title: Rapid changes in central beta-adrenergic receptors after chronic intravenous infusion of antidepressants.
abstract: The effects of intravenous infusion of desipramine (1, 3, 10, and 60 mg/kg/24 hr), amitriptyline, zimelidine, iprindole (3, 10, 30, 60, and 100 mg/kg/24 hr each), imipramine (10, 30, and 100 mg/kg/24 hr), or U-48,753E (1, 3, 10, and 30 mg/kg/24 hr) on the density of central beta-adrenergic receptors were investigated in Sprague-Dawley rats. A comparative study with oral desipramine (3 mg/kg/24 hr) for 74 hrs was also carried out. Desipramine, amitriptyline, zimelidine, iprindole, imipramine, and U-48,753E reduced the density of beta-adrenergic receptors in the cerebral cortex, and the effect seems to be dose-dependent. In the oral study, desipramine failed to down-regulate beta-adrenergic receptors. These results indicate that down-regulation of beta-adrenergic receptors can be rapidly achieved by intravenous infusion of drugs.
mesh_terms: D000284:Administration, Oral; D000818:Animals; D000928:Antidepressive Agents / Q000008:administration & dosage / Q000494:pharmacology*; D002540:Cerebral Cortex / Q000378:metabolism*; D007262:Infusions, Intravenous; D051381:Rats; D011919:Rats, Inbred Strains; D011943:Receptors, Adrenergic, beta / Q000187:drug effects*
chemical_list: D000928:Antidepressive Agents; D011943:Receptors, Adrenergic, beta