Abnormal fibrinolysis in healthy male cigarette smokers: role of plasminogen activator inhibitors.
The extrinsic fibrinolytic system and its response to cigarette smoking was studied in five healthy male smokers 35-45 years old. Tissue plasminogen activator (t-PA) release in response to venous occlusion was intact both at 8:00 A.M. and 3:00 P.M. Acutely smoking two cigarettes neither stimulated fibrinolysis nor changed levels of t-PA or plasminogen activator inhibitors. Functional plasminogen activator inhibitor (PA-I) levels and euglobulin lysis times were higher in the smoking group than in a control group matched for age, sex, and body mass. Antigenic levels of PA-I 1, the PA-I derived from vascular endothelial cells and platelets, were similar in both groups. While smoking did not acutely alter fibrinolysis in chronic smokers, these individuals had a high frequency of abnormal fibrinolysis characterized by high levels of PA-I activity. This abnormality is due to either high specific activity of PA-I 1 or to the presence of other antigenically distinct plasminogen activator inhibitors. Abnormal fibrinolysis may be one mechanism contributing to the thrombotic diathesis of cigarette smokers.
Haire
W D
WD
Section of Oncology/Hematology, University of Nebraska Medical Center, Omaha 68105.
Goldsmith
J C
JC
Rasmussen
J
J
D000328:Adult; D000941:Antigens / Q000032:analysis; D005169:Factor VIII / Q000032:analysis; D005342:Fibrinolysis; D006023:Glycoproteins / Q000378:metabolism*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010960:Plasminogen Activators / Q000037:antagonists & inhibitors*; D015849:Plasminogen Inactivators; D012712:Serum Globulins / Q000378:metabolism; D012907:Smoking; D013997:Time Factors; D010959:Tissue Plasminogen Activator / Q000276:immunology; D014841:von Willebrand Factor / Q000276:immunology
D000941:Antigens; D006023:Glycoproteins; D015849:Plasminogen Inactivators; D012712:Serum Globulins; D014841:von Willebrand Factor; D005169:Factor VIII; D010960:Plasminogen Activators; D010959:Tissue Plasminogen Activator