HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Request Permissions Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Kamido, H. Articles by Kuksis, A. Search for Related Content PubMed PubMed Citation Articles by Kamido, H. Articles by Kuksis, A. Social Bookmarking                      What's this?

Journal of Lipid Research, Vol. 43, 158-166, January 2002
Copyright © 2002 by Lipid Research, Inc.

Core aldehydes of alkyl glycerophosphocholines in atheroma induce platelet aggregation and inhibit endothelium-dependent arterial relaxation

Correspondence to: Hiroshi Kamido, at Midori Health Care Foundation, 3-22-5 Tarumi-cho, Suita, Osaka 564-0062, Japan., hkamido-midori{at}umin.ac.jp (E-mail)

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.

Supplementary key words: acute coronary syndrome, glycerophosphocholine, lipid peroxidation, mass spectrometry, phospholipid, platelet-activating factor

CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this?

This article has been cited by other articles:

				A. A. Spector Plaque Rupture, Lysophosphatidic Acid, and Thrombosis Circulation, August 12, 2003; 108(6): 641 - 643. [Full Text] [PDF]

				E. Rother, R. Brandl, D. L. Baker, P. Goyal, H. Gebhard, G. Tigyi, and W. Siess Subtype-Selective Antagonists of Lysophosphatidic Acid Receptors Inhibit Platelet Activation Triggered by the Lipid Core of Atherosclerotic Plaques Circulation, August 12, 2003; 108(6): 741 - 747. [Abstract] [Full Text] [PDF]