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In this study, we investigated the effect of water extract from rice bran (RB) on ADP (20 μM)-stimulated platelet aggregation. RB dose-dependently inhibited ADP-induced platelet aggregation, and its IC50 value was 224.0 μg/mL, which was increased by adenylate cyclase inhibitor SQ22536 and cAMP-dependent protein kinase (A-kinase) inhibitor Rp-8-Br-cAMPS. RB elevated the phosphorylation of VASP (Ser 157 ) which was also inhibited by SQ22536 and Rp-8-Br-cAMPS. It is thought that RB-elevated cAMP contributed to the phosphorylation of VASP (Ser 157 ) to inhibit ADP-induced platelet aggregation. Therefore, we demonstrate that RB has an antiplatelet effect via cAMP-dependent phosphorylation of VASP (Ser 157 ), and RB may have preventive or therapeutic potential for platelet aggregation-mediated diseases, such as thrombosis, myocardial infarction, atherosclerosis, and ischemic cerebrovascular disease.

journal of experimental and biomedical sciences/biomedical science letters

Inhibitory Effects of Water Extract from Rice Bran Due to cAMP-dependent Phosphorylation of VASP (Ser<sup>157</sup>) on ADP-induced Platelet Aggregation

Inhibitory Effects of Water Extract from Rice Bran Due to cAMP-dependent Phosphorylation of VASP (Ser157) on ADP-induced Platelet Aggregation

Inhibitory Effects of Water Extract from Rice Bran Due to cAMP-dependent Phosphorylation of VASP (Ser¹⁵⁷) on ADP-induced Platelet Aggregation