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IPM
30
YEARS OLD

“School of Cognitive Sciences”

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Paper   IPM / Cognitive Sciences / 13201
School of Cognitive Sciences
  Title:   Involvement of the nucleus accumbens shell dopaminergic system in prelimbic NMDA-induced anxiolytic-like behaviors
  Author(s): 
1.  H. Ahmadi
2.  M. Nasehi
3.  P. Rostami
4.  M.R. Zarrindast
  Status:   Published
  Journal: Neuropharmacology
  Vol.:  71
  Year:  2013
  Pages:   112-123
  Supported by:  IPM
  Abstract:
Background Nucleus accumbens (NAc) and prefrontal cortex (PFC) dopaminergic and glutamatergic systems are involved in fear/anxiety-related behaviors; meanwhile NAc dopaminergic system activity is mediated by PFC via NAc glutamatergic projections. This study has investigated the involvement of NAc shell dopaminergic system in prelimbic NMDA-induced anxiolytic-like behaviors.
Method Elevated plus-maze apparatus was employed to test parameters of anxiety-like behaviors in male Wistar rats.
Results Unilateral intra-prelimbic injection of NMDA (0.9 μg/μl) but not D-AP7 (NMDA receptor antagonist; 0.25, 0.5 and 1 μg/μl) induced anxiolytic-like behaviors which was blocked by D-AP7. Moreover, unilateral infusion of SCH23390 (dopamine D1 receptor antagonist; 0.25, 0.5 and 1 μg/μl) and quinpirole (dopamine D2 receptor agonist; 0.125, 0.25 and 0.5 μg/μl) into the left NAc shell, did not alter anxiety-like behaviors. However, injection of SKF38393 (dopamine D1 receptor agonist; 3 μg/μl) and sulpiride (dopamine D2 receptor antagonist; 0.4 and 0.6 μg/μl) into the left NAc shell, likewise induced anxiolytic-like behaviors which were blocked by SCH23390 (0.25 μg/μl) and SKF96365 (Ca-channel blocker; 0.125 μg/μl)/SCH23390 (0.25 μg/μl), respectively. Furthermore, infusion of the subthreshold dose of SCH23390 (0.25 μg/μl) or quinpirole (0.25 μg/μl) into the left NAc shell, reduced while did not alter intra-prelimbic NMDA-induced anxiolytic-like behaviors, respectively. In addition, intra-NAc shell administration of the subthreshold dose of SKF38393 (1 μg/μl) or sulpiride (0.2 μg/μl), potentiated the lower dose response, while decreased the higher dose intra-left prelimbic NMDA response.
Conclusion Our results suggested a modulatory effect of the NAc shell dopaminergic system on prelimbic NMDA-induced anxiolytic-like behaviors.

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