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Rapid decrease in rat brain beta adrenergic receptor binding during combined antidepressant alpha-2 antagonist

J A Scott, F T Crews

    The Journal of Pharmacology and Experimental Therapeutics
    |March 1, 1983
    PubMed
    Summary
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    Combining antidepressants with alpha-2 adrenergic antagonists accelerates the decrease in beta adrenergic receptors. This enhanced desensitization may speed up antidepressant therapeutic effects by increasing norepinephrine.

    Area of Science:

    • Neuropharmacology
    • Adrenergic Receptor Signaling

    Background:

    • Therapeutic effects of antidepressants are delayed, potentially due to decreased central beta-adrenergic receptor density.
    • This decrease may stem from increased norepinephrine secondary to reduced alpha-2 adrenergic receptor sensitivity.

    Purpose of the Study:

    • To investigate if alpha-2 adrenergic antagonists accelerate antidepressant-induced beta-adrenergic receptor desensitization.
    • To explore the impact of combined alpha-2 antagonist and antidepressant administration on receptor density.

    Main Methods:

    • Administration of desipramine (DMI) alone and in combination with alpha-2 antagonists (phenoxybenzamine, yohimbine, dihydroergotamine) or alpha-1 antagonist (prazosin) to rats.
    • Measurement of beta-adrenergic receptor density in rat brain regions (limbic cortex, hippocampus, mesencephalon).

    Related Experiment Videos

  • Assessment of accelerated desensitization with other antidepressants (amitriptyline, mianserin, iprindole, tranylcypromine, pargyline) combined with alpha-2 antagonists.

    • Main Results:

    • Combined administration of DMI and phenoxybenzamine markedly decreased beta-adrenergic receptor density after one day, unlike DMI alone.
    • Rapid desensitization was observed in multiple brain regions.
    • Alpha-2 antagonists (yohimbine, dihydroergotamine) similarly accelerated DMI-induced desensitization, while the alpha-1 antagonist prazosin had no effect.
    • Alpha-2 antagonists also accelerated desensitization induced by other antidepressants.

    Conclusions:

    • Pharmacological blockade of alpha-2 adrenergic receptors significantly enhances antidepressant-induced decreases in central nervous system beta-adrenergic receptor density.
    • This finding suggests a potential strategy for accelerating antidepressant action.