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Related Experiment Videos

Locomotor activity in morphine-dependent and post-dependent rats

L S Brady, S G Holtzman

    Pharmacology, Biochemistry, and Behavior
    |March 1, 1981
    PubMed
    Summary

    Chronic morphine exposure alters rat behavior, showing tolerance to sedative effects but not stimulant effects. This suggests distinct neural pathways for morphine

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    Pharmacology, biochemistry, and behavior·2001

    Area of Science:

    • Neuroscience
    • Pharmacology
    • Behavioral Science

    Background:

    • Opioid dependence is a significant public health issue.
    • Understanding the long-term neurobiological effects of chronic opioid use is crucial for developing effective treatments.
    • Morphine, a potent opioid analgesic, is widely used but carries a high risk of dependence.

    Purpose of the Study:

    • To investigate the long-term effects of chronic morphine administration on locomotor activity in rats.
    • To compare the behavioral responses of non-dependent, morphine-dependent, and post-dependent rats to morphine and naloxone.
    • To explore the neurobiological substrates underlying morphine's stimulant and depressant effects on locomotion.

    Main Methods:

    • Morphine dependence was induced and maintained in rats for 30 weeks.
    • Locomotor activity was measured in response to varying doses of morphine and naloxone.
    • Tolerance and withdrawal symptoms were assessed in dependent and post-dependent animals.

    Main Results:

    • Low-dose morphine increased locomotor activity, while high doses decreased it in non-dependent and dependent rats.
    • Naloxone antagonized both the stimulant and depressant effects of morphine.
    • Chronic morphine led to tolerance to the depressant but not the stimulant effects.
    • Post-dependent rats remained tolerant to morphine's depressant effects.
    • Withdrawal or naloxone administration disrupted locomotor activity.

    Conclusions:

    • Chronic morphine administration induces lasting changes in behavioral sensitivity to morphine and naloxone.
    • The differential development of tolerance suggests distinct neuronal mechanisms for morphine's stimulant and depressant actions.
    • These findings have implications for understanding opioid addiction and developing targeted interventions.

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