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| Content Provider | PubMed Central |
|---|---|
| Author | Mann, C. D. Vu, T. B. Hrdina, P. D. |
| Abstract | 1. Recent evidence indicates that changes in the activity of cyclic AMP-dependent protein kinase may be involved in neuroadaptive mechanisms after chronic treatment with antidepressants. The aim of this study was to investigate the effect of repeated administration of fluoxetine (FL) and desipramine (DMI) on the distribution and activity of protein kinase C (PKC) in subcellular fractions of rat cortex (Cx) and hippocampus (Hc) under basal conditions and in response to a single in vivo administration of 5-HT2A/2C agonist, 1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane (DOI). 2. Rats were treated for 21 days with FL (5 mg kg-1 day-1, i.p.) or DMI (10 mg kg-1 day-1, i.p.). DOI was injected to groups of rats receiving repeated doses of antidepressants or to control rats 1 h before ex vivo PKC assay. Distribution of PKC was determined by [3H]-phorbol-12,13-dibutyrate ([3H]-PDBu) binding and PKC activity by the Amersham enzyme assay system. 3. Autoradiography of tissue sections revealed decreased [3H]-PDBu binding in CA1 region of hippocampus (by 18%) and paraventricular thalamic nucleus (by 28%) of rats after repeated administration of FL. 4. In vitro exposure of brain sections to 50 microM FL resulted in significant decreases (by 23-32%) of [3H]-PDBu binding in six out of seven regions examined; exposure to 100 microM FL reduced [3H]-PDBu binding (by 36-52%) in all regions. In contrast, exposure of brain sections to 100 microM DMI failed to alter specific [3H]-PDBu binding in brain sections.(ABSTRACT TRUNCATED AT 250 WORDS) |
| Starting Page | 595 |
| File Format | |
| ISSN | 00071188 |
| Journal | British Journal of Pharmacology |
| Issue Number | 4 |
| Volume Number | 115 |
| Language | English |
| Publisher Date | 1995-06-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Pharmacology |
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