Combination of adenosine A<inf>1</inf> and A<inf>2A</inf> receptor blocking agents induces caffeine-like locomotor stimulation in mice

Alexander Kuzmin, Björn Johansson, Lydia Gimenez, Sven Ove Ögren, Bertil B. Fredholm

Research output: Contribution to journalArticleResearchpeer-review

43 Citations (Scopus)

Abstract

The spontaneous locomotor activity of C57BL/6J mice was examined, using an automated detection system based on infra-red beams, after administration of caffeine (3-30 mg/kg, i.p.), the adenosine A2A receptor selective antagonist SCH 58261 (0.312-2.5 mg/kg, i.p.) and the A1 selective antagonist DPCPX (1.25-5 mg/kg, i.p.). SCH 58261 failed to influence motor activity in mice habituated to the test environment. DPCPX produced a small increase in motility and locomotion (significant at the dose of 5.0 mg/kg), much weaker than that produced by caffeine. Combined administration of DPCPX (1.2 mg/kg, i.p.) and SCH 58261 (1.2 mg/kg, i.p.) produced stimulation of motility and locomotion comparable with the effect of caffeine (15 mg/kg, i.p.). In contrast to motility and locomotion, rearing counts were not significantly influenced by DPCPX, SCH 58261, their combination, or by caffeine. Caffeine (15 mg/kg, i.p.) caused an increase in NGFI-A mRNA (an immediate early gene was chosen as an index of neuronal activation) in the piriform cortex 4 h after injection. This effect was reproduced by the combination of A1 and A2A receptor antagonist. It is hypothesised that the stimulatory effect of low doses of caffeine in C57BL/6J mice is due to concomitant blockade of both A1 and A2A adenosine receptors. © 2005 Elsevier B.V. and ECNP. All rights reserved.
Original languageEnglish
Pages (from-to)129-136
JournalEuropean Neuropsychopharmacology
Volume16
Issue number2
DOIs
Publication statusPublished - 1 Feb 2006

Keywords

  • Adenosine receptors
  • Caffeine
  • DPCPX
  • Locomotion
  • Mice
  • Motility
  • SCH 58261

Fingerprint Dive into the research topics of 'Combination of adenosine A<inf>1</inf> and A<inf>2A</inf> receptor blocking agents induces caffeine-like locomotor stimulation in mice'. Together they form a unique fingerprint.

Cite this