Platelet Adhesion to Subendothelial Structures under Flow Conditions: No Effect of the Lipoxygenase Product 13-HODE

Summary

It has been shown that endothelial cells can convert linoleic acid to 13-hydroxyoctadecadienoic acid (13-HODE) and it has been suggested that 13-HODE has non-thrombogenic properties. However, no direct evidence has been presented that indicates that 13-HODE indeed modulates platelet-vessel wall interaction.

In this study we have bound a purified 13-HODE to a thrombogenic surface and its effect on platelet adhesion was studied and compared to the effects of an analogous hydroxy fatty acid, 15-hydroxyeicosatetraenoic acid (15-HETE). The effect of 13-HODE on platelet adhesion was studied both under static and flow conditions. In this report we show that binding of up to 40 times the physiological concentration to a thrombogenic surface has no inhibitory effect on platelet adhesion under static or flow conditions. We conclude that 13-HODE is not an important regulatory substance in platelet-subendothelium interaction, although this does not exclude it has a putative anti-adhesive role on intact endothelium.

Keywords

13-HODE - Platelet adhesion - Subendothelium - Endothelial cells

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