title: Protein-bound 4-hydroxy-2-hexenal as a marker of oxidized n-3 polyunsaturated fatty acids.
abstract: In the present study, to investigate the contribution of n-3 PUFAs in the oxidative modification of protein in vivo, we characterize the covalent binding of 4-hydroxy-2-hexenal (HHE), a potent cytotoxic aldehyde originating from the peroxidation of n-3 PUFAs, to protein and describe the production of this aldehyde in oxidatively modified LDL and in human atherosclerotic lesions. Upon incubation with BSA, HHE was rapidly incorporated into the protein and generated the protein-linked carbonyl derivative, a potential marker of oxidatively modified proteins under oxidative stress. To detect the protein-bound HHE in vivo, we raised monoclonal antibody HHE53 (MAb HHE53) directed to the HHE-modified protein and identified the Michael addition-type HHE-histidine adduct as the major epitope. This antibody reacted with copper-oxidized LDL, suggesting that HHE was produced during the oxidative modification of LDL. In addition, we demonstrated that the materials immunoreactive to MAb HHE53 indeed constituted the atherosclerotic lesions, in which intense positivity was associated primarily with macrophage-derived foam cells. The results of this study suggest that the reaction between oxidized n-3 PUFAs and protein might represent a process common to the formation of degenerative proteins during aging and its related diseases.
authors.affiliation: Tsukuba Research Laboratory, NOF Corporation, Tsukuba 300-2635, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yamada
authors.forename: Tadashi
authors.initials: T
authors.lastname: Funada
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Shibata
authors.forename: Makio
authors.initials: M
authors.lastname: Kobayashi
authors.forename: Yoshichika
authors.initials: Y
authors.lastname: Kawai
authors.forename: Emi
authors.initials: E
authors.lastname: Tatsuda
authors.forename: Atsunori
authors.initials: A
authors.lastname: Furuhata
authors.forename: Koji
authors.initials: K
authors.lastname: Uchida
mesh_terms: D000447:Aldehydes / Q000032:analysis* / Q000276:immunology / Q000378:metabolism; D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis; D001011:Aorta / Q000473:pathology; D001161:Arteriosclerosis / Q000378:metabolism / Q000473:pathology; D015415:Biomarkers / Q000032:analysis; D015525:Fatty Acids, Omega-3 / Q000032:analysis / Q000378:metabolism*; D005260:Female; D006801:Humans; D015227:Lipid Peroxidation; D008077:Lipoproteins, LDL / Q000032:analysis / Q000276:immunology / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D010084:Oxidation-Reduction; D011506:Proteins / Q000032:analysis / Q000378:metabolism
chemical_list: D000447:Aldehydes; D000911:Antibodies, Monoclonal; D015415:Biomarkers; D015525:Fatty Acids, Omega-3; D008077:Lipoproteins, LDL; D011506:Proteins; C099252:oxidized low density lipoprotein; C045934:4-hydroxy-2-hexenal