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PubMed1959

The streptokinase-plasminogen system. I. Its effect on the pathogenicity of streptococci and other organisms for mice.

Human plasminogen, plasma, or serum increased the pathogenicity of six streptokinase-positive streptococcal strains for mice. Combinations of commercial streptokinase and plasminogen or streptokinase and plasma did not usually increase mouse mortality to a greater degree than did plasminogen or plasma alone, suggesting that the maximal effective amount of streptokinase was produced by the organisms. The pathogenicity of Salmonella paratyphi (fibrinolysin variable) and a Group D streptococcus (streptokinase-negative) was not increased by plasminogen, plasma, or streptokinase, whereas a combination of streptokinase and plasminogen, or streptokinase and plasma did significantly increase mouse mortality resulting from these organisms. Combinations of certain concentrations of streptokinase and plasminogen increased the pathogenicity of a fibrinolysin-negative staphylococcal strain for mice to a greater extent than did either substance alone. The observed results provide evidence that streptokinase, by an interaction with plasminogen, contributes to the pathogenicity of streptokinase-positive streptococci.

Animals↗
PubMed1965

PHYSICAL AND IMMUNOLOGICAL DIFFERENCES AMONG STREPTOKINASES.

Two strains of Group A streptococci have been shown to produce streptokinases with different physical and immunologic characteristics. These streptokinases have been designated SK-A and SK-B. Examination of additional strains of Group A streptococci has indicated that SK-A is the more commonly encountered streptokinase. Studies comparing the two Group A streptokinases with streptokinase of Group C origin have indicated that the latter streptokinase is intermediate between SK-A and SK-B in regard to its electrophoretic mobility. Immunological data suggest that the Group C streptokinase differs from SK-B but is closely related to SK-A.

Antigen-Antibody Reactions↗