Thomas Müller1, Peter Riederer, Edna Grünblatt. 1. *Department of Neurology, St Joseph Hospital Berlin-Weißensee, Berlin; and †Department of Psychiatry, Psychosomatics and Psychotherapy, Center of Mental Health, University Hospital Würzburg, Würzburg, Germany; and ‡Department of Child and Adolescent Psychiatry and Psychotherapy, Psychiatric Hospital, University of Zurich, Schlieren; §Neuroscience Center Zurich, University of Zurich and ETH Zurich, Zurich; and ∥Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland.
Abstract
BACKGROUND: Biogenic amines and monoamine oxidase inhibitors influence peripheral monoamine oxidase enzyme activity in chronic levodopa/dopa decarboxylase inhibitor-treated patients with Parkinson disease. Rasagiline is an irreversible inhibitor of monoamine oxidase B. Safinamide blocks this isoenzyme in a reversible fashion. OBJECTIVES: The aim of this study was to determine monoamine oxidase A (plasma) and B (platelets) enzyme activity in long-term levodopa-treated patients without and with additional oral intake of 50- or 100-mg safinamide or 1-mg rasagiline or first-time intake of rasagiline. RESULTS: Monoamine oxidase A enzyme activity did not differ between all groups. Patients on rasagiline or safinamide showed lower monoamine oxidase-B enzyme activity compared with patients without monoamine oxidase B inhibitor intake. No impact of the number of previous oral levodopa intakes was found. DISCUSSION: Rasagiline and safinamide did not essentially differ in terms of inhibition of monoamine oxidase B despite their different pharmacology regarding reversibility of monoamine oxidase B inhibition. In view of the observed, considerable heterogeneity of enzyme activities, we suggest to determine activities of monoamine oxidase A and B to reduce the risk for tyramine-induced hypertension and the serotonergic syndrome during chronic therapy with rasagiline or safinamide.
BACKGROUND: Biogenic amines and monoamine oxidase inhibitors influence peripheral monoamine oxidase enzyme activity in chronic levodopa/dopa decarboxylase inhibitor-treated patients with Parkinson disease. Rasagiline is an irreversible inhibitor of monoamine oxidase B. Safinamide blocks this isoenzyme in a reversible fashion. OBJECTIVES: The aim of this study was to determine monoamine oxidase A (plasma) and B (platelets) enzyme activity in long-term levodopa-treated patients without and with additional oral intake of 50- or 100-mg safinamide or 1-mg rasagiline or first-time intake of rasagiline. RESULTS:Monoamine oxidase A enzyme activity did not differ between all groups. Patients on rasagiline or safinamide showed lower monoamine oxidase-B enzyme activity compared with patients without monoamine oxidase B inhibitor intake. No impact of the number of previous oral levodopa intakes was found. DISCUSSION: Rasagiline and safinamide did not essentially differ in terms of inhibition of monoamine oxidase B despite their different pharmacology regarding reversibility of monoamine oxidase B inhibition. In view of the observed, considerable heterogeneity of enzyme activities, we suggest to determine activities of monoamine oxidase A and B to reduce the risk for tyramine-induced hypertension and the serotonergic syndrome during chronic therapy with rasagiline or safinamide.
Authors: Palanisamy Sivanandy; Tan Choo Leey; Tan Chi Xiang; Tan Chi Ling; Sean Ang Wey Han; Samantha Lia Anak Semilan; Phoon Kok Hong Journal: Int J Environ Res Public Health Date: 2021-12-30 Impact factor: 3.390