The effect of chemical anti-inhibitors on fibrinolytic enzymes and inhibitors

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Abstrakt

Fibrinolytic enzyme inhibitors hamper the determination of the specific fibrinolytic serine protease activity. Reportedly, chemical anti-inhibitors eliminate the influence of fibrinolytic inhibitors, but it remains unclear to what extent they change the specific activity of fibrinolytic serine proteases. We studied the influence of chemical anti-inhibitors (chloramine T, flufenamate, sodium lauryl sulfate, and methylamine) on fibrinolytic serine proteases and fibrinolytic enzyme inhibitors using the physiological substrate fibrin as plasmin substrate. Low concentrations of chloramine T (0.01 mmol/l) prevent the inhibition of plasminogen activators. Higher concentrations (1 mmol/l) reduce the inhibition of plasmin, but simultaneously quench the plasminogen activator activity. Flufenamate eliminates most fibrinolytic enzyme inhibitors, but increases the activity of plasmin (apparent recovery 140%) and plasminogen activators (apparent recovery > 200%). Sodium lauryl sulfate eliminates the major fibrinolytic enzyme inhibitors, but increases the activity of plasmin (apparent recovery > 200%) and plasminogen activator, urokinase type (apparent recovery 130%). Methylamine affects only plasmin inhibition. We conclude that chemical anti-inhibitors may invalidate the analytical specificity of methods for the determination of fibrinolytic serine protease activity.

OriginalsprogEngelsk
TidsskriftClinica Chimica Acta
Vol/bind261
Udgave nummer1
Sider (fra-til)43-56
Antal sider14
ISSN0009-8981
StatusUdgivet - 6. maj 1997

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