Abstract
The proteolytic effects of collagenase and elastase from human granulocytes were investigated on the human complement components C3 and C5 in serum and with purified components. The conversion of C3 was analyzed with crossed immunoelectrophoresis as described by Ganrot, and the conversion of C5 was detected with immunoelectrophoresis according to Scheidegger's method. Collagenase converted C3 to C3b but had no detectable effect on C5. Elastase converted C3 to C3b and converted C5 to a C5b-like fragment. The proteolysis by collagenase and elastase in serum was not detectable until the molar ratio for enzyme to the protease inhibitors alpha1-antitrypsin and alpha2-macroglobulin was greater than 1.
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