Arteriosclerosis and Thrombosis, Vol 13, 1711-1717, Copyright © 1993 by American Heart Association

ARTICLES

Regulation of endothelial cell tissue factor expression by minimally oxidized LDL and lipopolysaccharide

H Fei, JA Berliner, F Parhami and TA Drake
Department of Pathology and Laboratory Medicine, UCLA School of Medicine 90024-1732.

Tissue factor (TF) is the predominant physiological initiator of coagulation, and its regulation is a critical aspect of endothelial cell hemostatic function. This report describes the regulation of TF mRNA expression by two physiological agonists: minimally oxidized low- density lipoprotein (MM-LDL), which may modulate endothelial hemostatic function in atherosclerosis, and lipopolysaccharide (LPS), which is a mediator of septic shock. Northern blot analysis of total RNA from human endothelial cells exposed to either MM-LDL or LPS for varying times showed that TF mRNA increased sharply at 1 hour, peaked at 2 to 3 hours, and declined to basal levels by 6 to 8 hours after treatment. The half-life of TF mRNA in MM-LDL- and LPS-exposed endothelial cells was approximately 45 minutes and 40 minutes, respectively. The rate of TF mRNA degradation was similar at 1 and 4 hours after exposure in either MM-LDL- or LPS-stimulated endothelial cells. Nuclear runoff transcription assays showed a significantly increased rate of TF gene transcription in both MM-LDL- and LPS-exposed endothelial cells. Cycloheximide inhibited the induction of TF protein activity, but it enhanced the accumulation of TF mRNA in MM-LDL- and LPS-induced endothelial cells. These results indicated that regulation of TF expression by MM-LDL and LPS in human endothelial cells occurs principally at the level of gene transcription.

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