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High levels of immunoreactive pancreatic secretory trypsin inhibitor (PSTI) were demonstrated in the serum and peritoneal exudates of patients suffering from acute pancreatitis. Trypsin-like immunoreactivity in these fluids was found in complex with alpha 1-antitrypsin and in complex with alpha 2-macroglobulin and also as a free peak correlating to free trypsin(ogen). No trypsin-PSTI complexes or PSTI were demonstrated in the macroglobulin fraction of the peritoneal exudates. Saturated and partially saturated trypsin-alpha 2-macroglobulin complexes were prepared in vitro. PSTI was able to partially inhibit the BzArgNan-cleaving activity of both types of complexes in a slow dose-dependent non-linear reaction. Equilibrium was reached in each case within 1 h, but total inhibition was not reached even with large amounts of PSTI. Partially saturated trypsin-alpha 2-macroglobulin complexes were inhibited more readily than saturated complexes. The results support the concept of PSTI acting as a strictly local inhibitor of trypsin in compartments lacking plasma protease inhibitors.

On the Role of the Pancreatic Secretory Trypsin Inhibitor as an Inactivator of Trypsin-α 2 -Macroglobulin Complexes in Acute Pancreatitis