The inhibition of platelet activation is considered a potential therapeutic strategy for the treatment of arterial thrombotic diseases; therefore, maintaining platelets in their inactive state has garnered much attention. In recent years, nanoparticles have emerged as important players in modern medicine, but potential interactions between them and platelets remain to be extensively investigated. Herein, we synthesized a new type of
carbon dot (CDOT) nanoparticle and investigated its potential as a new
antiplatelet agent. This nanoparticle exerted a potent inhibitory effect in
collagen-stimulated human platelet aggregation. Further, it did not induce cytotoxic effects, as evidenced in a
lactate dehydrogenase assay, and inhibited
collagen-activated
protein kinase C (PKC) activation and Akt (
protein kinase B),
c-Jun N-terminal kinase (JNK), and
p38 mitogen-activated protein kinase (MAPK) phosphorylation. The bleeding time, a major side-effect of using
antiplatelet agents, was unaffected in CDOT-treated mice. Moreover, our CDOT could reduce mortality in mice with
ADP-induced acute
pulmonary thromboembolism. Overall, CDOT is effective against platelet activation in vitro via reduction of the
phospholipase C/PKC cascade, consequently suppressing the activation of MAPK. Accordingly, this study affords the validation that CDOT has the potential to serve as a therapeutic agent for the treatment of arterial thromboembolic disorders.