Unaltered 5-HT- and desipramine-sensitive [3H]imipramine binding and [3H]5-HT uptake in rat brain after chronic imipramine and norzimeldine treatment |
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Authors: | Jan Marcusson Inger T Bäckström Svante B Ross |
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Institution: | (1) Department of Geriatric Medicine, University of Ume», S901 87 Ume», Sweden;(2) Department of Pathology, University of Ume», S-901 87 Ume», Sweden;(3) Department of Pharmacology, Research and Developmental Laboratories, Astra Alab AB, S-151 85 Södertälje, Sweden |
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Abstract: | Several reports have shown heterogeneity of 3H]imipramine binding to brain membranes. Recently, a high affinity and 5-HT sensitive 3H]imipramine binding site of protein nature, that was suggested to be identical to the substrate recognition site for 5-HT uptake, was demonstrated. Since most studies on the regulation of the 3H]imipramine binding sites by antidepressants have used desipramine displaceable binding, which is heterogenous in nature and contains binding not related to 5-HT uptake sites, the present report studies the possible effects of chronic (3 weeks) administration of imipramine or norzimeldine (10 mg/kg intraperitoneally twice daily) on 5-HT sensitive 3H]imipramine binding sites. For comparison, desipramine sensitive binding was also studied, as well as the physiological correlate 5-HT uptake. There were no changes in either 3H]imipramine binding or 5-HT uptake after the antidepressant treatment.Supported by the Swedish Medical Research Council
Offprint requests to: J. Marcusson at Dept. of Geriatric Medicine |
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Keywords: | 5-HT sensitive [3H]imipramine 5-HT uptake Chronic antidepressant treatment |
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