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Benzodiazepine receptors.

C Braestrup, M Nielsen

    Arzneimittel-Forschung
    |January 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Researchers identified a high-affinity binding site for benzodiazepines in vertebrate brains, suggesting a specific receptor. A novel endogenous ligand with high affinity for these benzodiazepine receptors was also discovered.

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    Area of Science:

    • Neuroscience
    • Pharmacology

    Background:

    • Benzodiazepines are psychoactive drugs known to bind to specific sites in the brain.
    • Previous research indicated a single class of saturable binding sites for benzodiazepines across vertebrate brains.

    Purpose of the Study:

    • To confirm the physiological relevance of benzodiazepine binding sites.
    • To investigate the distribution of benzodiazepine receptors in the human brain.
    • To identify potential endogenous ligands for benzodiazepine receptors.

    Main Methods:

    • Radioligand binding assays using 3H-diazepam and 3H-flunitrazepam.
    • Pharmacological correlation of drug effects with binding affinities.
    • Brain tissue analysis to determine receptor distribution and isolate potential ligands.

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    Main Results:

    • A strong correlation was found between benzodiazepine drug effects and their binding affinity, confirming the sites as physiological receptors.
    • Benzodiazepine receptors are most concentrated in human cerebral cortical regions, with lower levels in midbrain, limbic structures, and white matter.
    • While hypoxanthine, inosine, and nicotinamide showed weak binding, a novel lipophilic, small-molecule aromatic compound isolated from human brain and urine exhibited very high affinity (Ki ≈ 0.003 μmol/L) for these receptors.

    Conclusions:

    • Benzodiazepine binding sites represent the physiological receptors for these drugs, with preferential action in cortical areas.
    • The discovery of a high-affinity endogenous ligand suggests a natural role for the benzodiazepine receptor system.