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Optogenetic Manipulation of Neural Circuits During Monitoring Sleep/wakefulness States in Mice
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Sleep. A physiologic role for IL-1 beta and TNF-alpha

James M Krueger1, Jidong Fang1, Ping Taishi1

  • 1Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology, Washington State University, Pullman, Washington 99164-6520, USA.

Annals of the New York Academy of Sciences
|January 26, 1999
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Interleukin-1 beta (IL-1 beta) and tumor necrosis factor-alpha (TNF-alpha) promote sleep. Their inhibition reduces sleep, and their natural rhythms align with peak sleep periods, highlighting their role in sleep regulation.

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Area of Science:

  • Neuroscience
  • Sleep Science
  • Immunology

Background:

  • Interleukin-1 beta (IL-1 beta) and tumor necrosis factor-alpha (TNF-alpha) are key cytokines implicated in physiological sleep regulation.
  • These molecules exhibit diurnal rhythms in the brain, peaking during periods of highest sleep.
  • Previous research indicates their involvement in the complex cascade of sleep-inducing substances.

Purpose of the Study:

  • To elucidate the role of IL-1 beta and TNF-alpha in the regulation of physiological sleep.
  • To investigate the impact of exogenous administration and inhibition of these cytokines on sleep patterns.
  • To understand the molecular mechanisms underlying sleep regulation involving these inflammatory mediators.

Main Methods:

  • Administration of exogenous IL-1 beta and TNF-alpha to assess effects on non-rapid eye movement sleep (NREMS).
  • Inhibition of IL-1 and TNF pathways to evaluate changes in spontaneous sleep.
  • Analysis of diurnal rhythms of IL-1 beta and TNF-alpha mRNA in brain tissue.
  • Phenotyping of mice lacking TNF 55-kD or IL-1 type I receptors to assess sleep behavior.

Main Results:

  • Exogenous administration of IL-1 beta or TNF-alpha significantly increased NREMS.
  • Inhibition of IL-1 or TNF signaling led to a reduction in spontaneous sleep.
  • Mice deficient in TNF 55-kD or IL-1 type I receptors exhibited reduced sleep duration compared to controls.
  • Diurnal expression patterns of IL-1 beta and TNF-alpha mRNA correlated with natural sleep-wake cycles.

Conclusions:

  • IL-1 beta and TNF-alpha are crucial endogenous regulators of sleep.
  • These cytokines are integral components of a broader biochemical cascade that influences sleep.
  • Further research is needed to define the precise molecular steps and anatomical locations through which these substances regulate sleep.