Pancreatic Stone Protein

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Abstract
To quantitate pancreatic stone protein (PSP), a competitive radio- immunoassay using monoclonal antibodies to PSP extracted from pancreatic stones and a sandwich enzyme-linked immunosorbent assay (ELISA) using monospecific polyclonal antibodies to the secretory forms of PSP (PSP S) were established. When PSP concentrations were measured in pancreatic juice by radioimmunoassay, no difference could be found between patients suffering from chronic calcifying pancreatitis and other diagnostic groups. Yet, with the ELISA technique involving polyclonal antibodies, decreased concentrations were found in chronic calcifying pancreatitis patients when compared to controls (p < 0.001), chronic alcoholics without pancreatic symptoms, or obstructive pancreatitis patients. These discrepancies are discussed. The monoclonal antibodies recognizing the C-terminal part of PSS S (PSP S1), results from the radioimmunoassay indicate that the concentration of that polypeptide is identical in the juice of controls and patients. Results from the ELISA obtained with polyclonal antibodies raised against PSP S2-5 molecules, i.e., recognizing the PSP S1 part and the N-terminal portion of the molecule, indicate that the differences observed reflect differences in the juice concentration of that N- terminal peptide.

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