Abstract:
:N(ε)-(Hexanoyl)lysine, formed by the reaction of lysine with n-6 lipid hydroperoxide, is a lipid peroxidation marker during the initial stage of oxidative stress. The aim of the present study is to indentify N(ε)-(hexanoyl)lysine-modified proteins in neoplastic transformed gastric mucosal cells by N-methyl-N'-nitro-N-nitrosoguanidine, and to compare the levels of these proteins between gastric mucosal cells and normal gastric cells. Much greater fluorescence of 2-[6-(4'-hydroxy)phenoxyl-3H-xanthen-3-on-9-yl]benzoic acid, an index of the intracellular levels of reactive oxygen species, was observed for gastric mucosal cells compared to normal gastric cells. N(ε)-(Hexanoyl)lysine-modified proteins were detected by SDS-PAGE or two-dimensional electrophoresis and Western blotting using anti-N(ε)-(hexanoyl)lysine polyclonal antibody, and a protein band of between 30-40 kDa was clearly increased in gastric mucosal cells compared to normal gastric cells. Two N(ε)-(hexanoyl)lysine-modified protein spots in gastric mucosal cells were identified as the tropomyosin 1 protein by mass spectrometry using a MASCOT search. The existence of N(ε)-(hexanoyl)lysine modification in tropomyosin 1 was confirmed by Western blotting of SDS-PAGE-separated or two-dimensional electrophoresis-separated proteins as well as by the immunoprecipitation with anti-tropomyosin 1 antibody. These data indicate that N(ε)-(hexanoyl)lysine modification of tropomyosin 1 may be related to neoplastic transformation by N-methyl-N'-nitro-N-nitrosoguanidine in gastric epithelial cells.
journal_name
J Clin Biochem Nutrjournal_title
Journal of clinical biochemistry and nutritionauthors
Okada H,Naito Y,Takagi T,Takaoka M,Oya-Ito T,Fukumoto K,Uchiyama K,Handa O,Kokura S,Nagano Y,Matsui H,Kato Y,Osawa T,Yoshikawa Tdoi
10.3164/jcbn.11-39subject
Has Abstractpub_date
2012-01-01 00:00:00pages
47-52issue
1eissn
0912-0009issn
1880-5086pii
jcbn11-39journal_volume
50pub_type
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