Synthesis and turnover of 3H-5-hydroxytryptamine in the later cerebroventricle

The lateral cerebroventricle was perfused using two different labelling procedures in three separate experiments on 5-hydroxytryptamine metabolism. The sensitivity of 5-hydroxytryptamine metabolism to various drugs was subsequently determined. The results demonstrate that two serotonin reuptake blockers, imipramine and fluoxetine, increase the efflux of 3h-5-hydroxytryptamine into the ventricle without affecting the efflux of 3H-5-hydroxyindoleacetic acid. BL-3912 A, a drug with weak serotonin agonist activity, also increased the efflux of 3H-5-hydroxytryptamine into the ventricle.