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Abstract
1. It has previously been established that monoamine oxidase (MAO)-B participates in the metabolism of milacemide [2-(pentylamino)acetamide]. Furthermore, in rats, inhibition of FAD-dependent polyamine oxidase (PAO) was found to decrease the urinary excretion of two milacemide metabolites, termed UK1 and UK2.
2. Using gas chromatography—mass spectrometry, UK1 was identified as oxamic acid and UK2 as 2-hydroxyacetamide, confirming that PAO is involved in the metabolism of milacemide.
3. Thus, two FAD-dependent amine-oxidizing enzymes, MAO and PAO, contribute to the metabolism of milacemide. Milacemide appears to be the first non-polyamine xenobiotic in the metabolism of which PAO participates.