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(+)-Amphetamine binding to rat hypothalamus: relation to anorexic potency for phenylethylamines

S M Paul, B Hulihan-Giblin, P Skolnick

    Science (New York, N.Y.)
    |October 29, 1982
    PubMed
    Summary

    Researchers found specific binding sites for amphetamine in rat brains, particularly in the hypothalamus. These sites are linked to amphetamine

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    Area of Science:

    • Neuroscience
    • Pharmacology

    Background:

    • Amphetamine exhibits anorexic effects.
    • The precise mechanism of amphetamine's action, particularly its appetite-suppressing properties, remains incompletely understood.

    Purpose of the Study:

    • To investigate the existence and characteristics of specific binding sites for amphetamine in rat brain tissue.
    • To determine if these binding sites are associated with known neurotransmitter receptors.
    • To explore the correlation between amphetamine binding affinity and its anorexic potency.

    Main Methods:

    • Utilized radioligand binding assays with (+)-[3H]amphetamine on rat brain membrane preparations.
    • Performed Scatchard analysis to characterize binding sites.
    • Tested the displacement of (+)-[3H]amphetamine binding by various drugs and neurotransmitters.

    Main Results:

    • Identified saturable and stereospecific binding sites for (+)-[3H]amphetamine in rat brain membranes.
    • Observed highest binding site density in the hypothalamus and brainstem.
    • Characterized two distinct binding sites in the hypothalamus with different affinity constants.
    • Demonstrated that these sites are specific for amphetamine and related phenylethylamines, not associated with known receptors.
    • Found a strong correlation between the affinity of phenylethylamine derivatives for these sites and their anorexic potency.

    Conclusions:

    • The study suggests the presence of specific amphetamine receptor sites in the hypothalamus.
    • These hypothalamic receptor sites are likely involved in mediating the anorexic effects of amphetamine and related compounds.
    • This finding provides a potential molecular target for understanding and developing appetite-regulating drugs.

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