title: Antithrombotic and antiplatelet activities of 2-chloro-3-[4-(ethylcarboxy)-phenyl]-amino-1,4-naphthoquinone (NQ12), a newly synthesized 1,4-naphthoquinone derivative.
abstract: The possibility of NQ12 (2-chloro-3-[4-(ethylcarboxy)-phenyl]-amino-1,4-naphthoquinone) as a novel antithrombotic agent and its mode of action were investigated. The effects of NQ12 on platelet aggregation in human platelet-rich plasma in vitro, in rats ex vivo, and on murine pulmonary thrombosis in vivo, as well as the mode of antithrombotic action were examined. NQ12 potently inhibited ADP-, collagen-, epinephrine-, and calcium ionophore-induced human platelet aggregations in vitro concentration-dependently. NQ12 significantly inhibited rat platelet aggregation in an ex vivo study. NQ12 prevented murine pulmonary thrombosis in a dose-dependent manner. However, NQ12 did not affect coagulation parameters such as activated partial thromboplastin time, prothrombin time, and thrombin time. NQ12 inhibited fibrinogen binding to the platelet surface GPIIb/IIIa receptor, but failed to inhibit binding to the purified GPIIb/IIIa receptor. Thromboxane B(2) formation caused by thrombin or collagen was inhibited significantly by NQ12. The phosphoinositide breakdown induced by thrombin or collagen was inhibited concentration-dependently by NQ12. These results suggest that NQ12 may be a promising antithrombotic agent, and its antithrombotic activity may be due to antiplatelet aggregation activity, which may result from the inhibition of phosphoinositide breakdown and thromboxane A(2) formation.
authors.affiliation: College of Pharmacy, Chungbuk National University, 361-763, Cheongju, South Korea.
authors.forename: D Y
authors.initials: DY
authors.lastname: Yuk
authors.forename: C K
authors.initials: CK
authors.lastname: Ryu
authors.forename: J T
authors.initials: JT
authors.lastname: Hong
authors.forename: K H
authors.initials: KH
authors.lastname: Chung
authors.forename: W S
authors.initials: WS
authors.lastname: Kang
authors.forename: Y
authors.initials: Y
authors.lastname: Kim
authors.forename: H S
authors.initials: HS
authors.lastname: Yoo
authors.forename: M K
authors.initials: MK
authors.lastname: Lee
authors.forename: C K
authors.initials: CK
authors.lastname: Lee
authors.forename: Y P
authors.initials: YP
authors.lastname: Yun
mesh_terms: D000818:Animals; D001777:Blood Coagulation / Q000187:drug effects; D001792:Blood Platelets / Q000187:drug effects / Q000378:metabolism; D004195:Disease Models, Animal; D005343:Fibrinolytic Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D007295:Inositol Phosphates / Q000378:metabolism; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D009281:Naphthalenes / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D010974:Platelet Aggregation / Q000187:drug effects*; D010975:Platelet Aggregation Inhibitors / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D019039:Platelet Glycoprotein GPIIb-IIIa Complex / Q000187:drug effects / Q000378:metabolism; D011655:Pulmonary Embolism / Q000517:prevention & control; D051381:Rats; D017207:Rats, Sprague-Dawley; D013929:Thromboxane B2 / Q000378:metabolism
chemical_list: C403720:2-chloro-3-((4-ethyl-phenyl)-amino)-1,4-naphthalendione; D005343:Fibrinolytic Agents; D007295:Inositol Phosphates; D009281:Naphthalenes; D010975:Platelet Aggregation Inhibitors; D019039:Platelet Glycoprotein GPIIb-IIIa Complex; C092449:inositol 1,2,3-trisphosphate; D013929:Thromboxane B2