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标题：Core aldehydes of alkyl glycerophosphocholines in atheroma induce platelet aggregation and inhibit endothelium-dependent arterial relaxation
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作者：Hiroshi Kamido ; Hiroyuki Eguchi ; Hisao Ikeda 等
期刊名称：JLR Papers In Press
印刷版ISSN：0022-2275
电子版ISSN：1539-7262
出版年度：2002
卷号：43
期号：1
页码：158-166
语种：English
出版社：American Society for Biochemistry and Molecular Biology
摘要：Plaque disruption with superimposed thrombosis is considered to be responsible for precipitating acute coronary syndrome. We identified sn -1-alkyl- and sn -1-acyl-type glycerophosphocholine (GroPCho) core aldehydes from human atheromas and demonstrated their activities on platelets and arteries. The naturally occurring core aldehydes were identified and quantified in relation to synthetic standards by high performance liquid chromatography with on-line electrospray mass spectrometry. 1- O -Hexadecyl-2-(5-oxovaleroyl)- sn -GroPCho (C₅ alkyl GroPCho core aldehyde), occurring in atheroma at less than 0.1% of total phosphatide, induced aggregation of washed rabbit platelets (50% effective dose was approximately 50 nM). Aggregations induced by C₅ alkyl GroPCho core aldehydes were completely inhibited by two different platelet-activating factor receptor antagonists. 1-Palmitoyl-2-(5-oxovaleroyl)- sn -GroPCho (C₅ acyl GroPCho core aldehyde) induced platelet shape change, but not aggregation. By contrast, 10 μM C₅ alkyl and C₅ acyl GroPCho core aldehydes both inhibited endothelium-dependent relaxation of rabbit artery by 50% (endothelium-independent relaxation was not affected). The present demonstration of platelet aggregation by physiologically relevant concentrations of alkyl GroPCho core aldehydes suggests that alkyl GroPCho core aldehyde generated in atheroma could be involved in precipitating acute coronary events, in which thrombus formation following lipid-rich plaque disruption plays an important role. —Kamido, H., H. Eguchi, H. Ikeda, T. Imaizumi, K. Yamana, K. Hartvigsen, A. Ravandi, and A. Kuksis. Core aldehydes of alkyl glycerophosphocholines in atheroma induce platelet aggregation and inhibit endothelium-dependent arterial relaxation. J. Lipid Res. 2002. 43: 158–166.
关键词：acute coronary syndrome ; glycerophosphocholine ; lipid peroxidation ; mass spectrometry ; phospholipid ; platelet-activating factor