Abstract
The effect of some selective monoamine oxidase (MAO) inhibitors on aromatic L-amino acid decarboxylase (AADC) gene expression in PC12 cells has been examined. Irreversible MAO B inhibitors [(-)-deprenyl, pargyline, and MDL 72,974A] stimulated AADC gene expression, whereas a selective irreversible MAO A inhibitor (clorgyline) and a reversible MAO B inhibitor (Ro 19-6327) had no effect. Because there is no apparent MAO B activity in PC12 cells, it is postulated that there is a novel site of action for these MAO B inhibitors and that the pharmacological profile of this site matches that of neuroprotective MAO B inhibitors. Finally, it is suggested that the stimulation of AADC gene expression may be relevant to the antiparkinsonian effects of MAO B inhibitors.
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