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Naloxone-induced hypodipsia: a CNS mapping study.

D A Czech, E A Stein, M J Blake

    Life Sciences
    |August 22, 1983
    PubMed
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    Opiate antagonists like naloxone reduce drinking behavior by acting on specific brain areas. This study found naloxone effectively suppressed water intake when injected into the lateral hypothalamus, preoptic area, and zona incerta in rats.

    Area of Science:

    • Neuroscience
    • Behavioral Pharmacology

    Background:

    • Opiate antagonists attenuate drinking behavior.
    • Research suggests a central site of action for this antidipsogenic effect.

    Purpose of the Study:

    • To investigate the site specificity of naloxone's antidipsogenic effect.
    • To determine which discrete subcortical areas are critical for naloxone's effect on drinking behavior.

    Main Methods:

    • Naloxone was microinjected into various subcortical sites in water-deprived rats.
    • Water intake was measured at multiple time points post-injection.
    • Comparisons were made between naloxone and saline control injections.

    Main Results:

    • Naloxone reliably depressed water intake in a dose-dependent manner when injected into the lateral hypothalamus, preoptic area, and zona incerta.

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  • Injection into other sites like the lateral ventricle, nucleus accumbens, substantia nigra, and cortex/corpus callosum was generally ineffective.
  • Naloxone did not affect the latency to drink, irrespective of injection site or dose.

    • Conclusions:

    • The lateral hypothalamus, preoptic area, and zona incerta are key sites mediating the antidipsogenic effects of naloxone.
    • Opioid systems in these specific brain regions influence the maintenance and termination of drinking, rather than its initiation.