Functional supersensitivity of CNS α1-adrenoceptors following chronic antidepressant treatment |
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Authors: | David B Menkes John H Kehne Dorothy W Gallager George K Aghajanian Michael Davis |
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Institution: | 1. Departments of Psychiatry and Pharmacology Yale University School of Medicine, USA;2. The Connecticut Mental Health Center 34 Park Street New Haven, CT 06508 U.S.A. |
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Abstract: | Chronic but not acute administration (21 days) of desipramine (10 mg/kg), amitriptyline (10 mg/kg) or iprindole (5 mg/kg) enhanced the stimulatory effect of the α1-adrenergic agonist phenylephrine on the acoustic startle reflex when phenylephrine was infused into the subarachnoid space of the spinal cord. Comparable supersensitivity to phenylephrine also occurred 1 week after selective depletion of norepinephrine in the spinal cord via intrathecal administration of 6-hydroxydopamine. Behavioral supersensitivity to phenylephrine was associated with an increase in the number of 3H-prazosin binding sites following denervation but not following chronic antidepressant treatments. The results indicate that chronic antidepressant treatments may enhance functional α1-adrenergic transmission through mechanisms different than those following denervation. |
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Keywords: | To whom all correspondence including reprint requests should be addressed |
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