Venous occlusion and chronic cigarette smoking: dose-dependent decrease in the measurable release of tissue-type...

Area of Science:

• Vascular Biology
• Hematology
• Toxicology

Background:

• Chronic cigarette smoking is a major risk factor for cardiovascular diseases.
• Smoking affects endothelial function and hemostasis.
• The impact of smoking on the release of specific hemostatic factors during vascular stress is not fully understood.

Purpose of the Study:

• To investigate the effect of chronic cigarette smoking on the release of von Willebrand factor (vWF) and tissue-type plasminogen activator (t-PA) during a venous occlusion test.
• To correlate smoking consumption with the measured release of these factors.

Main Methods:

• A venous occlusion test was performed on two groups of young healthy men: 20 non-smokers (control) and 21 smokers.
• Smoking history was quantified by pack-years.
• Levels of vWF antigen (vWF Ag) and t-PA antigen (t-PA Ag) were measured before and after venous occlusion.

Main Results:

• Smokers exhibited a significantly weaker release of t-PA compared to the control group (P < 0.02).
• No significant measurable release of vWF was observed in smokers during venous occlusion.
• An inverse correlation was found between cumulative tobacco consumption and the released amounts of t-PA Ag (r' = -0.994) and vWF Ag (r' = -0.889).

Conclusions:

• Chronic cigarette smoking is associated with significant disturbances in the biological response to venous occlusion.
• Impaired release of t-PA and vWF in smokers suggests compromised fibrinolytic capacity and endothelial dysfunction.
• These findings highlight the detrimental vascular effects of smoking on hemostatic regulation.