Acute and Chronic Effects of Desipramine and Clorgyline on Alpha(2)-adrenoceptors Regulating Noradrenergic Transmission in the Rat Brain: a Dual-probe Microdialysis Study

Overview

Journal Br J Pharmacol

Publisher Wiley

Specialty Pharmacology

Date 2001 Aug 11

PMID 11498523

Citations 22

Authors

Y Mateo

J J Meana

Affiliations

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Abstract

1. The effects of desipramine (3 mg kg(-1) i.p.) and clorgyline (1 mg kg(-1) i.p.) on extracellular noradrenaline (NA) in the locus coeruleus (LC) and cingulate cortex were assessed in freely-moving rats by dual-probe microdialysis. Functional activities of alpha(2)-adrenoceptors regulating NA release in the LC and cingulate cortex were determined by systemic (0.3 mg kg(-1) i.p.) or local (0.1 - 100 microM) clonidine administration. 2. Extracellular NA was increased in the LC and cingulate cortex following acute desipramine but not clorgyline treatment. Systemic clonidine decreased NA similarly in desipramine-, clorgyline-, and saline-treated animals, in both brain areas. 3. Long-term (twice daily, 14 days) but not short-term (twice daily, 7 days) desipramine, and long-term clorgyline (once daily, 21 days) treatments increased NA (3 fold) in cingulate cortex but not in the LC. Following long-term treatments, responses of NA to systemic clonidine were attenuated in the LC and cingulate cortex. 4. Clonidine perfusion by reverse dialysis into the cingulate cortex decreased local NA (-55 +/- 9%). The effect was attenuated by long-term desipramine (-31 +/- 9%) and clorgyline (-10 +/- 2%) treatments. 5. Clonidine perfusion by reverse dialysis into the LC decreased NA in the LC (-89 +/- 2%) and in cingulate cortex (-52 +/- 12%). This effect was attenuated in the LC following long-term desipramine (-72 +/- 4%) and clorgyline (-62 +/- 12%) treatments but it was not modified in the cingulate cortex (-57 +/- 10% and -68 +/- 6%, respectively). 6. These findings demonstrate that chronic desipramine or clorgyline treatments increase NA in noradrenergic terminal areas and desensitize alpha(2)-adrenoceptors modulating local NA release at somatodendritic and terminal levels. However, somatodendritic alpha(2)-adrenoceptors that control LC firing activity are not desensitized.

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