Synergistic dopamine increase in the rat prefrontal cortex with the combination of quetiapine and fluvoxamine
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The combination of atypical antipsychotic drugs in addition to serotonin reuptake inhibitors has recently proven to be beneficial in a number of neuropsychiatric disorders, such as major depression, schizophrenia, and obsessive–compulsive disorder.
To investigate the effects of an atypical antipsychotic drug in combination with a serotonin reuptake inhibitor on extracellular serotonin [5-HT]ex, and dopamine levels [DA]ex in different brain areas.
The effects of quetiapine (10 mg/kg) with fluvoxamine (10 mg/kg) on [5-HT]ex and [DA]ex were compared in the rat dorsal striatum, prefrontal cortex, nucleus accumbens (core and shell), and thalamus by means of microdialysis coupled to HPLC with electrochemical detection.
Quetiapine had no significant effect on [DA]ex and [5-HT]ex levels in the prefrontal cortex and thalamus, but increased [DA]ex and [5-HT]ex levels in the dorsal striatum. In the accumbens, quetiapine increased [DA]ex levels and decreased [5-HT]ex levels. Fluvoxamine increased [5-HT]ex levels in all brain areas, and also increased [DA]ex levels in the striatum. The combination of quetiapine with fluvoxamine increased [DA]ex and [5-HT]ex levels in all brain areas compared with baseline. Although neither quetiapine nor fluvoxamine in monotherapy affected [DA]ex levels in the prefrontal cortex and thalamus, the combination produced a significant increase of [DA]ex levels in these two brain areas.
The combination of quetiapine with fluvoxamine causes a synergistic dopamine increase in the prefrontal cortex and the thalamus.
KeywordsDopamine Serotonin Microdialysis Schizophrenia Obsessive–compulsive disorder Pharmacotherapy
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