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MicroRNA 132 alters sleep and varies with time in brain

Christopher J Davis1, James M Clinton, Ping Taishi

  • 1Washington State University-Spokane, Health Sciences Bldg. 280E, 412 E Spokane Falls Blvd., Spokane, WA 99202, USA. cjdavis@wsu.edu

Journal of Applied Physiology (Bethesda, Md. : 1985)
|July 2, 2011
PubMed

Insights

MicroRNA-132 (miRNA-132) directly impacts sleep architecture. Enhancing miRNA-132 levels reduced non-rapid-eye-movement sleep (NREMS) and slow-wave activity (SWA), suggesting a regulatory role in sleep.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Sleep Science

Background:

  • Brain microRNA (miRNA) levels are affected by sleep deprivation.
  • The specific role of individual miRNAs in regulating sleep remains largely undescribed.

Purpose of the Study:

  • To investigate the direct effect of microRNA-132 (miRNA-132) on sleep regulation.
  • To explore the impact of miRNA-132 manipulation on sleep architecture and intensity.

Main Methods:

  • Intracerebroventricular and unilateral supracortical administration of a miRNA-132 mimetic (preMIR-132) in rats.
  • Electrophysiological recordings (EEG) to measure sleep parameters, including non-rapid-eye-movement sleep (NREMS), rapid eye movement sleep (REMS), and slow-wave activity (SWA).
  • Measurement of cortical miRNA-132 levels following mimetic injection.

Main Results:

  • Intracerebroventricular preMIR-132 decreased NREMS duration and increased REMS duration during the light phase.
  • PreMIR-132 administration reduced EEG slow-wave activity (SWA) during NREMS, indicating decreased sleep intensity.
  • Effects were state-specific to NREMS and localized to the injection site after supracortical application.
  • Cortical miRNA-132 levels increased post-injection, correlating with observed EEG effects.
  • Spontaneous cortical miRNA-132 levels were lower at the end of the light period compared to the dark period.

Conclusions:

  • MicroRNAs, specifically miRNA-132, play a direct regulatory role in modulating sleep.
  • miRNA-132 influences both sleep duration and intensity (SWA).
  • These findings offer a novel tool for studying sleep regulation mechanisms.

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