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Papers In Press, published online ahead of print July 1, 2006
J. Lipid Res., doi:10.1194/jlr.M600091-JLR200

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Journal of Lipid Research, Vol. 47, 1386-1398, July 2006
Copyright © 2006 by American Society for Biochemistry and Molecular Biology

Formation of N-(succinyl)lysine in vivo: a novel marker for docosahexaenoic acid-derived protein modification

Yoshichika Kawai^1,2, Hiroyuki Fujii, Miki Okada, Yoshikazu Tsuchie, Koji Uchida and Toshihiko Osawa

Laboratory of Food and Biodynamics, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan

Published, JLR Papers in Press, April 1, 2006.

² Present address of Y. Kawai: Department of Food Science, Graduate School of Nutrition and Biosciences, The University of Tokushima, Tokushima 770-8503, Japan.

¹ To whom correspondence should be addressed. e-mail: y-kawai{at}nutr.med.tokushima-u.ac.jp

Free radical-catalyzed peroxidation of docosahexaenoic acid (DHA, C22:6/-3) generates various lipid peroxidation products that covalently modify biomolecules such as proteins. Under a free radical-generating system, DHA significantly modified lysine residues in bovine serum albumin. Upon incubation of oxidized DHA with an amino-compound pyridoxamine or a lysine-containing peptide, N-propanoyl and N-succinyl adducts were determined to be the major modification products. The hydroperoxide levels in the oxidized DHA closely reflected the formation of the N-(succinyl)lysine (SUL) upon reaction with the peptide, indicating that the hydroperoxides of DHA represent a potential pathway for the formation of SUL. To detect the DHA-derived protein modification in vivo, we developed a monoclonal antibody (mAb2B12) specific to SUL and found that the antibody specifically reacts with the SUL moiety. The formation of SUL was then immunochemically demonstrated in the liver of mice fed with DHA followed by intraperitoneal injection of carbon tetrachloride (CCl₄), a hepatic lipid peroxidation model. Immunoreactive materials with mAb2B12 were observed in the DHA + CCl₄ group, but were not significant in the control, DHA-alone, and CCl₄-alone groups. These data suggest that the formation of DHA-derived adducts such as SUL may be implicated in the oxidative damage observed in DHA-enriched tissues.

Supplementary key words oxidative stress • lipid hydroperoxides • monoclonal antibody • immunohistochemistry

Abbreviations: BGL, N-benzoyl-glycyl-L-lysine; CID, collision-induced dissociation; DHA, docosahexaenoic acid; EDC, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide; HNE, 4-hydroxy-2-nonenal; KLH, keyhole limpet hemocyanin; LC-MS, liquid chromatography-mass spectrometry; MDA, malondialdehyde; PI, peroxidizability index; PM, pyridoxamine; SUL, N-(succinyl)lysine; sulfo-NHS, N-hydroxysulfosuccinimide; TBARS, thiobarbituric acid-reactive substances

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