Biogenic amines and narcotic effects. II. Serotonin turnover in the rat after acute and chronic morphine administration.
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Biomedical subjects
Publications and source records attributed to E Sanders-Bush.
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In contrast to the pronounced fall in 5HT levels and synaptosomal uptake caused by p-chloroamphetamine, bilateral lesions of the B-9 cell group caused minimal regional changes, except for 35% decreases in the metathalamus-thalamus. We conclude therefore that the prolonged biochemical effects of p-chloroamphetamine are not due to a selective cytotoxic action on B-9 cells; and that a lateral 5HT pathway, possibly from the B-9 cell group, projects to the metathalamus-thalamus.
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Central 5-HT2 and 5-HT1C receptors appear to be relatively resistant to up-regulation. 5-HT2 receptors are not upregulated after denervation of 5-HT neurons and chronic administration of antagonists elicits a paradoxical downregulation of both receptors. This article explores the possible explanations for these anomalous findings.