Great variation in the response of tissue plasminogen activa


Apr 20, 2013
Great variation in the response of tissue plasminogen activator activity, plasminogen activator inhibition and plasmin inhibition to endotoxin, aspirin and endotoxin after administration of aspirin ... 4888901983

The effect of endotoxin, aspirin and endotoxin after administration of aspirin on the tissue plasminogen activator activity (PAA), plasminogen activator inhibition (PAI) and plasmin inhibition (PI) was studied in the rat. PAA, PAI and PI were determined in key organs (brain, heart, lungs, kidneys, liver and aorta) spectrophotometrically by procedures involving hydrolysis of the chromogenic substrate S-2251. Aspirin at three different doses had not any significant effect on tissue PAA; PAI and PI were affected in several organs. Four hours after a sustained infusion of endotoxin PAA was found to be increased in brain, kidneys and aorta, decreased in heart and lungs, while in liver the PAA was unchanged compared to controls. Changes in PAI and PI showed also a tissue variation. In endotoxin-infused rats pretreated with aspirin the PAA changes induced by endotoxin were prevented or modified; PAI and PI were affected in most organs studied. However, this effect of aspirin was varying and depending on the tissue, the parameter studied and the dose of aspirin. In some organs, as the heart and lungs, changes in PAI or PI were noticed, while neither aspirin nor endotoxin separately induced such changes in these organs. Also, a differential response of PAI and PI to the same stimulus in the same tissue was a noteworthy finding. The results of the present study show that the response of PAA, PAI and PI to aspirin depends on the tissue, the physiological or pathophysiological condition of the tissue and the dose of the aspirin.
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