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Decreased REM sleep and altered circadian sleep regulation in mice lacking vasoactive intestinal polypeptide

Wang-Ping Hu1, Jia-Da Li, Christopher S Colwell

  • 1Department of Pharmacology, University of California, Irvine, CA 92697, USA.

Sleep
|January 5, 2011
PubMed
Abstract

Insights

Vasoactive intestinal polypeptide (VIP) deficiency in mice reduces rapid eye movement (REM) sleep duration and impairs sleep rebound. VIP also plays a role in regulating sleep patterns and circadian rhythms.

Area of Science:

  • Neuroscience
  • Sleep Science
  • Chronobiology

Background:

  • Vasoactive intestinal polypeptide (VIP) is known to influence sleep, particularly rapid eye movement (REM) sleep.
  • Previous studies suggest VIP is crucial for circadian rhythmicity in physiological and behavioral processes.

Purpose of the Study:

  • To investigate the role of VIP in sleep regulation.
  • To examine sleep-wake patterns in VIP-deficient (VIP-/-) mice.

Main Methods:

  • EEG/EMG sleep-wake patterns were recorded in VIP-/- mice and wild-type controls.
  • Recordings were conducted under light-dark, constant darkness, and sleep deprivation conditions.

Main Results:

  • VIP-/- mice showed significantly reduced REM sleep time over 24 hours.
  • The reduction in REM sleep was due to shorter REM sleep bout durations, not frequency.
  • Compensatory sleep rebounds (NREM and REM) were attenuated in VIP-/- mice.
  • VIP deficiency altered the temporal distribution of sleep, reducing rhythm amplitude.

Conclusions:

  • VIP regulates the duration of REM sleep.
  • VIP is involved in sleep homeostatic mechanisms.
  • VIP influences the temporal patterning of sleep and circadian rhythms.
Keywords:
EEGSleepcircadianknock-outvasoactive intestinal polypeptide

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