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| | Inhibition Assay |
| Description: | The inhibitory activity of monoamine oxidases A and B was assessed by the Fowler and Tipton radiometric method (Biochem Pharmacol 1981, 30, 3329) using a purification of rat liver mitochondria as the source of enzymes. The inhibitory activity of MAO-B was compared to 25 ul of [14C]-phenylethylamine (PEA), 20 uM of activity, 2.5 mCi/mmol. The inhibitory activity of MAO-A was compared to 25 ul of [14C]-(5-hydroxytriptamine) (5-HT), 100 uM of activity, 0.5 mCi/mmol. Inhibition curves were performed in triplicate by incubating at least nine inhibitor concentrations for 30 min. A triplicate sample without inhibitor was always present so as to be aware of 100% of the MAO activity. The reaction took place with the addition of the substrate in a final volume of 225 ul of 50 mM phosphate buffer, pH 7.4, containing 20 ul of rat liver mitochondria at a concentration of 5 mg/ml. The reaction was carried out under continuous stirring at 37 C. for 4 minutes. |
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