Tissue factor/TFPI and blood cells.

Vascular injury-induced access of blood to tissue factor (TF) leads to the formation of a TF-FVII/FVIIa complex and the triggering of blood coagulation. The activated TF-dependent pathway is regulated by Tissue Factor Pathway Inhibitor (TFPI), which binds and inhibits FXa, but more importantly forms an inactive quaternary complex with TF-FVIIa-FXa, effectively shutting off the TF activity. The old view of TF residing in extravascular sites exclusively has recently been challenged by several reports on TF expression in various blood cells. The latter arena has unfortunately been marred by many contradictions, apparently related to inferior tools and/or study design, notably the widespread use of antibodies with inferior and misleading specificity and TF activity assays of low sensitivity/specificity. Our own studies along with many other reports, compels the conclusion that in blood of healthy individuals TF is exclusively associated with and expressed in circulating monocytes. In this short review the distribution of TF and TFPI in blood is discussed.

Abstract sourced from PubMed (NCBI) for the cited record. See the original publication for the authoritative version.

Vascular injury-induced access of blood to tissue factor (TF) leads to the formation of a TF-FVII/FVIIa complex and the triggering of blood coagulation. The activated TF-dependent pathway is regulated by Tissue Factor Pathway Inhibitor (TFPI), which binds and inhibits FXa, but more importantly...

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