ArticlePsychopharmacology2021
Morphine and ethanol pretreatment effects on expression and extinction of ethanol-induced conditioned place preference and aversion in mice.
Article in Psychopharmacology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
4 citing papers in PubMed, 10 citations in OpenAlex.
- Stressed Avoider rats show blunted sensitivity to alcohol's aversive effects: Potential contributions of the lateral habenula and lateral hypothalamus.bioRxiv : the preprint server for biology · 2025Article
- The Role of Endogenous Beta-Endorphin and Enkephalins in the Crosstalk Between Ethanol and Morphine.Pharmaceuticals (Basel, Switzerland) · 2025Article
- Transcranial direct current stimulation (tDCS) reduces motivation to drink ethanol and reacquisition of ethanol self-administration in female mice.Scientific reports · 2022Article
- Morphine pretreatment protects against cerebral ischemic injury via a cPKCγ-mediated anti-apoptosis pathway.Experimental and therapeutic medicine · 2021Article
Corrections and comments
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Authors and funding
4 authors at 2 institutions in 1 country.
Funding
Abstract
rationaleOpioid receptor antagonists reliably alter the expression or extinction of ethanol's conditioned motivational effects as indexed by the place conditioning procedure, suggesting endogenous opioids are normally involved. These studies examined how exogenous stimulation of opioid receptors alters ethanol's conditioned rewarding and aversive effects.
objectivesDrugs that either directly (morphine) or indirectly (ethanol) stimulate opioid receptors were tested for their effects on the expression and extinction of ethanol-induced conditioned place preference (CPP) and conditioned place aversion (CPA).
methodsMale DBA/2J mice were exposed to unbiased ethanol (2 g/kg) conditioning procedures that produced either CPP (experiments 1-2) or CPA (experiments 3-4). Morphine (0, 2.5, 5, or 10 mg/kg) was injected before three post-conditioning tests in experiments 1 and 3, whereas ethanol (0, 1, 2, or 3 g/kg) was injected before tests in experiments 2 and 4. All groups received vehicle on test 4 to determine whether the drug pretreatments altered the course of extinction.
resultsMorphine dose-dependently enhanced CPP expression (experiment 1), but ethanol dose-dependently reduced CPP expression (experiment 2). Test 4 showed no differences between drug-treated mice and mice given vehicle on all tests. Morphine had no effect on expression or extinction of ethanol-induced CPA (experiment 3). The highest ethanol dose (3 g/kg) interfered with CPA expression, but not extinction (experiment 4).
conclusionsPretreatment drug effects on ethanol CPP and CPA expression were most likely a byproduct of their activity altering effects rather than opioid-receptor mediated modulation of ethanol's conditioned motivational effects. Neither drug affected the course of extinction.
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Registered trials
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