Abstract
Tissue factor (TF) plays a central role during disseminated intravascular coagulation (DIC) in sepsis. We hypothesized that a frequent D/I polymorphism, at nucleotide position -1208 in the promoter region, could influence TF-mRNA and downstream coagulation. Basal- and lipopolysaccharide (LPS)-induced TF-mRNA expression, microparticle-associated TF-procoagulant activity and coagulation were determined in healthy men (n = 74) before and after endotoxin (LPS) infusion (2 ng kg(-1)). Basal values of TF-mRNA ranged between 34 and > 37.5 cycles. Baseline TF-mRNA levels significantly differed between genotypes: I/I carriers had almost 2-fold higher TF-mRNA levels compared to D/D carriers at baseline (P < 0.01). In accordance, higher levels of microparticle-associated TF-procoagulant activity could be seen in I/I carriers. However, the genotype did not affect basal or LPS-induced levels of prothrombin fragment F1+2, D-dimer or cytokines including tumor necrosis factor and interleukin-6. The TF-1208 polymorphism is functional in that it regulates basal TF-mRNA in circulating monocytes and circulating microparticle-associated TF-procoagulant activity in vivo, but does not influence the relative increase in TF-mRNA or coagulation activati...Continue Reading
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