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Gene targeting in hemostasis. tissue factor pathway inhibitor
1251 Nieuwland Science Hall, W.M. Keck Center for Transgene Research and the Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, USA. chan.8@nd.edu
Frontiers in Bioscience : a Journal and Virtual Library
|February 15, 2001
Summary
Tissue Factor Pathway Inhibitor (TFPI) is crucial for embryonic development. Its absence causes early mortality in mice, which can be rescued by reducing Factor VII (FVII) activity.
Area of Science:
- Biochemistry
- Developmental Biology
- Hematology
Background:
- Tissue Factor Pathway Inhibitor (TFPI) regulates the extrinsic coagulation cascade.
- The Kunitz-1 domain of TFPI is essential for its inhibitory function.
- TFPI deficiency leads to embryonic lethality in mice.
Purpose of the Study:
- To investigate the role of TFPI in embryonic development.
- To determine the consequences of TFPI Kunitz-1 domain deletion.
- To explore the interaction between TFPI and Factor VII (FVII) in embryogenesis.
Main Methods:
- Generation of TFPI Kunitz-1 domain deleted mutant mice (TFPIKu1delta/delta).
- Analysis of embryonic lethality and developmental timing.
- Crossbreeding TFPI mutant mice with FVII deficient mice (heterozygous and homozygous).
Main Results:
- TFPIKu1delta/delta mice exhibit embryonic lethality between E9.5dpc and birth.
- Co-inheritance of FVII deficiency (heterozygous or homozygous) rescues the embryonic lethality in TFPI mutant mice.
- Reduced FVII activity ameliorates the requirement for TFPI during embryogenesis.
Conclusions:
- The TFPI Kunitz-1 domain is essential for embryonic survival.
- The FVIIa/TF clotting pathway is critical during embryogenesis and requires TFPI for regulation.
- Modulating FVII activity can compensate for the lack of TFPI function during development.