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Drug Abuse and Addiction: Pharmacological Phenomena01:15

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Drug dependence, abuse, and addiction are complex phenomena that can precipitate various abnormal states. Physical dependence refers to a state of pharmacological adaptation to a drug. This adaptation often results in tolerance—a reduced response to the drug after repeated administrations. When the drug use is abruptly stopped, withdrawal symptoms occur due to the body's need to readjust from the pharmacologically induced imbalance. However, tolerance and withdrawal symptoms do not...
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Opioid receptors, including the mu (μ, MOR), delta (δ, DOR), and kappa (κ, KOR) types, belong to the rhodopsin family of G protein-coupled receptors. These receptors are located throughout the central and peripheral nervous systems and in non-neuronal tissues such as macrophages and astrocytes. Opioid receptor ligands can be categorized into agonists or antagonists. Highly selective agonists include [d-Ala2, MePhe4, Gly(ol)5]-enkephalin or DAMGO for MOR, [D-Pen2,...
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Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...
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Opioids are a class of drugs that mimic endogenous opioid peptides and act on opioid receptors, and help in pain relief. These compounds are classified as natural, synthetic, or semi-synthetic. Natural opioids, like morphine, codeine, and thebaine, are derived from the opium poppy plant (Papaver somniferum or Papaver album) and are termed opiates. Synthetic opioids are artificial, while semi-synthetic opioids combine natural and synthetic compounds. Morphine, a prototypical opioid, possesses a...
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Pavlovian conditioning analysis of morphine tolerance.

S Siegel

    NIDA Research Monograph
    |January 1, 1978
    PubMed
    Summary

    Drug tolerance, particularly to morphine, can be understood through a conditioning analysis. Environmental cues associated with drug administration trigger compensatory responses that reduce the drug's effects, demonstrating a learned aspect of tolerance.

    Area of Science:

    • Pharmacology
    • Neuroscience
    • Behavioral Science

    Background:

    • Conditional responses to drugs often oppose their direct effects.
    • Morphine tolerance involves compensatory responses triggered by administration cues.

    Purpose of the Study:

    • To support the compensatory conditioning model of drug tolerance.
    • To explore parallels between learning processes and morphine tolerance.

    Main Methods:

    • Summarizing research on environmental specificity of tolerance.
    • Analyzing the effects of non-pharmacological manipulations (extinction, partial reinforcement, latent inhibition) on tolerance.
    • Comparing learning and tolerance regarding retention, disruption, and facilitation.

    Main Results:

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    • Tolerance to morphine is demonstrated to be environmentally specific.
    • Learned factors like extinction, partial reinforcement, and latent inhibition influence morphine tolerance.
    • Morphine tolerance shares characteristics with learning, including retention, disruption by brain stimulation, and sensitivity to protein synthesis inhibitors.

    Conclusions:

    • The compensatory conditioning model provides a framework for understanding drug tolerance.
    • Drug tolerance is significantly influenced by learned associations and environmental cues.
    • Further research highlights deep parallels between the neurobiological mechanisms of learning and drug tolerance.