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Air pollution and thrombosis: an experimental approach
A Nemmar1, B Nemery, M F Hoylaerts
1Laboratory of Pneumology (Lung toxicology), University of Leuven, Belgium.
Pathophysiology of Haemostasis and Thrombosis
|September 19, 2003
Summary
Air pollution exposure, particularly from ultrafine particles, promotes blood clot formation. This finding helps explain the link between air quality and heart attacks.
Area of Science:
- Environmental Health
- Cardiovascular Research
- Toxicology
Background:
- Air pollution is a known risk factor for cardiovascular mortality.
- Inhaled ultrafine particles can enter the bloodstream.
- The precise mechanisms linking air pollution to acute cardiovascular events require further elucidation.
Purpose of the Study:
- To investigate the pro-thrombotic effects of inhaled ultrafine particles.
- To provide a biological mechanism for the association between air pollution and acute myocardial infarction.
Main Methods:
- Assessing thrombus formation in a hamster femoral artery model using amine-polystyrene ultrafine particles.
- Evaluating platelet function using the Platelet Function Analyser (PFA) with diesel exhaust particles.
- Measuring the effect of diesel exhaust particles on ex vivo blood samples.
Main Results:
- Amine-polystyrene ultrafine particles significantly enhanced experimental thrombus formation and reduced closure time in the PFA.
- Diesel exhaust particles demonstrated thrombogenic effects within one hour of intratracheal instillation.
- Ex vivo analysis showed diesel exhaust particles shortened closure time, indicating enhanced platelet aggregation.
Conclusions:
- Inhaled ultrafine particles possess pro-thrombotic properties.
- These findings offer a plausible biological explanation for the link between air pollution exposure and acute myocardial infarction.
- Ultrafine particle-induced thrombosis is a key mechanism in air pollution's cardiovascular impact.