title: Relationship between smoking and fibrinolytic system with special reference to t-PA and PA inhibitor.
abstract: Recently tissue plasminogen activator (t-PA) has been clinically applied to the thrombolytic therapy of myocardial infarction. We investigated relationship between cigarette smoking and fibrinolytic system, namely the plasma level of t-PA antigen, plasminogen activator inhibitor (PAI), and PA activity. Nineteen healthy volunteers were asked to smoke for 10 min. The plasma levels of t-PA antigen, PAI activity, PA activity and catecholamine were measured together with measurement of blood pressure and heart rate before, soon after or 30 min after cigarette smoking. Plasma t-PA antigen after cigarette smoking increased to 8.83 +/- 3.11 ng per ml, significantly higher (p less than 0.005) than 6.35 +/- 1.7 ng/ml before cigarette smoking. Plasma PAI activity after cigarette smoking was 5.52 +/- 2.03 u/ml, significantly higher (p less than 0.05) than 4.18 +/- 1.06 u/ml before smoking. Plasma PA activity after smoking was 6.28 +/- 3.85 u/ml significantly higher (p less than 0.05) than 4. 49 +/- 2.74 u/ml. Furthermore, plasma epinephrine level after smoking increased to 59.1 +/- 52.4 pg/ml (p less than 0.1), compared with 36.2 +/- 22.5 pg/ml before smoking. There was a positive correlation between the rate of increase in plasma t-PA antigen and the rate of increase in plasma epinephrine after smoking. It is suggested that plasma epinephrine was related to the mechanism of increased plasma levels of t-PA in cigarette smoking.
mesh_terms: D000328:Adult; D001794:Blood Pressure; D004837:Epinephrine / Q000097:blood; D005342:Fibrinolysis; D006023:Glycoproteins / Q000097:blood*; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D010960:Plasminogen Activators / Q000037:antagonists & inhibitors*; D015849:Plasminogen Inactivators; D012907:Smoking / Q000009:adverse effects / Q000097:blood*; D010959:Tissue Plasminogen Activator / Q000097:blood*
chemical_list: D006023:Glycoproteins; D015849:Plasminogen Inactivators; D010960:Plasminogen Activators; D010959:Tissue Plasminogen Activator; D004837:Epinephrine