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The trypsin-sensitive cholecystokinin-releasing peptide is a peptide purified from rat pancreatic juice on the basis of its stimulatory activity toward pancreatic enzyme secretion. We postulate that the peptide acts as a mediator of pancreatic enzyme secretion in response to dietary protein intake and that it (designated as "monitor peptide" from its role in the intestine) could be responsible for the feedback regulation of pancreatic enzyme secretion. About 20 nmol of the highly purified peptide were obtained from 800 ml of rat pancreatic juice by reverse-phase high performance liquid chromatography. It was then sequenced. The peptide comprises 61 amino acid residues (Table I). It has a sequence that closely resembles that of a highly conserved region in pancreatic secretory trypsin inhibitors (PSTIs, Kazal type inhibitor): -Ile-Tyr-Asx-Pro-Val-Cys-Gly-Thr-Asx-Gly-. However, the peptide is less related to other mammalian PSTIs than they are to each other. The additional 5 residues at the NH2 terminus make the peptide larger than the common 56-residue PSTIs. The trypsin-sensitive cholecystokinin-releasing peptide is to be classified as a Kazal-type inhibitor and may be one of the rat PSTIs or a related peptide. The present results and increasing evidence from other laboratories and ours suggest that Kazal-type inhibitors play previously unrecognized multiple physiological roles.
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