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Objective   This study aimed to examine whether oxidized low-density lipoprotein (oxLDL) facilitates platelet aggregation, which is one cause for development of cardiovascular disease.Methods   The susceptibility of platelets to aggregation was monitored by light transmittance aggregometry and a laser light scattering method using low-density lipoprotein (LDL) and oxLDL as agonists. β-thromboglobulin (β-TG) levels released from platelets were also measured after incubation with or without oxLDL.Results   Platelet aggregation was suppressed by oxLDL as estimated by maximum light transmission. Additionally, adenosine diphosphate-induced further aggregation was slightly reduced by the presence of oxLDL. Aggregation levels of a low number of platelets, which was determined by the laser light scattering method, were lower upon addition of oxLDL compared with unoxidized LDL. After a short time of incubation, oxLDL increased secreted β-TG levels in platelet-rich plasma. However, further incubation with oxLDL caused relatively lower secreted β-TG levels compared with incubation with unoxidized LDL. This fluctuation was not due to β-TG degradation by oxLDL.Conclusions   Levels of oxLDL in vitro weakly activate platelets at an early stage, but then inhibit platelet function, such as aggregation and β-TG secretion.

Highly oxidized low-density lipoprotein does not facilitate platelet aggregation