Background: TFPI-2 inhibits plasma kallikrein, FXIa, and plasmin, but its concentration in normal plasma is insufficient to inhibit clotting or fibrinolysis. Results: Platelets contain TFPI-2 derived from megakaryocytes and binds to platelet FV/Va and circulating FV in late pregnancy when plasma TFPI-2 is ϳ7 nM. Conclusion: Platelet-derived TFPI-2 regulates intrinsic coagulation and tPA-induced fibrinolysis. Significance: Platelet-derived TFPI-2 promotes clot stabilization while attenuating intrinsic clotting.
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