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Multiple receptors for brain dopamine.

M Titeler, P Weinreich, D Sinclair

    Proceedings of the National Academy of Sciences of the United States of America
    |March 1, 1978
    PubMed
    Summary
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    This study provides evidence for multiple dopamine receptor subtypes in calf brain caudate nucleus. Researchers used radioligands to show distinct binding sites for dopamine agonists and antagonists.

    Area of Science:

    • Neuroscience
    • Pharmacology

    Background:

    • Dopaminergic binding sites are crucial for neurotransmission in the brain.
    • Previous research suggested heterogeneity in dopaminergic receptor populations.

    Purpose of the Study:

    • To investigate the existence of multiple dopaminergic binding sites in calf brain caudate nucleus homogenates.
    • To characterize the binding properties of different dopaminergic ligands.

    Main Methods:

    • Utilized five different radioligands to probe dopaminergic sites.
    • Performed inhibition assays using known dopaminergic drugs and neurotransmitters.
    • Analyzed binding data to determine the number and affinity of receptor sites.

    Main Results:

    • Inhibition curves for agonist radioligands ([3H]dopamine, [3H]apomorphine) by antagonists were biphasic.

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  • Inhibition curves for antagonist radioligands ([3H]haloperidol, [3H]spiroperidol, [3H]dihydroergocryptine) by dopamine were also biphasic.
  • These biphasic inhibitions suggest the presence of at least two distinct dopaminergic binding sites with high affinity.

    • Conclusions:

    • The findings support the hypothesis of multiple dopaminergic binding sites in the caudate nucleus.
    • Both agonist and antagonist radioligands indicate the presence of two high-affinity dopaminergic sites.