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Two major proteins have been identified in sodium citrate extracts of bovine pancreatic stones from 15 glands with lithiasis. They were found to have a molecular weight of about 24 000 and were further characterized by a variety of methods, including polyacrylamide-gel electrophoresis in the presence of sodium dodecyl sulphate, isoelectric focusing, two-dimensional electrophoresis, immunodiffusion, immunoelectrophoresis and determination of N-terminal residues. These two immunologically and electrophoretically different proteins were definitely shown to be immunoreactive forms of anionic and cationic trypsinogens, which are normal components of pancreatic juice. However, in contrast with both secretory trypsinogens, the stone proteins displayed an important charge heterogeneity under isoelectric-focusing conditions. A possible role for both secretory trypsinogens in pancreatic lithogenesis is suggested by the reproducibility of the data. Finally, two minor proteins with a lower molecular weight (about 11 000--13 000) have also been found to be present in all extracts, but have not yet been identified.

Identification of two major proteins of bovine pancreatic stones as immunoreactive forms of trypsinogens