五步蛇蛇毒纤溶组分Ⅱ的分离和若干药效学的特征

五步蛇蛇毒经DEAE—sephadex A—50柱层析.获得15个蛋白组分。sephadex G—50柱再层析组分Ⅱ,呈单一个蛋白峰,聚丙酰胺凝胶电泳结果呈单一区带。狗血浆纤维蛋白平板法证实五步蛇蛇毒组分Ⅱ有溶解纤维蛋白的作用,同时狗血浆纤维蛋白热平板法还证实其溶解纤维蛋白的作用系直接性的。体外试管实验显示组分Ⅱ虽对纤维蛋白和纤维蛋白原均有溶解作用.但在浓度17.8mg·L~(-1)以下时.其溶解纤维蛋白活性相对较高。兔scO.1ml(500mg·L~(-1)组分Ⅱ未发现类似五步蛇全毒的出血反应。小白鼠腹腔注射纯化后的组分Ⅱ,LD_(50)为11.105 mg,kg~(-1).

Isolation and pharmacodynamic characterization of the fibrinolytic fraction Ⅱ of Agkistrodon acutus venom

By means of DEAE-sephadex A - 50 column chromatography, the venom of Agkistrodon acutus was separated into fifteen fractions. The fraction Ⅱ was rechro-matographed, on sephadex G - 50 column and a single peak was obtained. The polyacrylamide disc gel electrophoresis also showed a single band. The fraction Ⅱ had strong fibrinolytic activity on dog plasma fibrin plate and showed direct fibrinolytic effect on heated fibrin plate. In addition to fibrinolytic activity, the fraction Ⅱ had fibrinogenolytic activity, In vitro and at aconcentration less than 17. 8 mg·L-1,the potency of fibrinolysis was higher than that of fib-rinogenolysis. Local hemorrhage activity which is characteristic for crude venom of Agkistrodon a-cutus was not found when the fraction 1 was injected hyperdermically in rabbit. The ip LD50 value of the purified fraction Ⅱ was determined to be 11. 1 mg · kg-1 in mice and there was no gross hemorrhage found in the dead animals.