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Related Experiment Videos

Behavioral sensitization to methamphetamine in the rat: an ontogenic study.

Y Fujiwara, Y Kazahaya, M Nakashima

    Psychopharmacology
    |January 1, 1987
    PubMed
    Summary

    Repeated methamphetamine exposure during specific young rat developmental periods is crucial for inducing behavioral sensitization. This hypersensitivity emerges during later developmental stages, linked to dopamine autoreceptor formation.

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    Area of Science:

    • Neuroscience
    • Developmental Psychology
    • Pharmacology

    Background:

    • Methamphetamine (MAP) exposure during development can have lasting effects.
    • Understanding the critical developmental window for MAP sensitization is essential.

    Purpose of the Study:

    • To determine the specific ontogenetic period in young rats critical for developing behavioral sensitization to MAP.
    • To correlate this period with neurodevelopmental milestones in the dopamine system.

    Main Methods:

    • Young rats received daily MAP injections (2 mg/kg) during distinct postnatal periods (days 2-6, 7-11, 12-16, 17-21, 22-26, 27-31).
    • Control groups received saline.
    • Locomotor activity and stereotyped behaviors were assessed after a MAP challenge on postnatal day 35.

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    Main Results:

    • Behavioral sensitization to MAP was not observed in rats treated during early postnatal days (2-21).
    • Hypersensitivity to MAP, including increased locomotor activity and stereotyped behavior, was evident in rats treated during later periods (postnatal days 22-31).
    • Responsiveness to MAP was noted after postnatal day 2, but sensitization required later exposure.

    Conclusions:

    • The critical period for developing behavioral sensitization to MAP in rats occurs between postnatal days 22 and 31.
    • This developmental window aligns with the formation of presynaptic dopamine autoreceptors in the rat brain.
    • Early life MAP exposure timing significantly influences long-term behavioral responses and neurodevelopmental outcomes.