title: Absence of tissue-bound semicarbazide-sensitive amine oxidase activity in carp tissues.
abstract: We have previously reported that carp (Cyprinus carpio) tissue mitochondria contain a novel form of monoamine oxidase (MAO), which belongs neither to MAO-A nor to MAO-B of the mammalian enzyme. This conclusion results from the findings that the carp MAO was equally sensitive to a selective MAO-A inhibitor clorgyline and to the MAO-B selective inhibitor l-deprenyl, when tyramine, a substrate for both forms, serotonin or beta-phenylethylamine, a substrate for either A or B-form of mammalian MAO, was used. In the present study, we tried to detect another amine oxidase, termed tissue-bound semicarbazide-sensitive amine oxidase (SSAO), activity in carp tissues. As definition of SSAO was used, such as insensitivity to inhibition of the kynuramine oxidizing activity by an MAO inhibitor pargyline and high sensitivity to the SSAO inhibitor semicarbazide. The results indicated that the oxidizing activity was selectively and almost completely inhibited by 0.1 mM pargyline alone or a combination of 0.1 mM pargyline plus 0.1 mM semicarbazide, but not by 0.1 mM semicarbazide alone. We also tried to detect any SSAO activity by changing experimental conditions, such as lower incubation temperature, higher enzyme protein concentration, a lower substrate concentration and different pH's in the reaction, as the enzyme source. However, still no SSAO activity could be detected in the tissues. These results conclusively indicate that carp tissues so far examined do not contain SSAO activity.
authors.affiliation: Laboratory of Enzyme Pharmacology, Senshu University at Ishinomaki, Ishinomaki 986-8580, Japan.
authors.forename: Kazuya
authors.initials: K
authors.lastname: Takahashi
authors.forename: Izuru
authors.initials: I
authors.lastname: Kakuta
authors.forename: Haruyo
authors.initials: H
authors.lastname: Sugimoto
authors.forename: Toshio
authors.initials: T
authors.lastname: Obata
authors.forename: Lars
authors.initials: L
authors.lastname: Oreland
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Kinemuchi
mesh_terms: D006631:Amine Oxidase (Copper-Containing) / Q000378:metabolism*; D000818:Animals; D002347:Carps; D008928:Mitochondria / Q000201:enzymology*; D008995:Monoamine Oxidase / Q000378:metabolism*; D009928:Organ Specificity
chemical_list: D006631:Amine Oxidase (Copper-Containing); D008995:Monoamine Oxidase