Abstract
beta-Phenylethylamine (PEA) was characterized as a substrate for type A and type B monoamine oxidase (MAO) in brain and liver mitochondria of eight species at different substrate concentrations. In all species, at 10.0 microM, PEA was almost specific for type B MAO. At 1000 microM, however, the amine was common for both types of MAO in rat brain and liver, human brain and liver, mouse brain, guinea pig brain and liver, and bovine brain, while it was specific for type B MAO in mouse liver, rabbit brain and liver, bovine liver, pig brain and liver, and chicken brain and liver. From the present study, when PEA is used as a type B substrate, it is recommended that the substrate concentration should be sufficiently low to avoid the effects of species and tissue differences.
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