Abstract
The expression of the two isoforms of monoamine oxidase (MAO A and MAO B) is often inferred from proxy measures such as mRNA transcript levels or catalytic activity. Yet the literature is clear that the proportionality of protein, mRNA, and activity does not guarantee that any of these measures can be used as a proxy for any of the others. Here we provide a protocol for the detection of MAO proteins in cell lysates that can be adapted readily to tissue preparations. Given that MAOs influence many physiological and pathological processes, we feel it is essential to include measures of protein expression when exploring genetic regulation or catalytic properties of these important enzymes.
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