New glycosidic derivatives of histidine-containing dipeptides with antioxidant properties and resistant to carnosinase activity(649 views) Bellia F, Amorini AM, La Mendola D, Vecchio G, Tavazzi B, Giardina B, Di Pietro V, Lazzarino G, Rizzarelli E
Department of Chemical Sciences, University of Catania, Viale A. Doria 6, 95125 Catania, Italy.
CNR Institute of Biostructure and Bioimaging, Viale A. Doria 6, 95125 Catania, Italy
Institute of Biochemistry and Clinical Biochemistry, Catholic University of Rome, Largo F. Vito 1, 00164 Rome, Italy
References: Not available.
New glycosidic derivatives of histidine-containing dipeptides with antioxidant properties and resistant to carnosinase activity
Synthesis, antioxidant properties and resistance to carnosinase hydrolysis of histidine-containing dipeptides are reported in this study. Carnosine (beta-alanyl-l-histidine), homocarnosine (gamma-aminobutyryl-l-histidine) and anserine (beta-alanyl-3-methyl-l-histidine) were covalently derivatized with beta-cyclodextrin to form different OH- or NH-bound conjugates. Mass spectroscopic and (1)H NMR data were used to determine the structure and the purity of the various beta-cyclodextrin derivatives. The inhibitory effect towards oxidation of human LDL induced by Cu(2+) ions, was estimated by measuring malondialdehyde formation as a function of increasing concentrations of these newly synthesized compounds (the beta-cyclodextrin-anserine conjugated in 3 had the highest antioxidant effect). All derivatives had higher antioxidant effects than those of the corresponding free histidine-containing dipeptides. Resistance to rat brain carnosinase hydrolysis of the most active derivatives indicated that these compounds are good candidates for further studies in more complex cellular and animal models. Their possible applications for remedies in neurodegenerative disorders, such as Alzheimer's and Parkinson's diseases, are discussed.
New glycosidic derivatives of histidine-containing dipeptides with antioxidant properties and resistant to carnosinase activity