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Dopamine autoreceptor agonists including CGS 15855A decrease dopamine release and metabolism in mouse brain.

C A Altar, W C Boyar, P L Wood

    European Journal of Pharmacology
    |February 24, 1987
    PubMed
    Summary
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    Dopamine autoreceptor agonists suppress dopamine release and metabolism in mice, providing neurochemical evidence for these receptors. The novel agonist CGS 15855A demonstrated sustained effects without tolerance.

    Area of Science:

    • Neuropharmacology
    • Neurochemistry
    • Dopaminergic system research

    Background:

    • Dopamine autoreceptors regulate dopamine release and metabolism.
    • Evidence for dopamine autoreceptors in mice was previously lacking.
    • Understanding autoreceptor function is crucial for dopaminergic system modulation.

    Purpose of the Study:

    • To provide neurochemical evidence for dopamine autoreceptors in the mouse brain.
    • To investigate the effects of various dopamine autoreceptor agonists on dopamine release and metabolism.
    • To characterize the pharmacological specificity and duration of action of the novel agonist CGS 15855A.

    Main Methods:

    • Measurement of steady-state levels of 3-methoxytyramine (3-MT), dihydroxyphenylacetic acid (DOPAC), and homovanillic acid (HVA) in mouse brain.

    Related Experiment Videos

  • Administration of dopamine autoreceptor agonists, including CGS 15855A, to assess their impact on dopamine metabolites.
  • Comparison of agonist potency and efficacy across different dopamine metabolites and brain regions (striatum, limbic).

    • Main Results:

    • Several dopamine autoreceptor agonists, including CGS 15855A, decreased 3-MT levels, indicating suppressed dopamine release and metabolism.
    • CGS 15855A demonstrated comparable efficacy in both rat and mouse neostriatum and showed sustained suppression of dopamine release/metabolism for over 3.5 hours without acute tolerance.
    • The (+) optical isomer of CGS 15855A was responsible for the autoreceptor efficacy, and effects on 3-MT were more pronounced than on DOPAC or HVA.

    Conclusions:

    • The study provides the first neurochemical evidence for functional dopamine autoreceptors in the mouse brain.
    • Dopamine release and metabolism in mouse limbic and striatal regions are regulated by autoreceptors with similar pharmacological properties to those in rats.
    • The novel agonist CGS 15855A is a potent and effective dopamine autoreceptor agonist with sustained action, offering potential for further research.