PMID- 11251341 OWN - NLM STAT- MEDLINE DCOM- 20010705 LR - 20171101 IS - 0301-0147 (Print) IS - 0301-0147 (Linking) VI - 30 Suppl 2 DP - 2000 TI - Physiological function of tissue factor pathway inhibitor and interaction with heparins. PG - 48-56 AB - Tissue factor pathway inhibitor (TFPI) is now recognized as a major physiological anticoagulant. Its main role is to modulate factor VIIa/tissue factor catalytic activity. Another important role is to potentiate the effect of heparins. TFPI is released from the vascular endothelium after injection of either unfractionated heparin (UFH) or low-molecular-weight heparins (LMWHs), which may then provide high concentrations of TFPI at sites of tissue damage and ongoing thrombosis. In dilute prothrombin-time-based assays, released TFPI contributes approximately one-third to the anticoagulant effect of heparin, the remaining being accounted for by antithrombin. Released TFPI, but not plasma TFPI, contains the basic carboxy-terminal tail which is important for the anticoagulant effect. UFH and LMWH exert differential effects on intravascular TFPI. UFH, but not LMWH, given in therapeutic doses, is associated with a progressive depletion of TFPI, which is associated with a strong rebound activation of coagulation after cessation of treatment. Such depletion may explain the apparent superior efficacy of LMWH observed in clinical trials. CI - Copyright 2001 S. Karger AG, Basel FAU - Sandset, P M AU - Sandset PM AD - Department of Haematology, Haematological Research Laboratory, Ullevaal University Hospital, Oslo, Norway. p.m.sandset@ioks.uio.no FAU - Bendz, B AU - Bendz B FAU - Hansen, J B AU - Hansen JB LA - eng PT - Journal Article PT - Review PL - Switzerland TA - Haemostasis JT - Haemostasis JID - 0371574 RN - 0 (Anticoagulants) RN - 0 (Antithrombins) RN - 0 (Factor Xa Inhibitors) RN - 0 (Glycosaminoglycans) RN - 0 (Heparin, Low-Molecular-Weight) RN - 0 (Lipoproteins) RN - 0 (lipoprotein-associated coagulation inhibitor) RN - 4C905MSK4W (Hexadimethrine Bromide) RN - 9005-49-6 (Heparin) SB - IM MH - Animals MH - Anticoagulants/chemistry/*metabolism MH - Antithrombins/physiology MH - Chemical Fractionation MH - Endothelium, Vascular/metabolism MH - Factor Xa Inhibitors MH - Glycosaminoglycans/pharmacology MH - Heparin/chemistry/*metabolism MH - Heparin, Low-Molecular-Weight/metabolism MH - Hexadimethrine Bromide/pharmacology MH - Humans MH - Lipoproteins/chemistry/*physiology MH - Models, Biological MH - Prothrombin Time MH - Structure-Activity Relationship RF - 66 EDAT- 2001/03/17 10:00 MHDA- 2001/07/06 10:01 CRDT- 2001/03/17 10:00 PHST- 2001/03/17 10:00 [pubmed] PHST- 2001/07/06 10:01 [medline] PHST- 2001/03/17 10:00 [entrez] AID - 54163 [pii] AID - 10.1159/000054163 [doi] PST - ppublish SO - Haemostasis. 2000;30 Suppl 2:48-56. doi: 10.1159/000054163.