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Psychopharmacology

, Volume 171, Issue 2, pp 191–198 | Cite as

Electrolytic lesions and pharmacological inhibition of the dorsal raphe nucleus prevent stressor potentiation of morphine conditioned place preference in rats

  • Matthew J. Will
  • Andre Der-Avakian
  • Sondra T. Bland
  • Ruth E. Grahn
  • Sayamwong E. Hammack
  • Peter D. Sparks
  • Julie L. Pepin
  • Linda R. Watkins
  • Steven F. MaierEmail author
Original Investigation

Abstract

Rationale

Exposure to a single session of uncontrollable inescapable shock (IS), but not to identical controllable escapable shock, produces a potentiation of morphine's rewarding properties that is unusual in that the stressor can be given a number of days before the drug administration in an environment quite different from the drug context. Many other behavioral outcomes of stressors that depend on the uncontrollability of the stressor are mediated by alterations in serotonergic (5-HT) neurons within the dorsal raphe nucleus (DRN).

Objectives

The present experiments examined the role of the DRN and 5-HT in mediating the effect of IS on the rewarding properties of morphine as assessed by conditioned place preference (CPP).

Methods

In experiment 1, subjects received small electrolytic lesions of the DRN and were tested for morphine (3.0 mg/kg, SC) CPP after IS or control treatment. In experiment 2, subjects received an intra-DRN microinjection of the 5-HT1A agonist 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT, 1.0 μg/0.5 μl) either before IS or before morphine (3.0 mg/kg, SC) injections during CPP testing.

Results

IS potentiated morphine CPP in controls, but both DRN lesion and intra-DRN 8-OH-DPAT, either before IS or before morphine administration, completely blocked this effect.

Conclusions

These data implicate alterations in DRN 5-HT neurons in the potentiation of morphine reward produced by uncontrollable stress.

Keywords

Reward Uncontrollable stress Serotonin 5-HT 8-OH-DPAT Electrolytic lesion 

Notes

Acknowledgements

This research was supported by NIDA grant DA13159.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Matthew J. Will
    • 1
  • Andre Der-Avakian
    • 2
  • Sondra T. Bland
    • 2
  • Ruth E. Grahn
    • 3
  • Sayamwong E. Hammack
    • 4
  • Peter D. Sparks
    • 2
  • Julie L. Pepin
    • 2
  • Linda R. Watkins
    • 2
  • Steven F. Maier
    • 2
    Email author
  1. 1.Department of PsychiatryUniversity of Wisconsin—Madison Medical SchoolMadisonUSA
  2. 2.Department of Psychology and Center for NeuroscienceUniversity of Colorado at BoulderBoulderUSA
  3. 3.Department of PsychologyConnecticut CollegeNew LondonUSA
  4. 4.Department of PsychiatryEmory University School of MedicineAtlantaUSA

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