Lack of effects of GHB precursors GBL and 1,4-BD following i.c.v. administration in rats

Lawrence P. Carter, Wouter Koek, Charles P. France

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Gamma-hydroxybutyrate (GHB) is used therapeutically and recreationally worldwide. Since the scheduling of GHB by the USA and the United Nations in 2000-2001, the recreational use of GHB precursors has reportedly increased. The aim of this study was to examine if potency differences of GHB and GHB-like compounds are due to their blood-brain barrier permeability. The effects of peripheral and central administration of GHB, GHB precursors gamma-butyrolactone (GBL) and 1,4-butanediol (1,4-BD), and the gamma-aminobutyric acid (GABA) B receptor agonist baclofen on schedule-controlled responding were examined in rats. GHB and baclofen were 276- and 253-fold more potent, respectively, after intracerebroventricular (i.c.v.) administration than after intraperitoneal (i.p.) administration, whereas GBL and 1,4-BD, up to a dose of 1780 μg were without effect after i.c.v. administration. These data suggest that GBL and 1,4-BD are not metabolically converted to GHB in the brain, that enhanced brain penetration cannot account for potency differences between compounds, and that baclofen, like GHB, can readily cross the blood-brain barrier.

Original languageEnglish (US)
Pages (from-to)2595-2600
Number of pages6
JournalEuropean Journal of Neuroscience
Volume24
Issue number9
DOIs
StatePublished - Nov 2006

Keywords

  • Baclofen
  • Central
  • Operant
  • Peripheral
  • Potency

ASJC Scopus subject areas

  • Neuroscience(all)

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