Identification and characterization of murine alternatively spliced tissue factor

Area of Science:

• Biochemistry
• Molecular Biology
• Hematology

Background:

• Tissue factor (TF) is a key initiator of coagulation, essential for hemostasis and thrombosis.
• A soluble form of human TF (asTF), generated by alternative splicing, lacks a transmembrane domain and is active on phospholipids.
• Mouse models are crucial for studying the roles of full-length TF (flTF) and asTF in thrombosis and injury.

Purpose of the Study:

• To identify and characterize murine soluble TF (masTF).
• To investigate the expression patterns of masTF and murine flTF (mflTF).
• To understand the contribution of masTF to total TF in physiological and pathological contexts.

Main Methods:

• Identification and characterization of murine asTF (masTF).
• Generation of antibodies specific for masTF and mflTF.
• Analysis of masTF and mflTF antigen expression in adult tissues, thrombi, and during development.

Main Results:

• Murine asTF (masTF) was identified and characterized, sharing features with human asTF, including a unique C-terminus and absence of a transmembrane domain.
• masTF antigen exhibits widespread and abundant expression in adult tissues, experimentally induced thrombi, and during development.
• The expression pattern of masTF is similar to that of mflTF.

Conclusions:

• masTF is a significant component of the total TF pool in mice.
• masTF likely plays a crucial role in mediating TF-dependent processes, including thrombosis and hemostasis.
• These findings highlight the importance of soluble TF variants in physiological regulation.