Effect of NaC1 on inactivation of bovine thrombin by antithrombin III in the presence of low affinity-heparin or dextran sulfate.
Heparin with low affinity (LA-heparin) to antithrombin III (AT III) enhanced the rate of inactivation of thrombin by AT III. The enhancement of the rate was saturable with AT III and was proportional to the LA-heparin concentration. Although the rate-enhancement in the presence of LA-heparin decreased with increase in NaC1 concentration, it was comparable with that in the presence of high affinity-heparin (HA-heparin) in the absence of NaC1. Inactivation of thrombin by AT III in the presence of dextran sulfate (DS) was also sensitive to NaC1 concentration. These findings indicate that free AT III is favorable for binding to the complexes of thrombin and highly sulfated polysaccharides having low affinities to AT III in the absence of NaC1.
G
G
Oshima
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K
Nagasawa
D000818:Animals; D000990:Antithrombin III / Q000494:pharmacology*; D002417:Cattle; D016264:Dextran Sulfate; D003911:Dextrans / Q000494:pharmacology; D006493:Heparin / Q000494:pharmacology*; D006863:Hydrogen-Ion Concentration; D066298:In Vitro Techniques; D007700:Kinetics; D012965:Sodium Chloride / Q000494:pharmacology*; D013917:Thrombin / Q000037:antagonists & inhibitors*
D003911:Dextrans; D012965:Sodium Chloride; D000990:Antithrombin III; D006493:Heparin; D016264:Dextran Sulfate; D013917:Thrombin