title: GABA-to-ACh ratio in basal forebrain and cerebral cortex varies significantly during sleep.
abstract: OBJECTIVE
  GABAergic and cholinergic transmission within the basal forebrain and cerebral cortex contribute to the regulation of sleep and wakefulness. In contrast to levels of acetylcholine (ACh), levels of endogenous GABA in basal forebrain and cortex during sleep and wakefulness have not previously been quantified. This study (1) tested the hypothesis that there are differential, state-specific changes in GABA levels within the substantia innominata (SI) region of the basal forebrain and somatosensory cortex; and (2) quantified the ratio of GABAergic to cholinergic transmission in the SI, cortex, and pontine reticular formation during rapid eye movement sleep (REM), non-REM sleep (NREM), and wakefulness.
  
  
  METHODS
  Within/between subjects.
  
  
  METHODS
  University of Michigan.
  
  
  METHODS
  Adult, male, purpose bred cats (n = 5).
  
  
  METHODS
  In vivo microdialysis, high performance liquid chromatography, electrophysiological recordings.
  
  
  RESULTS
  In the SI, GABA levels were significantly greater during NREM (17%) than during REM. In the cortex, GABA levels were significantly greater during NREM than during wakefulness (39%) and REM (63%). During prolonged wakefulness, there was a linear increase in cortical GABA levels, and the amount of time spent awake accounted for 87% of the variance in GABA. The GABA-to-ACh ratio was largest during NREM for all brain regions. REM was characterized by a 68% decrease in the GABA-to-ACh ratio across brain regions, always due to a decrease in GABA levels.
  
  
  CONCLUSIONS
  Three of the brain regions that comprise the anatomically distributed, sleep-generating network have in common a GABA-mediated, sleep-dependent decrease in the GABA-to-ACh ratio.
authors.affiliation: Department of Anesthesiology, University of Michigan, Ann Arbor, MI, USA.
authors.forename: Giancarlo
authors.initials: G
authors.lastname: Vanini
authors.forename: Ralph
authors.initials: R
authors.lastname: Lydic
authors.forename: Helen A
authors.initials: HA
authors.lastname: Baghdoyan
mesh_terms: D000109:Acetylcholine / Q000032:analysis* / Q000502:physiology; D000818:Animals; D002415:Cats; D002540:Cerebral Cortex / Q000737:chemistry* / Q000502:physiology; D004569:Electroencephalography; D008297:Male; D017551:Microdialysis; D016548:Prosencephalon / Q000737:chemistry* / Q000502:physiology; D012890:Sleep / Q000502:physiology*; D012895:Sleep, REM / Q000502:physiology; D013003:Somatosensory Cortex / Q000737:chemistry / Q000502:physiology; D013377:Substantia Innominata / Q000737:chemistry / Q000502:physiology; D014851:Wakefulness / Q000502:physiology; D005680:gamma-Aminobutyric Acid / Q000032:analysis* / Q000502:physiology
chemical_list: D005680:gamma-Aminobutyric Acid; D000109:Acetylcholine