The effect of cigarette smoke extract on thrombomodulin-thrombin binding: an atomic force microscopy study

Area of Science:

• Cardiovascular Science
• Molecular Biology
• Biophysics

Background:

• Cigarette smoking is a major risk factor for cardiovascular disease, linked to vascular endothelial dysfunction and thrombosis.
• The precise mechanisms by which smoking promotes thrombosis remain incompletely understood.
• Thrombomodulin (TM) is a crucial anticoagulation cofactor on endothelial cells that inhibits intravascular coagulation by binding thrombin.

Purpose of the Study:

• To investigate the impact of cigarette smoke extract (CSE) on the binding interaction between thrombomodulin (TM) and thrombin.
• To elucidate the molecular mechanisms underlying smoking-induced thrombosis.

Main Methods:

• Utilizing atomic force microscopy (AFM) based single-molecule force spectroscopy.
• Conducting both in vitro and live-cell experiments to assess TM-thrombin binding probability.

Main Results:

• CSE significantly reduced the binding probability between TM and thrombin.
• Demonstrated a direct effect of CSE on a critical anticoagulation pathway.

Conclusions:

• Cigarette smoke extract interferes with the ability of thrombomodulin to bind thrombin.
• This disruption of TM-thrombin interaction offers a novel mechanistic insight into how smoking promotes thrombosis and cardiovascular disease.