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Related Experiment Videos

Uncoupling proteins and sleep deprivation.

C Cirelli1, G Tononi

  • 1Department of Psychiatry, University of Wisconsin-Madison, 6001 Research Park Blvd, Madison WI 53719, USA. ccirelli@wisc.edu

Archives Italiennes De Biologie
|October 21, 2004
PubMed
Summary

Sleep deprivation increases energy expenditure through mitochondrial uncoupling proteins. Long-term sleep loss significantly elevates UCP2 in liver and muscle, potentially impacting overall resting energy expenditure and survival.

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Area of Science:

  • Physiology
  • Metabolism
  • Sleep Science

Background:

  • Sleep deprivation (SD) increases food intake and energy expenditure (EE) in humans and animals.
  • The underlying mechanisms for increased EE during SD remain unclear.
  • Mitochondrial proton leak, mediated by uncoupling proteins (UCPs), significantly contributes to resting EE.

Purpose of the Study:

  • To investigate the role of UCP2, UCP3, and UCP5 mRNA levels in energy expenditure during sleep and sleep deprivation.
  • To determine the impact of short-term and long-term SD on UCP expression in various tissues.

Main Methods:

  • Quantified UCP2, UCP3, and UCP5 mRNA levels in rats.
  • Compared expression during spontaneous sleep/waking cycles and after 8 hours or 7 days of SD.
  • Analyzed UCP expression in brain and peripheral tissues, including skeletal muscle and liver.

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Main Results:

  • No significant changes in UCP expression were observed during normal sleep/waking cycles.
  • UCP3 expression in skeletal muscle increased similarly after both short-term and long-term SD.
  • UCP2 expression significantly increased in the liver and skeletal muscle after long-term SD, but not after short-term SD.

Conclusions:

  • Elevated UCP2 expression in skeletal muscle following long-term SD may contribute to increased resting EE.
  • UCPs, particularly UCP2, are implicated in the metabolic adaptations to sleep deprivation.
  • Understanding these mechanisms is crucial for addressing the physiological consequences of SD.