Serotonin (5-hydroxytryptamine, 5HT) content and monoamine oxidase (MAO) activity were determined in whole blood of patients with Parkinson's disease (PD) with and without drug treatment and compared with controls. From that comparison a significant reduction in platelet 5HT became apparent in PD. Selegiline, which was always used in combination with L-dopa, not only inhibited MAO activity, as expected, but it also appeared to induce an increase in 5HT content.

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http://dx.doi.org/10.1016/0303-8467(95)00011-8DOI Listing

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