Inhibition of Human Tissue Kallikrein by α1-Proteinase Inhibitor

Abstract
Tissue kallikreins, human urinary and pancreatic kallikrein, were inhibited by .alpha.1-proteinase inhibitor, but the other inhibitors in plasmas could not inhibit kallikrein activity towards a synthetic substrate. The kallikrein-inhibitor complex was identified by Sephadex G-150 gel filtration. The inhibition rate of urinary kallikrein by .alpha.1-proteinase inhibitor was smaller than that of pancreatic kallikrein, and a less acidic subform of kallikrein was inhibited more rapidly than the more acidic one. Asialo-kallikrein was inhibited more rapidly than native kallikrein.

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