Background: Coagulation activity of platelets plays an important role in thrombosis formation, Atherosclerotic plaque establishment and cardiovascular disorders. ASA are using as an anti platelet activity drug for patients with Coronary Artery Disease (CAD). Using of plant extraction as a complementary medicine for these patients (CAD) is mostly recommended by traditional medicine specialist. ...

We previously demonstrated that newly formed intracellular histamine mediates platelet aggregation in response to phorbol-12-myristate-13-acetate (PMA). We now report further investigations of the role of histamine during physiological activation of platelets by collagen. Platelets stirred with collagen produced histamine; the rise in histamine precedes the onset of aggregation. The dose respon...

The known platelet anti-aggregant effects of prostacyclin (epoprostenol) suggest that it may have therapeutic potential in conditions in which the platelet plays a pathophysiological role. The growth of venous thrombi is one such condition. We have attempted to determine, in a canine model of fresh venous thrombosis, whether prostacyclin infusion inhibits platelet accretion in vivo and how this...

Shear-induced binding of von Willebrand factor (vWf) to the platelet glycoprotein (GP) Ib/V/IX complex plays a key role in initiating platelet adhesion and aggregation at sites of vascular injury. This study demonstrated that pretreating human platelets with inhibitors of actin polymerization, cytochalasin D or latrunculin B, dramatically enhances platelet aggregation induced by vWf. The effect...

The serine proteases thrombin and trypsin are both powerful platelet agonists that act by cleaving the terminal portion of the thrombin receptor and allowing the new C-terminal to auto-stimulate the receptor. Synthetic peptides, termed thrombin receptor-activating peptides (TRAPs), have been shown to mimic many of the effects of thrombin. Here we have compared the effects of inhibitors on plate...

Calcium-channel blockers inhibit human platelet aggregation in vitro and ex vivo. To further evaluate the mechanism(s) responsible for the inhibition induced by this structurally heterogeneous group of compounds, we studied the effect of nifedipine and verapamil on human platelet aggregation in vitro. Neither 10 microM nifedipine nor 10 microM verapamil consistently inhibited the aggregation re...

Fluid shear stress in arteries and arterioles partially obstructed by atherosclerosis or spasm may exceed the normal time-average level of 20 dyne/cm2. In vitro, at fluid shear stresses of 30 to 60 dyne/cm2 applied for 30 seconds, platelet aggregation occurs. At these shear stresses, either large or unusually large von Willebrand factor (vWF) multimers in the suspending fluid exogenous to the p...

The effects on platelet aggregation of native rat chyle chylomicrons, chylomicron remnants, and chylomicrons that had been preincubated with rat or human EDTA-plasma, serum, whole blood, or pure human prothrombin were examined. The native chyle chylomicrons did not induce platelet aggregation but decreased ADP- and thrombin-induced platelet aggregation and [14C]serotonin release. Chylomicron re...

BACKGROUND Nanomaterials have numerous potential benefits for society, but the potential hazards of nanomaterials on human health are poorly understood. Nanomaterials are known to pass into the circulatory system in humans, causing vascular injuries that might play a role in the development of atherosclerosis. The present study aimed to determine the effects of chronic exposure to nanomaterials...

OBJECTIVE To determine the antithrombotic effects of SCH 602539, an analog of the selective protease-activated receptor (PAR)-1 antagonist vorapaxar (formerly SCH 530348) currently in advanced clinical development, and the P2Y(12) ADP receptor antagonist cangrelor, alone and in combination. METHODS AND RESULTS Multiple platelet activation pathways contribute to thrombosis. The effects of SCH ...