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Changes in blood coagulation and platelet functions in vivo in healthy smoking and non-smoking individuals of different age groups were studied. Blood samples were obtained on four different occasions (6 months apart during 1978-1980) from each of the 21 smokers and 42 non-smokers (age range 35-79), and analyzed. Statistically significant changes (p &lt; 0.03) associated with cigarette smoking are:1) increases in platelet count and fibrinogen in plasma;2) elevation in a platelet procoagulant, platelet factor-3 (PF-3) activity in platelet-poor plasma (PPP); 3) increases in serum levels of α1-antitrypsin, orosomucoid, haptoglobin and properdin factor B; and 4) shortening of the lag period of collagen-induced platelet aggregation. Filtration through Millipore filters removed membrane vesicles which are enriched with PF-3 activity from the PPP. The difference in PF-3 activity in filtered plasma between the smoking and non-smoking groups were no longer statistically significant. The results are consistent with the interpretation that enhanced PF-3 activity in plasma occurs in association with cigarette smoking and results from the liberation into plasma of platelet membranes enriched in PF-3 activity.

Alteration In Platelet Factor 3 Activity In Plasma In Association With Cigarette Smoking