Independent effects of cholinergic and serotonergic lesions on acetylcholine and serotonin release in the neocortex of the rat |
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Authors: | Ad J Dekker Leon J Thal |
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Institution: | (1) Department of Neurosciences, University of California and Neurology Service, VA Medical Center, 3350 La Jolla Village Drive, 92161 San Diego, CA |
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Abstract: | Rats received a unilateral lesion of the nucleus basalis magnocellularis (NBM) by infusion of ibotenic acid. In addition, the dorsal raphe nucleus was lesioned by infusion of 5,7-dihydroxytryptamine (5,7-DHT). The release of acetylcholine (ACh), choline, serotonin (5-HT) and 5-hydroxyindoleacetic acid (5-HIAA) was measured in the frontal neocortex by means of microdialysis. Lesions of the NBM, but not the raphe nucleus, reduced the release of ACh significantly (–47%). The release of 5-HT and 5-HIAA was reduced by raphe lesions (–44% and –79%), but not by NBM lesions. In no case did the combined lesion affect neurotransmitter release more than a single lesion. These results suggest that serotonergic projections from the dorsal raphe nucleus are not involved in tonic inhibition of ACh release in the neocortex. |
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Keywords: | Acetylcholine serotonin microdialysis frontal cortex nucleus basalis magnocellularis dorsal raphe nucleus |
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