Abstract
The effect of antiepileptic drug di-n-propylacetamide (DPM) on 5-hydroxytryptamine (5-HT) turnover in rat brain and 5-hydroxyindoleacetic acid (5-HIAA) in cat cerebrospinal fluid (CSF) was investigated. DPM (200 mg/kg) increased brain 5-HIAA without altering the 5-HT level. DPM augmented the accumulation of 5-HT induced by monoamine oxidase inhibition with pargyline (80 mg/kg) and enhanced the accumulation of 5-HIAA in the brain following blockade of transport of this metabolite by probenecid (200 mg/kg). Prior inhibition of 5-HT synthesis by p-chlorophenylalanine (300 mg/kg) abolished the DPM-induced increase in cerebral 5-HIAA. DPM (100 mg/kg) given daily for 5 days considerably elevated 5-HIAA in the CSF of cat during the treatment period. We conclude that DPM increases the turnover of 5-HT in brain and that this can be observed by monitoring the 5-HIAA content of CSF.
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