Cited by 338Neurotransmitter Receptor Influence on BehaviorNeuropeptides and Animal PhysiologyNeuroscience and Neuropharmacology Research

Morphine reward in dopamine-deficient mice

Hnasko, Thomas S., Sotak, Bethany N., Palmiter, Richard D.·2005·Nature

Abstract

Dopamine has been widely implicated as a mediator of many of the behavioural responses to drugs of abuse. To test the hypothesis that dopamine is an essential mediator of various opiate-induced responses, we administered morphine to mice unable to synthesize dopamine. We found that dopamine-deficient mice are unable to mount a normal locomotor response to morphine, but a small dopamine-independent increase in locomotion remains. Dopamine-deficient mice have a rightward shift in the dose-response curve to morphine on the tail-flick test (a pain sensitivity assay), suggesting either a decreased sensitivity to the analgesic effects of morphine and/or basal hyperalgesia. In contrast, dopamine-deficient mice display a robust conditioned place preference for morphine when given either caffeine or l-dihydroxyphenylalanine (a dopamine precursor that restores dopamine throughout the brain) during the testing phases. Together, these data demonstrate that dopamine is a crucial component of morphine-induced locomotion, dopamine may contribute to morphine analgesia, but that dopamine is not required for morphine-induced reward as measured by conditioned place preference.

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Crossref · 10.1038/nature04172

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  • Dopamine deficient mice can learn to associate place cues and the affective action of morphine, and if treated with caffeine or L-DOPA just before the performance phase, they display a preference for the compartment paired with morphine.

    “Dopamine deficient mice can learn to associate place cues and the affective action of morphine, and if they are treated with caffeine or L-DOPA, which temporarily restores their dopamine, just before the performance phase, they display a preference for the compartment paired with morphine (Hnasko et al., 2005).”

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Authors
Hnasko, T. S., Sotak, B. N., & Palmiter, R. D.
Affiliations
  • University of Washington (US)
  • Howard Hughes Medical Institute (US)
Corresponding author
Palmiter, Richard D.
Venue
Nature
Published
2005-12
Volume
438
Issue
7069
Pages
854-857
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2033505470
Cited by
338
References
29
Citations by year
2026: 6 · 2025: 11 · 2024: 11 · 2023: 8 · 2022: 12 · 2021: 67 · 2020: 12 · 2019: 20 · 2018: 11 · 2017: 10 · 2016: 10 · 2015: 12 · 2014: 12 · 2013: 12 · 2012: 20
FWCI
7.35
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • University of Washington
  • National Institute on Drug Abuse
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
morphine reward, dopamine deficiency, conditioned place preference, morphine analgesia, tail-flick test, drug addiction, pleasure
MeSH terms
Analgesics, Opioid, Animals, Brain, Caffeine, Dihydroxyphenylalanine, Dopamine, Dose-Response Relationship, Drug, Levodopa, Morphine, Motor Activity, Pain, Reward, Tail, Tyrosine 3-Monooxygenase, Pain Threshold, Mice

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