vitamin k

Vitamin K (Kephton) has blood coagulation action and is important for coagulation factors, matrix-Gla protein, and osteocalcin.

Acenocoumarol is a Vitamin K antagonist and used as an anticoagulant.

Vitamin K1 (Phylloquinone) a fat-soluble, naturally occurring vitamin with antihemorrhagic and prothrombogenic activity.

Vitamin K2 (Menatetrenone) is a menaquinone compound and form of vitamin K2 with potential antineoplastic activity. Menatetrenone may act by modulating the signaling of certain tyrosine kinases, thereby affecting several transcription factors including c-myc and c-fos. This agent inhibits tumor cell growth by inducing apoptosis and cell cycle arrest.

Coumarin is a chemical compound poison found in many plants, notably in high concentration in the tonka bean, woodruff, and bison grass. It has clinical value as the precursor for several anticoagulants, notably warfarin.

Menadione (Vitamin K3) is a synthetic naphthoquinone without the isoprenoid side chain and biological activity, but can be converted to active vitamin K2, menaquinone, after alkylation in vivo.

Menaquinone-4 (Vitamin K2) is a vitamin K compound used as a hemostatic agent, and also as adjunctive therapy for the pain of osteoporosis.

During hypoxia in rats, levels of α-tocopherylquinon have been found to rise. alpha-Tocopherolquinone (Metarene) is reported to downregulate the respiratory activity of mitochondria. alpha-Tocopherolquinone has also displayed antioxidant activities after it is reduced to tocopherylhydroquinone.

Anisindione is a synthetic anticoagulant and an indanedione derivative. It prevents the formation of active procoagulation factors II, VII, IX, and X, as well as the anticoagulant proteins C and S, in the liver by inhibiting the vitamin K–mediated gamma-carboxylation of precursor proteins.

Dicoumarol (Dicumarol) is a hydroxycoumarin originally isolated from molding sweet-clover hay, with anticoagulant and vitamin K depletion activities. Dicoumarol is a competitive inhibitor of vitamin K epoxidereductase; thus, it inhibits vitamin K recycling and causes depletion of active vitamin K in blood. This prevents the formation of the active form of prothrombin and several other coagulant enzymes, and inhibits blood clotting.