interventions, including HFD, did not alter the observed sleep phenotypes in CB1 receptor deficient mice.