The missing link between atherosclerosis, inflammation and thrombosis: is it tissue factor?

Area of Science:

• Cardiovascular Biology
• Hemostasis and Thrombosis
• Molecular Medicine

Background:

• Acute coronary syndromes involve thrombus formation on disrupted atherosclerotic plaques.
• Tissue factor (TF) within lesions and circulating in blood (blood-borne TF) are key prothrombotic factors.
• Blood-borne TF exists in various forms, including cell-associated and soluble pools, and can be activated.

Purpose of the Study:

• To explore the role of blood-borne TF in acute coronary syndromes.
• To understand the concept of 'vulnerable blood' characterized by increased TF activity.
• To investigate the link between pathological conditions, TF activity, and thrombotic risk.

Main Methods:

• Review of recent studies on TF pools and activity.
• Analysis of TF's role in hypercoagulable states.
• Examination of TF's interaction with inflammation and signaling pathways.

Main Results:

• Blood-borne TF, beyond vessel-wall TF, significantly impacts thrombosis.
• Conditions like smoking, hyperlipidemia, and diabetes are associated with elevated circulating TF activity.
• Increased TF activity may worsen acute coronary syndromes by potentiating thrombus formation.
• TF has complex roles, including signaling receptor functions, beyond coagulation.

Conclusions:

• Blood-borne TF is a critical determinant in acute coronary syndromes.
• Elevated circulating TF activity defines a 'vulnerable blood' state, increasing thrombotic risk.
• TF's pro-inflammatory and signaling roles highlight its complex contribution to cardiovascular disease.