Innovative thrombolytic strategy using a heterodimer diabody against TAFI and PAI-1 in mouse models of thrombosis and stroke.
Tine WyseureMarina RubioFrederik DenormeSara Martinez de LizarrondoMiet PeetersAnn GilsSimon F De MeyerDenis VivienPaul J DeclerckPublished in: Blood (2014)
Circulating thrombin-activatable fibrinolysis inhibitor (TAFI) and plasminogen activator inhibitor-1 (PAI-1) are causal factors for thrombolytic failure. Therefore, we evaluated an antibody-engineered bispecific inhibitor against TAFI and PAI-1 (heterodimer diabody, Db-TCK26D6x33H1F7) in several mouse models of thrombosis and stroke. Prophylactic administration of the diabody (0.8 mg/kg) in a thromboplastin-induced model of thromboembolism led to decreased lung fibrin deposition. In a model of cerebral ischemia and reperfusion, diabody administration (0.8 mg/kg, 1 hour postocclusion) led to a mitigated cerebral injury with a 2.3-fold reduced lesion and improved functional outcomes. In a mouse model of thrombin-induced middle cerebral artery occlusion, the efficacy of the diabody was compared to the standard thrombolytic treatment with recombinant tissue-type plasminogen activator (tPA). Early administration of diabody (0.8 mg/kg) caused a twofold decrease in brain lesion size, whereas that of tPA (10 mg/kg) had a much smaller effect. Delayed administration of diabody or tPA had no effect on lesion size, whereas the combined administration of diabody with tPA caused a 1.7-fold decrease in lesion size. In contrast to tPA, the diabody did not increase accumulative bleeding. In conclusion, administration of a bispecific inhibitor against TAFI and PAI-1 results in a prominent profibrinolytic effect in mice without increased bleeding.
Keyphrases
- cerebral ischemia
- mouse model
- pulmonary embolism
- subarachnoid hemorrhage
- atrial fibrillation
- brain injury
- blood brain barrier
- acute ischemic stroke
- heart failure
- blood pressure
- type diabetes
- metabolic syndrome
- oxidative stress
- drug induced
- acute myocardial infarction
- magnetic resonance imaging
- computed tomography
- insulin resistance
- coronary artery disease
- acute coronary syndrome
- skeletal muscle
- fluorescent probe
- smoking cessation