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Research Article| Volume 30, ISSUE 11, P1122-1130, December 01, 1991

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β-adrenoceptors and antidepressants: Possible 2-phenylethylamine mediation of chronic phenelzine effects

  • David J. McManus
    Footnotes
    Affiliations
    From the Neurochemical Research Unit and PMHAC Research Unit, Department of Psychiatry, University of Alberta, Edmonton, Alberta, USA
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  • Darrell D. Mousseau
    Footnotes
    Affiliations
    From the Neurochemical Research Unit and PMHAC Research Unit, Department of Psychiatry, University of Alberta, Edmonton, Alberta, USA
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  • Paul R. Paetsch
    Footnotes
    Affiliations
    From the Neurochemical Research Unit and PMHAC Research Unit, Department of Psychiatry, University of Alberta, Edmonton, Alberta, USA
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  • Thomas B. Wishart
    Footnotes
    Affiliations
    From the Neurochemical Research Unit and PMHAC Research Unit, Department of Psychiatry, University of Alberta, Edmonton, Alberta, USA
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  • Andrew J. Greenshaw
    Correspondence
    Address reprint requests to A.J. Greenshaw, Neurochemical Research Unit, Department of Psychiatry, University of Alberta, Edmonton, Alberta T6G 2B7, Canada.
    Footnotes
    Affiliations
    Department of Psychology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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  • Author Footnotes
    1 DJM is the recipient of an AHFMR studentship
    4 The authors wish to thank Dr. G.B. Baker for his comments on aspects of this research, Dr. James Wong for his excellent technical assistance, and Ms. S. Omura for her efficient typing of this manuscript.
    2 PRP is the recipient of a MRC studentship
    3 AJG is a Heritage Medical Scholar.
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      Abstract

      Effects of chronic administration of antidepressant drugs on β-adrenoceptor function were assessed. Tricyclics (imipramine 30 mg/kg/day, desipramine 5 and 10 mg/kg/day) and monoamine oxidase inhibitors [(±)-tranylcypromine 1 mg/kg/day, phenelzine 5 and 10 mg/kg/day] were administered to Male Sprague-Dawley rats (n = 8), via Alzet 2ML2 osmotic minipumps for 28 days. Pumps were implanted subcutaneously in the interscapular region and replaced after 14 days. On days 21 and 22 motor-suppressant actions of the β-adrenoceptor agonist salbutamol (3 mg/kg intraperitoneally [IP]) were assessed as a measure of β-adrenergic receptor sensitivity. On day 28 the animals were killed and their brains used for measurement of drug levels and monoamine oxidase activity. Liver tissue was used to measure the trace amine 2-phenylethylamine. Each drug induced a decrease in the response to salbutamol. With phenelzine the decreased response to salbutamol was not observed at the lower dose. Differences in monoamine oxidase inhibition following phenelzine did not correspond to differential effects on functional β-adrenergic sensitivity. Levels of 2-phenylethylamine, an endogenous amine that is also a metabolite of phenelzine, were significantly higher in the 10-mg/kg/day phenelzine group. These data suggest that 2-phenylethylamine may be one mediator of the chronic actions of phenelzine on β-adrenoceptors.
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