Summary
To investigate β2-adrenergic agonist-mediated effects on coronary fluxes of local fibrinolytic factors,
healthy anaesthetised and instrumented pigs (n=10) were studied during infusion of
isoprenaline (IPR) into the left main coronary artery. Coronary net fluxes of total
t-PA antigen, active t-PA and total PAI-1 antigen were determined at baseline and
at 3, 5, 7 and 10 minutes of IPR infusion. During IPR, net release of total t-PA increased
in a biphasic pattern with transiently high levels at 3 (+440 %) and 7 minutes (+620%)
and returned towards baseline at 10 minutes. Net coronary release of active t-PA increased
with maximum levels at 3 minutes (+50%). Baseline coronary net flux of total PAI –1
showed a decrease which was most pronounced at 10 minutes. To conclude, a fast β2agonist-mediated local release of t-PA into the coronary vasculature was demonstrated.
For total t-PA, this response was characterised by a biphasic release profile.
Keywords
Tissue-type plasminogen activator - plasminogen activator inhibitor - porcine - coronary
circulation - β
2-adrenergic agonism