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Warfarin

華法林
Mechanism of action:
Warfarin 是一種維生素 K 拮抗劑(vitamin K antagonist)。Warfarin 會抑制維生素 K 環氧化物還原酶複合體 1(VKORC1,vitamin K epoxide reductase complex 1),阻斷氧化型維生素 K 再生為還原型維生素 K。還原型維生素 K 是 γ-麩胺酸羧化酶(γ-glutamyl carboxylase)的必要輔因子,當其缺乏時,各種凝血因子(如凝血因子 II、VII、IX、X 等)無法完成 γ-羧化(γ-carboxylation),因而無法有效結合鈣離子並附著於磷脂表面,而抑制血栓形成。
Reference(s):
1. Ansell J et al. (2004). The pharmacology and management of the vitamin K antagonists: the Seventh ACCP Conference on Antithrombotic and Thrombolytic Therapy. Chest.
2. Whitlon DS et al. (1978). Mechanism of coumarin action: significance of vitamin K epoxide reductase inhibition. Biochemistry.
3. Li T et al. (2004). Identification of the gene for vitamin K epoxide reductase. Nature.
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