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Naltrexone's influence on neurobehavioral development.

I S Zagon, P J McLaughlin

    Pharmacology, Biochemistry, and Behavior
    |March 1, 1985
    PubMed
    Summary
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    Naltrexone administration in preweaning rats altered the timing of motor behavior development. High doses accelerated development, while low doses delayed it, suggesting opioid system involvement in neurobehavioral ontogeny.

    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Pharmacology

    Background:

    • The role of endogenous opioid systems in neurobehavioral development is not fully understood.
    • Naltrexone, an opioid antagonist, can impact development when administered early in life.

    Purpose of the Study:

    • To investigate the effects of chronic naltrexone administration on the ontogeny of spontaneous motor and sensorimotor behaviors in preweaning rats.
    • To assess the impact of naltrexone on ambulation, emotionality, and nociception at weaning.

    Main Methods:

    • Rats received chronic administration of 1 or 50 mg/kg naltrexone from birth to day 21.
    • Developmental milestones for spontaneous motor behaviors were recorded.
    • Ambulation, emotionality, and nociceptive responses were evaluated at weaning.

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    Main Results:

    • The onset and full emergence of spontaneous motor behaviors were accelerated by 50 mg/kg naltrexone and delayed by 1 mg/kg naltrexone.
    • General ambulation, emotionality, and nociceptive responses were largely unaffected.
    • Face-washing frequency and activity cage performance showed some deviations from control levels.

    Conclusions:

    • Endogenous opioid systems may play a regulatory role in neurobehavioral development.
    • Further research is needed to determine if observed changes are due to naltrexone's somatic effects or direct impact on the endorphin-opiate system.