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  • Title: The current status of monoamine oxidase and its inhibitors.
    Author: Jarrott B, Vajda FJ.
    Journal: Med J Aust; 1987 Jun 15; 146(12):634-8. PubMed ID: 3114597.
    Abstract:
    The enzyme monoamine oxidase (MAO) plays an important role in the inactivation of both dietary amines and also of neurotransmitter amines. A study of the properties of irreversible inhibitors of this enzyme suggests that the enzyme exists in two broad types--MAO-A and MAO-B. Although irreversible inhibitors of MAO were once widely used as antidepressant agents, they fell from favour because of adverse reactions after the ingestion of amine-containing foodstuffs ("the cheese reaction"). However, these inhibitors (phenelzine and tranylcypromine) are probably best for the treatment of atypical depression providing the patient is aware of dietary reactions. A new series of reversible, MAO-A selective inhibitors are being developed which do not exhibit serious dietary interactions. These reversible inhibitors show promise as rapidly acting antidepressant agents. An atypical irreversible MAO-B selective inhibitor, selegiline (deprenyl) does not exhibit an adverse reaction on the ingestion of amine-containing foods. This drug has been used as an adjuvant in the treatment of Parkinson's disease since it allows the dose of L-dopa to be reduced by approximately 25%. More important, selegiline may slow the degeneration of dopaminergic neurons that is characteristic of Parkinson's disease.
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