Cited by 69Neurotransmitter Receptor Influence on BehaviorNeuropeptides and Animal PhysiologyPain Mechanisms and Treatments

Increased running response to morphine in morphine-pretreated mice.

Shuster, L, Webster, G W, Yu, G·1975·The Journal of Pharmacology and Experimental Therapeutics

Abstract

The running response of B6AF1/J mice to 25 mg/kg of morphine sulfate was increased up to 3-fold when this dose was administered either twice daily for 5 days or once a week for 2 or 3 weeks. The effect of weekly pretreatment was proportional to the dose of morphine and lasted as long as 1 month after pretreatment was stopped. There was no sensitization when the mice were less than 15 days old at the time of pretreatment. Of the parental strains, untreated C57Bl/6J mice showed a good running response to morphine, while A/J mice showed little response. Pretreatment of either of these strains produced only slight sensitization. Pretreatment of the hybrids with levorphanol increased the response to morphine. Dextrorphan and naloxone were ineffective. Sensitization by morphine was blocked by naloxone. Increased morphine running was not associated with analgesic tolerance as measured by the tail-flick assay. Morphine pretreatment produced some increase in the running response to amphetamine and to cocaine. Pretreatment with amphetamine or cocaine did not increase the response to morphine.

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Crossref · 10.1016/s0022-3565(25)30031-5

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Authors
Shuster, L., Webster, G. W., & Yu, G.
Venue
The Journal of Pharmacology and Experimental Therapeutics
Publisher
Elsevier BV
Published
1975-01
Volume
192
Issue
1
Pages
64-72
ISSN
0022-3565 (ISSN-L)
OpenAlex
W1924136303
Cited by
68
References
0
Citations by year
2026: 1 · 2022: 2 · 2020: 1 · 2019: 1 · 2018: 3 · 2017: 1 · 2016: 1 · 2015: 4 · 2014: 1
FWCI
1.63
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Pharmacology and Experimental Therapeutics (publishedVersion)
  • PubMed (publishedVersion)
  • The Mouseion at the JAXlibrary (Jackson Laboratory) (submittedVersion)
  • PubMed
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
Keywords
morphine, morphine sensitization, naloxone, analgesic tolerance, strain differences, C57BL/6J mice, A/J mice, levorphanol, amphetamine, cocaine, locomotor activity
MeSH terms
Aging, Analgesics, Opioid, Animals, Animals, Newborn, Cocaine, Dextroamphetamine, Dose-Response Relationship, Drug, Drug Tolerance, Female, Hot Temperature, Levorphanol, Male, Mice, Inbred A, Mice, Inbred C57BL, Morphine, Motor Activity, Naloxone, Reaction Time, Species Specificity, Stereoisomerism, Stimulation, Chemical, Time Factors, Mice

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