Identification of active tissue factor in human coronary atheroma

Area of Science:

• Cardiovascular Biology
• Thrombosis Research
• Atherosclerosis Pathogenesis

Background:

• Thrombosis in vivo is increasingly linked to the tissue factor (TF) pathway.
• The TF activity within human coronary atheroma has remained largely unreported.

Purpose of the Study:

• To quantify tissue factor (TF) activity and expression in human coronary atheroma.
• To investigate the association between TF and thrombus formation in atherosclerotic lesions.
• To explore TF expression differences in de novo versus restenotic lesions.

Main Methods:

• Quantitative TF-specific activity assay on directional coronary atherectomy (DCA) specimens.
• Immunohistochemistry using a polyclonal anti-human TF antibody to detect TF antigen.
• Histological analysis to identify plaque thrombus and assess TF expression in de novo and restenotic lesions.

Main Results:

• Median TF content was 10 ng/g plaque, with detectable TF activity in 90% of lesions.
• TF antigen was found in 86% of lesions, present in both cellular and acellular plaque areas.
• Histologically defined thrombus was significantly associated with detectable TF antigen (19/43 lesions; P < .02).
• TF antigen was less frequently detected in restenotic lesions (31%) compared to de novo lesions (8%; P < .05).

Conclusions:

• TF contributes significantly to the procoagulant activity of atherosclerotic lesions.
• The presence of TF is linked to plaque thrombus, suggesting a role in coronary thrombosis.
• Reduced TF expression in restenotic lesions may explain lower complication rates, highlighting TF inhibition as a potential therapeutic strategy for preventing thrombotic complications during percutaneous coronary interventions.