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Increase of thrombus in the coronary arteries is positively correlated with the level of heat-shock protein 72 (HSP72) in the blood of patients with acute myocardial infarction (AMI). Platelet aggregation participates in thrombus formation on ruptured plaque in AMI. In this study, we aimed to clarify the role of HSP72 in thrombus formation by evaluating the effects of HSP72 on platelet aggregation. Platelet aggregation activities were measured in platelet-rich plasma obtained from male Sprague-Dawley rats with or without the platelet activators, such as adenosine diphosphate (ADP), collagen, thrombin receptor-activating peptide-6 (TRAP-6), ristocetin, and arachidonic acid. Changes in aggregation were estimated by the co-addition of recombinant HSP72 and anti-HSP72 antibodies. Our results showed that addition of HSP72 increased platelet aggregation in the presence of low concentrations of ADP, collagen, TRAP-6, ristocetin, and arachidonic acid. Increased platelet aggregation stimulated by ADP and HSP72 was reduced by the co-addition of anti-HSP72 antibodies. Thus, these findings suggested that HSP72 was released extracellularly in response to stress, promoting thrombus formation and AMI. Additionally, treatment with anti-HSP72 antibodies may control platelet aggregation induced by extracellular HSP72.

<b>Heat-shock protein 72 promotes platelet aggregation induced by various platelet activators in </b><b>rats </b>