Divergent effect of the selective D<inf>3</inf> receptor agonist pd-128,907 on locomotor activity in Roman high- and low-avoidance rats: Relationship to NGFI-A gene expression in the Calleja islands

Marc Guitart-Masip, Björn Johansson, Albert Fernández-Teruel, Adolf Tobeña, Lydia Giménez-Llort

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Abstract

Rationale: The inbred Roman high- (RHA-I) and low-avoidance (RLA-I) rats, differing in dopaminergic activity and novelty/substance-seeking profiles, may be a suitable model to study the implication of the dopaminergic system in vulnerability to drug abuse. Differences in D3 receptor binding recently described between the two strains (Guitart-Masip M, Johansson B, Fernández-Teruel A, Cañete T, Tobeña A, Terenius L, Giménez-Llort L, Neuroscience 142:1231-1243, 2006b) may be important in shaping the aforementioned differences in novelty seeking. Objective: The aim of the present work was to study the effect of D3 receptor activation on novelty-induced locomotor activity in these two strains of rats. Materials and methods: We administered saline and PD-128,907 (0.01 and 0.1 mg/kg), a putative D3 receptor agonist, to the Roman rats and studied the locomotor activity when animals were placed in a novel environment. Thereafter, by means of in situ hybridization, nerve growth factor inducible clone A (NGFI-A) mRNA was measured in the striatum and the Calleja islands of these animals. Results: We found that RLA-I rats showed stronger locomotor inhibition than RHA-I rats after PD-128,907 administration. Moreover, RLA-I rats showed stronger reduction of NGFI-A mRNA in the Calleja islands than RHA-I rats. Conclusions: These results, together with previous findings, suggest that differences in D3 receptor expression in the Calleja islands may contribute to the divergent behavioral effect of PD-128,907 administration in the two strains of Roman rats. © 2007 Springer-Verlag.
Original languageEnglish
Pages (from-to)39-49
JournalPsychopharmacology
Volume196
DOIs
Publication statusPublished - 1 Jan 2008

Keywords

  • Calleja islands
  • D receptors 3
  • Locomotion
  • NGFI-A
  • PD-128,907
  • Striatum

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