Characterization of the in vitro binding and inhibition kinetics of primary amine oxidase/vascular adhesion protein-1 by glucosamine |
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Authors: | Aldo Olivieri Keith F. Tipton Jeff O'Sullivan |
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Affiliation: | 1. School of Biochemistry and Immunology, Trinity College Dublin, Ireland;2. Dublin Dental School and Hospital, Trinity College, Dublin 2, Ireland |
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Abstract: | BackgroundPrimary-amine oxidase (PrAO) catalyzes the oxidative deamination of endogenous and exogenous primary amines and also functions, in some tissues, as an inflammation-inducible endothelial factor, known as vascular adhesion protein-1. VAP-1 mediates the slow rolling and adhesion of lymphocytes to endothelial cells in a number of inflammatory conditions, including inflammation of the synovium.MethodsGlucosamine binding to the enzyme was assessed spectrofluorometrically and the kinetics of inhibition of PrAO were determined spectrophotometrically through the use of direct or coupled assays, in the presence of different substrates.ResultsGlucosamine is not a substrate for PrAO, but acts as a time-dependent inhibitor of PrAO activity, displaying mixed inhibition kinetics. The observed inhibition and binding were augmented in the presence of H2O2.ConclusionsSignificant in vitro effects on PrAO require glucosamine in the millimolar concentration range and it is not clear at this stage whether a low but persistent level of PrAO inhibition might contribute to the anti-arthritic response.General significanceThis work was aimed at characterizing the interactions of PrAO/VAP-1 with glucosamine, a widely used “over-the-counter” supplement for the treatment of osteoarthritis. |
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Keywords: | PrAO, primary amine oxidase SSAO, semicarbazide-sensitive amine oxidase VAP, vascular adhesion protein |
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