Abstract
Pancreatic polypeptide (PP) is released after ingestion of protein-fat meals and following administration of some gut hormones (CCK and bombesin), but the hormonal contribution to the physiological release of PP has not been elucidated. We used specific and potent CCK-receptor antagonist, L-364,718, administered intravenously in a dose of 0.5 μmol/kg or intraduodenally in a dose of 2 μmol/kg to assess the role of CCK in the release of PP. Exogenous CCK-8 infused intravenously in gradually increasing doses (12.5–400 pmol/kg/hr) caused a dose-dependent increase in plasma PP from basal 28±4 pM to 136±18 pM, and this PP increase was completely suppressed by both intravenous and intraduodenal administration of L-364,718. Meat feeding caused a dramatic increase in plasma PP from a basal level of 26±4 pM to a peak of about 190±32 pM, and the pretreatment with intravenous or intraduodenal L-364,718 reduced this PP increase by about 60%. Duodenal perfusion with oleate (0.12–4.0 mmol/hr) or L-Trp (0.12–4.0 mmol/hr) also increased plasma PP, reaching, respectively, 180±28 pM and 76±6 pM. Pretreatment with intravenous or intraduodenal L-364,718 completely abolished the plasma PP responses to oleate and l-Trp. Bombesin (100 pmol/kglhr) raised plasma PP to the level similar to that achieved by meat feeding and L-364,718 given intravenously or intraduodenally blocked completely these plasma PP increments. L-364,718 did not affect basal pancreatic secretion but reduced by about 60% the pancreatic protein response to meat feeding and abolished completely the protein response to exogenous CCK and bombesin as well as to duodenal perfusion with oleate or l-Trp. We conclude that the plasma PP concentrations increase during the pancreatic secretion induced by endogenous (meat feeding, duodenal oleate or amino acids) and exogenous (CCK or bombesin) stimulants and that this increase involves the CCK receptors.
Similar content being viewed by others
References
Larsson LI, Sundler F, Hakanson R: Pancreatic polypeptide—a postulated new hormone: Identification of its cellular storage site and electron microscopic immunocy-tochemistry. Diabetologia 12:211–226, 1976
Chance RE, Cieszkowski M, Jaworek J, Konturek SJ, Swierczek J, Tasler J: Effect of pancreatic polypeptide and its C-terminal hexapeptide on meal and secretin-induced pancreatic secretion in dogs. J Physiol (London) 314:1–9, 1981
Taylor IL, Solomon TE, Walsh JH, Grossman MI: Pancreatic polypeptide. Metabolism and effect of pancreatic secretion in dogs. Gastroenterology 76:524–528, 1979
Beglinger C, Taylor IL, Grossman MI, Solomon TE: Pancreatic polypeptide inhibits exocrine pancreatic responses to six stimulants. Am J Physiol 246:G286-G291, 1984
Hall K, Diamant N, El-Sharkway T, Greenberg G: Effect of pancreatic polypeptide on canine migrating motor complex and plasma motilin. Am J Physiol 245:G178-G185, 1983
Thor P, Konturek JW, Konturek SJ: Pancreatic polypeptide and intestinal motility in dogs. Dig Dis Sci 25:513–519, 1987
Wilson R, Boden G, Owens O: Pancreatic polypeptide responses to a meal and to intraduodenal amino acids and sodium oleate. Endocrinology 102:859–863, 1978
Beglinger C, Tylor IL, Grossman MI, Solomon TE: Role of stimulants of exocrine pancreatic secretion in dogs. Gastroenterology 87:530–536, 1984
Schwartz T: Pancreatic polypeptide: a unique model for vagal control of endocrine systems, J Auton Nerv Syst 9:99–111, 1983
Debas HT, Taylor IL, Seal AM, Passaro EP: Evidence for vagus-dependent pancreatic polypeptide-releasing factor in the antrum: Studies with the autotransplanted pancreas. Surgery 92:309–314, 1982
Lonovics J, Guzman S, Devitt P, Hejtmancik KE, Suddith RL, Rayford PL, Thompson JC: Release of pancreatic polypeptide in humans by infusion of cholecystokinin. Gastroenterology 79:817–822, 1980
Meyer FD, Gyr K, Hacki WH, Beglinger C, Jeker L, Varga L, Kayasseh L, Gillessen D, Stadler GA: The release of pancreatic polypeptide by CCK-octapeptide and some analogues in the dog. Gastroenterology 80:742–747, 1981
Jensen RT, Zhon Z-C, Murphy RB, Jones SW, Setnikar I, Rovati LA, Gardner JD: Structural features of various proglumide-related cholecystokinin receptor antagonists. Am J Physiol 251:G839-G846, 1986
Chang RSL, Lotti VJ: Biochemical and pharmacological characteristics of an extremely potent and selective nonpeptide cholecystokinin receptor antagonist. Proc Natl Acad Sci USA 83:4923–4926, 1986
Evans BE, Bock MG, Rittle KE, DiPardo RM, Whitter WL, Veber DF, Anderson PS, Freidinger RM: Design of potent orally effective nonpeptidal antagonists of the peptide hormone cholecystokinin. Proc Natl Acad Sci USA 83:4918–4922, 1986
Pendleton RG, Bendesky RJ, Schaffer L, Nolan TE, Gould RJ, Clineschimdt BV: Roles of endogenous cholecystokinin in biliary, pancreatic and gastric function: Studies with L-364,718, a specific cholecystokinin receptor antagonist. J Pharmacol Exp Ther 241:110–116, 1987
Konturek SJ, Pucher A, Radecki T: Comparison of vasoactive intestinal secretin in stimulation of pancreatic secretion. J Physiol (London) 255:497–509, 1976
Konturek SJ, Konturek JW, Lamers CB, Tasler J, Bilski J: Role of secretin and CCK in the stimulation of pancreatic secretion in conscious dogs. Effects of atropine and somatostatin. Int J Pancreatol 2:223–235, 1987
Swierczek JS, Konturek SJ, Tasler J, Jaworek J, Cieszkowski M: Pancreatic polypeptide and vagal stimulation of gastric and pancreatic secretion in dogs. Hepato-Gastroenterology 28:206–209, 1981
Liddle RA, Goldfine ID, Williams J-A: Bioassay of plasma cholecystokinin in rats: effects of food, trypsin inhibitor and alcohol. Gastroenterology 87:542–549, 1984
Liddle RA, Goldfine ID, Rosen MS, Taplitz R, Williams JA: Cholecystokinin bioactivity in human plasma: Molecular forms, responses to feeding and relationship to gallbladder contractions. J Clin Invest 75:1144–1152, 1985
Floyd J, Fajans S, Pek S, Chance RE: A newly recognized pancreatic polypeptide plasma levels in health and disease. Recent Prog Horm Res 33:519–570, 1977
Taylor IL, Impicciatore M, Carter DC, Walsh JH: Effect of atropine and vagotomy on pancreatic polypeptide response to a meal in dogs. Am J Physiol 235:E43-E44, 1978
Greenberg GR, Chan B, Nordgren SR, Allayne J: Effect of vagal blockade of food- and hormone-stimulated release of pancreatic polypeptide and motilin in dogs. Dig Dis Sci 10:946–953, 1985
Prinz RA, Sabbagh HE, Adrian TE, Bloom SR, Gardner I, Polak JM, Inokuchi H, Bishop AE, Welbourn RB: Neural regulation of pancreatic polypeptide release. Surgery 96:1011–1018, 1983
Niebel W, Eysselein VE, Singer MV: Pancreatic polypeptide response to a meal before and after cutting the extrinsic nerves of the upper gastrointestinal tract and the pancreas in the dog. Dig Dis Sci 32:1004–1009, 1987
Hosotani R, Chowdhury P, McKay D, Rayfordd PL: Mechanism by which L364,718 regulates biological action of CCK on pancreas. Gastroenterology 94:A1933, 1988
Solomon TE: Regulation of pancreatic secretion. Clin Gastroenterol 13:657–678, 1984
Konturek SJ, Tasler J, Cieszkowski M, Szewczyk K, Hladij M: Effect of cholecystokinin receptor antagonism on pancreatic responses to exogenous gastrin and cholecystokinin and to meal stimuli. Gastroenterology 94:1014–1023, 1988
Adrian TE, Bloom SR, Hermansen K, Iversen J: Pancreatic polypeptide, glucagon and insulin secretion from the isolated perfused canine pancreas. Diabetologia 14:413–417, 1978
Nealon WH, Beauchamp DR, Townsend CM, Thompson JC: Role of cholecystokinin in canine pancreatic exocrine response to bombesin stimulation. Am J Surg 153:96–100, 1987
Konturek SJ, Bielanski W, Kwiecien N, Konturek J, Czarnobilski K: Immunoneutralization of circulating pancreatic polypeptide and pancreatic secretion. Pancreas 2:536–544, 1987
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Konturek, S.J., Konturek, P., Bielański, W. et al. CCK receptors in release of pancreatic polypeptide (PP) in dogs. Digest Dis Sci 34, 849–856 (1989). https://doi.org/10.1007/BF01540269
Received:
Revised:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF01540269