Platelets promote angiogenesis by releasing angiogenesis-regulating factors from their α-granules upon aggregation. This effect has both physiologic and pathologic significance as it may contribute to carcinogenesis. Platelet α-granule release and aggregation are regulated, in part, via protein kinase C (PKC) α and β signaling. Our study investigated the effects of PKC inhibition on aggregation...

OBJECTIVE Effects on platelet aggregation of adenosine triphosphate (ATP) released from damaged cells and from platelets undergoing exocytosis have not been clearly established. In this study we report on the effects of ATP on platelet aggregation in whole blood. METHODS AND RESULTS Aggregation, measured using a platelet-counting technique, occurred in response to ATP and was maximal at 10 to...

TAKANO, S. Difference in Effects o f Vinblastine and V incristine on the Dog Platelet Aggregation. Tohoku J. exp. Med., 1981, 135 (1), 79-85 The present study was attempted to determine difference in effects of vinblastine and vincristine on ADP-induced aggregation of dog platelets. Vinblastine manifested biphasic influence depending upon concentrations, i.e., in low concentrations (0.2-20 ,ug/...

Cilostazol is clinically used for the treatment of ischemic symptoms in patients with chronic peripheral arterial obstruction and for the secondary prevention of brain infarction. Recently, it has been reported that cilostazol has preventive effects on atherogenesis and decreased serum triglyceride in rodent models. There are, however, few reports on the evaluation of cilostazol using atheroscl...

The effects of various statins on platelet aggregation in blood samples from normal and diabetic rabbits were measured. All of the statins used in our study inhibited platelet aggregation by about 20% at 1 microM. Our results show that diabetes increased the rate of platelet aggregation from 48 +/- 5% to 72 +/- 8%, however, statins inhibited the rate of platelet aggregation by about 60% (p < 0....

This study investigated the effects of isotenuifolide and tenuifolide B from the stems of Cinnamomum tenuifolium on adenosine diphosphate (ADP)-induced human platelet aggregation. Treatment of human platelet-rich plasma with isotenuifolide (1 and 2 μg/μL) and tenuifolide B (1, 2 and 4 μg/μL) did not have any significant effect on human platelet aggregation in vitro, however, treatment of human ...

BACKGROUND Mild hypothermia is currently standard of care for cardiac arrest patients in many hospitals and a common belief is that hypothermia attenuates platelet aggregation. We wanted to examine the effects of clopidogrel on platelet aggregation during hypothermia. METHODS Platelet reactivity at 37° C and 33° C was evaluated by light transmission aggregometry and vasodilator-stimulated pho...

To examine the temporal effects of plasmin generated in vivo on platelet function, we infused tissue-type plasminogen activator (t-PA) in rabbits over 3 hours and measured ex vivo platelet aggregation. We noted an initial increase in the aggregation response to ADP occurring 30 minutes after the start of infusion. This enhanced response was short-lived and by 180 minutes was reduced, compared w...

OBJECTIVE To determine the optimum conditions for the demonstration of an antiplatelet effect of nitric oxide and to use these conditions to elucidate the effects of a transdermal glyceryl trinitrate patch on platelet aggregation in normal volunteers. METHODS An open prospective crossover study. The effects of nitric oxide on platelet aggregation in whole blood and platelet rich plasma as sti...