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Psychopharmacology

, Volume 191, Issue 3, pp 835–842 | Cite as

Medial prefrontal cortical alpha1 adrenoreceptor modulation of the nucleus accumbens dopamine response to stress in Long–Evans rats

  • Brid NicNiocaill
  • Alain GrattonEmail author
Original Investigation

Abstract

Rationale

The medial prefrontal cortex (PFC) receives stress-sensitive dopamine (DA) and noradrenergic (NE) projections from the ventral tegmental area and locus coeruleus, respectively, and evidence from various sources point to a complex functional interaction between these two systems. Stress will also stimulate DA transmission in the nucleus accumbens (NAcc), and our previous work has shown that this response is under the indirect inhibitory control of a DA-sensitive mechanism in PFC.

Objective

We examined the possibility that the NAcc DA stress response is also modulated by prefrontal cortical NE.

Materials and methods

We used voltammetry to study in freely behaving rats the effects of local applications of alpha1 (benoxathian 0.1, 1, 10 nmol), alpha2 (SKF86466), and beta1/2 (alprenolol) receptor selective antagonists into the PFC on the NAcc DA response to tail-pinch stress.

Results

The NAcc DA stress response was dose-dependently inhibited by local PFC blockade of alpha1 receptors. Additional tests revealed, however, that the DA stress response in NAcc is unaffected after local alpha1 receptor activation with cirazoline. Furthermore, at equivalent doses, neither alpha2 nor beta1/2 receptor blockade significantly affected the NAcc DA stress response.

Conclusions

These data indicate that stress-induced activation of subcortical DA transmission is modulated by the NE input to PFC acting at alpha1 receptors. They suggest that, under normal circumstances, this system exerts a facilitatory or enabling influence on the NAcc DA stress response.

Keywords

Voltammetry Benoxathian SKF86466 Cirazoline Alprenolol 

Notes

Acknowledgment

This research was funded by a Canadian Institutes of Health Research grant to A.G.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  1. 1.Douglas Hospital Research Center, Department of PsychiatryMcGill UniversityMontréal (Verdun)Canada

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