Novel role of brain stem pedunculopontine tegmental adenylyl cyclase in the regulation of spontaneous REM sleep in the freely moving rat

Subimal Datta, Sarah L. Prutzman

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Physiological activation of kainate receptors and GABAB receptors within the pedunculopontine tegmentum (PPT) is involved in regulation of rapid-eye-movement (REM) sleep. Because these two types of receptors may also directly and/or indirectly activate the intracellular cyclic adenosine monophosphate (cAMP) signaling pathway, we hypothesized that this signaling pathway may be involved in the PPT to regulate spontaneous REM sleep. To test this hypothesis, four different doses (0.25, 0.50, 0.75, and 1.0 nmol) of a specific adenylyl cyclase (AC) inhibitor, 9-(tetrahydro-2-furanyl)-9H-purin-6- amine (SQ22536), were microinjected bilaterally (100 nl/site) into the PPT, and the effects on REM sleep in freely moving chronically instrumented rats were quantified. By comparing alterations in the patterns of REM sleep after control injections of vehicle or one of the four different doses of SQ22536, the contributions made by each dose of SQ22536 to REM sleep were evaluated. The results demonstrated that the local microinjection of AC inhibitor SQ22536 into the PPT decreased the total amount of REM sleep for 3 h and increased slow-wave sleep (SWS) for 2 h in a dose-dependent manner. This reduction in REM sleep was due to increased latency and decreased frequency of REM sleep episodes. These results provide evidence that inhibition of AC within the PPT can successfully reduce REM sleep. These findings suggest that activation of the cAMP-signaling pathway within the cholinergic cell compartment of the PPT is an intracellular biochemical/molecular step for generating REM sleep in the freely moving rat.

Original languageEnglish (US)
Pages (from-to)1928-1937
Number of pages10
JournalJournal of Neurophysiology
Volume94
Issue number3
DOIs
StatePublished - Sep 1 2005
Externally publishedYes

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REM Sleep
Adenylyl Cyclases
Brain Stem
Sleep
Cyclic AMP
Kainic Acid Receptors
Microinjections
Cholinergic Agents
Injections

All Science Journal Classification (ASJC) codes

  • Physiology
  • Neuroscience(all)

Cite this

Novel role of brain stem pedunculopontine tegmental adenylyl cyclase in the regulation of spontaneous REM sleep in the freely moving rat. / Datta, Subimal; Prutzman, Sarah L.

In: Journal of Neurophysiology, Vol. 94, No. 3, 01.09.2005, p. 1928-1937.

Research output: Contribution to journalArticle

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