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Related Experiment Videos

Functional alterations in dopamine systems assessed using drug discrimination procedures

D A Cory-Slechta1, D V Widzowski, M J Pokora

  • 1Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry, New York 14642.

Neurotoxicology
|January 1, 1993
PubMed
Summary

Lead (Pb) exposure causes dopamine (DA) system changes, leading to behavioral impairments. Studies show Pb exposure induces DA supersensitivity at D1 and D2 receptors, particularly in the nucleus accumbens.

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Area of Science:

  • Neuroscience
  • Toxicology
  • Pharmacology

Background:

  • Lead (Pb) exposure is linked to behavioral deficits.
  • Dopamine (DA) system dysregulation is implicated in Pb-induced impairments.
  • Previous research has not precisely defined Pb's effects on DA systems or their behavioral consequences.

Purpose of the Study:

  • To investigate the precise effects of low-level lead exposure on dopamine receptor systems.
  • To correlate biochemical changes in DA receptors with behavioral outcomes.
  • To elucidate the neurobiological mechanisms underlying Pb-induced behavioral changes.

Main Methods:

  • Drug discrimination procedures were used to assess functional DA supersensitivity.
  • Receptor binding assays were performed on D1 and D2 receptors in five brain regions.

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  • Analysis focused on the striatum, nucleus accumbens, frontal cortex, midbrain, and cerebellum.

    • Main Results:

    • Low-level postweaning Pb exposure induced functional DA supersensitivity at both D1 and D2 receptor subtypes.
    • Postnatal Pb exposure resulted in D2 receptor subtype-specific functional DA supersensitivity.
    • Receptor binding assays indicated a correlation between D2 DA behavioral supersensitivity and Bmax changes in the nucleus accumbens.

    Conclusions:

    • Lead exposure can induce functional dopamine supersensitivity, impacting D1 and D2 receptor subtypes.
    • The nucleus accumbens may be a key brain region for Pb-induced DA supersensitivity.
    • Pb exposure might lead to net functional autoreceptor agonism, contributing to observed behavioral effects.