title: Protection by carnosine-related dipeptides against hydrogen peroxide-mediated ceruloplasmin modification.
abstract: Carnosine, homocarnosine, and anserine are present in high concentrations in the muscle and brain of many animals and humans. Previous studies showed that these compounds have an antioxidant function. We investigated the protective effects of carnosine and related compounds on the modification of human ceruloplasmin that is induced by H2O2. Carnosine, homocarnosine, and anserine significantly inhibited the fragmentation and inactivation of ceruloplasmin that is induced by H2O2. All three compounds also inhibited the release of copper ion from protein, and the formation of hydroxyl radicals in the ceruloplasmin/H2O2 system. These compounds inhibited the fragmentation of human serum albumin that is induced by the copper-catalyzed oxidation system, as well as by the iron-catalyzed oxidation system. These results suggest that carnosine, homocarnosine, and anserine might protect ceruloplasmin against H2O2-mediated oxidative damage through a combination of copper chelation and free radical scavenging.
authors.affiliation: Department of Genetic Engineering, Chongju University, Korea. jhkang@chongju.ac.kr
authors.forename: Jung Hoon
authors.initials: JH
authors.lastname: Kang
authors.forename: Kyung Sik
authors.initials: KS
authors.lastname: Kim
authors.forename: Soo Young
authors.initials: SY
authors.lastname: Choi
authors.forename: Hyeok Yil
authors.initials: HY
authors.lastname: Kwon
authors.forename: Moo Ho
authors.initials: MH
authors.lastname: Won
authors.forename: Tae-Cheon
authors.initials: TC
authors.lastname: Kang
mesh_terms: D000818:Animals; D000861:Anserine / Q000494:pharmacology; D000975:Antioxidants / Q000494:pharmacology; D002336:Carnosine / Q000031:analogs & derivatives* / Q000494:pharmacology*; D002570:Ceruloplasmin / Q000737:chemistry / Q000187:drug effects* / Q000378:metabolism*; D003300:Copper / Q000378:metabolism; D006801:Humans; D006861:Hydrogen Peroxide / Q000633:toxicity*; D017665:Hydroxyl Radical / Q000378:metabolism; D066298:In Vitro Techniques; D010084:Oxidation-Reduction; D010446:Peptide Fragments / Q000737:chemistry / Q000378:metabolism
chemical_list: D000975:Antioxidants; D010446:Peptide Fragments; D017665:Hydroxyl Radical; C005038:homocarnosine; D003300:Copper; D002336:Carnosine; D006861:Hydrogen Peroxide; D002570:Ceruloplasmin; D000861:Anserine