Mouse models of thrombosis: thrombomodulin

Area of Science:

• Hematology
• Vascular Biology
• Genetics

Background:

• Thrombomodulin (TM) is crucial for the protein C anticoagulant pathway, regulating thrombin activity.
• TM also influences fibrinolytic and anti-inflammatory processes, independent of protein C and thrombin.
• Genetic modifications of the Thrombomodulin (Thbd) gene locus in mice allow for studying TM's distinct functions.

Purpose of the Study:

• To review animal models of TM-deficiency and their role in studying thrombosis.
• To analyze the pathological activation of the hemostatic mechanism in mice with altered TM function.
• To highlight novel, organ-specific functions of TM, particularly in the placental vasculature.

Main Methods:

• Utilizing genetically modified mouse strains with site-directed mutagenesis of the Thbd gene.
• Examining TM-deficiency models to induce thrombosis.
• Investigating the variability in thrombosis severity and phenotype based on genetic and environmental factors.

Main Results:

• TM-deficiency models exhibit variable thrombosis, influenced by secondary modifiers.
• Novel TM functions, especially in placental vascular beds, have been identified.
• These models replicate key aspects of human thrombophilia and thrombosis.

Conclusions:

• TM-deficiency mouse models are valuable for understanding thrombosis mechanisms.
• These models aid in validating current and developing new therapeutic concepts for human thrombotic disorders.
• TM plays critical roles beyond anticoagulation, including in placental development and vascular homeostasis.