Differential effects of low-dose tissue plasminogen activator and streptokinase on platelet aggregation

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Abstract
Despite increasing success with low-dose intra-arterial thrombolysis, early rethrombosis still occurs. Platelet aggregation is thought to play a major part in this process. We have therefore investigated the effects of recombinant tissue plasminogen activator (rt-PA) and streptokinase on platelet function at doses currently used for peripheral arterial thrombolysis. Platelet-rich plasma was stirred at 37°C, with either streptokinase (100, 300 or 1000 units ml−1) or rt-PA (10 (T10), 30 (T30) and 100 (T100) mg l−1), with immediate addition of an agonist for platelet aggregation (thrombin, collagen, adenosine diphosphate (ADP) or adrenaline) at a predetermined threshold dose. Significant inhibition of collagen-induced and adrenaline-induced platelet aggregation was produced with rt-PA at all doses used (P < 0.05). With adrenaline as the agonist, T100 produced disaggregation to a mean(s.d.) level of 26 (11) per cent. Thrombin-stimulated platelet aggregation was significantly reduced by T100 (P < 0.001) and T30 (P < 0.01) only, disaggregation being dose-dependent and complete with T100. Using ADP as the agonist, T100 produced a significant reduction in maximum platelet aggregation (P < 0.01), and disaggregation was achieved to a mean(s.d.) level of 48(13) per cent. Streptokinase did not produce any significant changes in any parameter of aggregation.