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Neuropeptides differentially effect various forms of morphine tolerance.

R F Ritzmann, K A Steece, J M Lee

    Neuropeptides
    |June 1, 1985
    PubMed
    Summary

    Two forms of morphine tolerance were identified: environment-dependent (ED) and environment-independent (EI). Arginine vasopressin (AVP) influenced ED tolerance, while cyclo (Leu-Gly) (cLG) affected EI tolerance, revealing distinct mechanisms.

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    Area of Science:

    • Pharmacology
    • Neuroscience
    • Behavioral Science

    Background:

    • Morphine tolerance can manifest in different ways, impacting drug efficacy.
    • Understanding the mechanisms of tolerance is crucial for effective pain management and addiction treatment.

    Purpose of the Study:

    • To differentiate between environment-dependent (ED) and environment-independent (EI) forms of morphine tolerance.
    • To investigate the roles of arginine vasopressin (AVP) and cyclo (Leu-Gly) (cLG) in modulating these tolerance forms.

    Main Methods:

    • ED tolerance was induced using a cue-preceded (orange scent) intraperitoneal (ip) morphine injection model.
    • EI tolerance was induced via a pellet implant method, ensuring tolerance regardless of administration route.
    • The effects of AVP and cLG on the development of ED and EI tolerance were assessed.

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    Main Results:

    • ED tolerance was evident after ip injections but diminished with intracerebroventricular (icv) administration, suggesting dispositional tolerance.
    • EI tolerance persisted across different administration routes, indicating functional tolerance.
    • AVP facilitated ED tolerance development, while cLG blocked EI tolerance development.

    Conclusions:

    • Morphine tolerance is not monolithic, with distinct ED and EI forms exhibiting different characteristics.
    • AVP and cLG act as specific modulators for ED and EI tolerance, respectively.
    • ED tolerance appears to be dispositional, whereas EI tolerance is functional, based on brain morphine levels.