Exocrine pancreatic secretion in response to a new CCK-analog, CCK33 and caerulein in dogs

Abstract We studied the relative molar potencies of a newly synthetized cholecystokinin nonapeptide [Thr 28 ,Nle 31 ]CCK[25–33], natural porcine CCK33 and synthetic caerulein in conscious dogs with chronic gastric and pancreatic fistulas. Peptides were dissolved in albumin-containing solutions to prevent loss from solution. The three peptides were found to be equipotent on a molar basis in stimulating exocrine pancreatic secretion. As [Thr 28 ,Nle 31 ]CCK9 is a peptide less susceptible to oxidation than other forms of CCK, it is an interesting analog with many uses for medical and biological research.