The effect of short term administration of lithium on the hyperactivity induced by a mixture of d-amphetamine (DEX) and chlordiazepoxide (CDZP) have been examined in the rat and an attempt made to relate this action to changes in brain concentrations of 5-hydroxytryptamine (5-HT) and 5-hydroxyindoleacetic acid (5-HIAA). The DEX-CDZP mixture caused a large increase in Y-maze entries (P<0.001). Lithium (2 or 4 mEq/kg) attenuated the increase in entries (P<0.001) and activity cage locomotion (P<0.01) without significantly affecting these parameters in saline-treated rats. However, the increased 5-HT concentration (P<0.05) found in the midbrain after the DEX-CDZP mixture was not modified by prior administration of lithium. In control rats lithium had no effect on the level of 5-HT in the cerebellum, cerebral cortex, midbrain or striatum. Levels of 5-hydroxyindoleacetic acid (5-HIAA) in all four brain regions were unaffected by both the DEX-CDZP mixture or pretreatment with lithium. The possible action of the DEX-CDZP mixture on central 5-HT systems and the suitability of the hyperactivity induced by the drug mixture as a model for mania is discussed.
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A. L. Vale
Present address: Department of Pharmacology and Clinical Pharmacology, The Medical School, Ninewells Hospital, DD1 9SY, DUNDEE, GB
Department of Pharmacology, School of Pharmacy, Brighton Polytechnic, BN2 4GL, Brighton, GB
A. L. Vale & F. Ratcliffe
Vale, A.L., Ratcliffe, F. Effect of lithium administration on rat brain 5-hydroxyindole levels in a possible animal model for mania. Psychopharmacology 91, 352–355 (1987). https://doi.org/10.1007/BF00518190
Received: 10 October 1986
Issue Date: September 1987
DOI: https://doi.org/10.1007/BF00518190
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