Abstract
Plasma immunoreactive secretin concentrations were determined in both healthy subjects and patients with duodenal ulcer. The modified radioimmunoassay method could detect significant increases in the plasma secretin concentrations when 0.05 N HCl was infused intraduodenally at a rate of 1.1 and 2.2 ml/min. The mean fasting plasma secretin concentration of 13 normal healthy subjects was 4.4±0.38 pg/ml which was significantly less (P<0.01) than that of 13 duodenal ulcer patients, 6.9±0.64 pg/ml. In both groups ingestion of a meat-containing meal resulted in significant increase in the plasma secretin concentrations. Recording of pH from proximal duodenum indicated that pH fell periodically below 4.5 during the postprandial period, indicating that only a short segment of proximal duodenum was exposed to acid after meal. The postprandial rise in plasma secretin levels was abolished when antral pH was raised above 5.5 by intragastric infusion of 0.3 N NaHCO3 solution. These observations indicate that although fasting plasma secretin levels are low, the plasma secretin levels increase significantly after ingestion of a meal. This increase appears to be attributable to an increased amount of acid delivered to the proximal duodenum, and patients with duodenal ulcer were found to release more secretin during the postprandial period than normal subjects.
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Chey WY, Tai HH, Rhodes RA, Lee KY, Hendricks J: Radioimmunoassay of Secretin: Further Studies. JC Thompson (ed.) Austin, University of Texas Press, 1976, pp 269–281
Rhodes RA, Tai HH, Chey WY: Observations on plasma secretin levels by radioimmunoassay in response to duodenal acidification and to a meat meal in humans. Am J Dig Dis 21:873–879, 1976
Tai HH, Korsch B, Chey WY: Preparation of I125-labeled secretin of high specific radioactivity. Anal Biochem 69:34–42, 1975
Tai HH, Chey WY: Simultaneous radioimmunoassay of secretin and gastrin. Anal Biochem 74:12–24, 1976
Tai HH, Chey WY: Rapid extraction of secretin from plasma by XAD-2 resin and its application in the radioimmunoassay of secretin. Anal Biochem 87:376–385, 1978
Ekins R, Newman B: Theoretical aspects of saturation analysis. Acta Endocrinol (Kbh) Suppl. 147:11–37, 1970
Scatchard G: The attractions of proteins for small molecules and ions. Ann NY Acad Sci 51:660, 1949
Snedecor CW, Cochran WG: Statistical Methods. Ames, Iowa State University Press, 1967, pp 98–145
Wilcoxon F: Individual comparison by ranking methods. Biom Bull 1:80–83, 1945
Malagelada J, Longstreth GF, Deering TB, Summerskill WHJ, Vay Liang W Go: Gastric secretion and emptying after ordinary meals in duodenal ulcer. Gastroenterology 73:989–994, 1977
Chey WY, Oliai A, Boehm M: Radioimmunoassay of secretin, II, Studies on correlation between RIA secretin levels and biological investigations. Endocrinology of the Gut. WY Chey, FP Brooks (eds). Thorofare, NJ, Charles B Slack, 1974, pp 320–326
Boden G, Essa N, Owen OE, Reichle FA, et al.: Effects of intraduodenal administration of HCl and glucose on circulating immunoreactive secretin and insulin concentrations. J Clin Invest 53:1185–1193, 1974
Boden G, Essa N, Owen OE: Effect of intraduodenal amino acids, fatty acids and sugar on secretin concentrations. Gastroenterology 68:722–727, 1975
Schaffalitzky de Muckadell OB, Fahrenkrug J: Secretin release in man. Current Status. Gastrointestinal Hormones and Pathology of the Digestive System V Speranza, N Basso, E Lezoche (eds). Rome, Italy, University of Rome Press (in press)
Hanssen LE, Torjesen P. Radioimmunoassay of secretin in human plasma. Scand J Gastroenterol 12:481–488, 1977
Thomas JE, Crider J: A quantitative study of acid in the intestine as a stimulus for the pancreas. Am J Physiol 131:394–356, 1940
Meyer JH, Way LW, Grossman MI: Pancreatic bicarbonate response to various acids in the duodenum of dogs. Am J Physiol 219:964–970, 1970
Bircher J, Mann CV, Carlson HC, et al: Intraluminal and juxtamucosal duodenal pH. Gastroenterology 48:472–477, 1965
Rhodes J, Prestwich CJ: Acidity at different sites in the proximal duodenum of normal subjects and patients with duodenal ulcer. Gut 7:509–514, 1966
Brooks AM, Grossman MI: Postprandial pH and neutralizing capacity of the proximal duodenum in dogs. Gastroenterology 59:85–89, 1970
Rhodes RA, Chey WY, Tai HH: Hypersecretinemia associated with renal failure. Clin Res 23:255A, 1975
Kolts BE, McGuigan JE: Radioimmunoassay measurement of secretin half-life in man. Gastroenterology 72:55–60, 1977
Chey WY, Rhodes RA, Tai HH. Role of secretin in man, II. Gut Hormones. Bloom SR (ed). Edinburgh, Churchill Livingstone, 1978, pp 193–196
Kim MS, Lee KY, Chey WY: Plasma immunoreactive secretin concentration (IRS) in fasting and postprandial state in dog. Clin Res 26:321A, 1978
Ivy AC, Grossman MI, Bachrach WH: Peptic Ulcer. Philadelphia, Blakiston, 1950
Baron JH: An assessment of the augmented histamine test in the diagnosis of peptic ulcer. Gut 4:243–253, 1963
Wormsley KG, Grossman MI: Maximal Histalog test in control subjects and patients with peptic ulcer. Gut 6:427–435, 1965
Isenberg JI, Cano R, Bloom SR: Effect of graded amounts of acid instilled into the duodenum on pancreatic bicarbonate and plasma secretin in duodenal ulcer patients and normal subjects. Gastroenterology 72:6–8, 1977
Shay H, Gershon-Cohen J, Fels SS: A theory explaining the local mechanism for gastric motor and secretory control and the alteration of these functions in uncomplicated duodenal ulcer. Ann Intern Med 16:772–781, 1942
Griffith GH, Owen GM, Campbell H, et al: Gastric emptying in health and in gastrointestinal disease. Gastroenterology 54:1–7, 1968
Fordtran JS, Walsh JH: Gastric acid secretion rate and buffer content of the stomach after eating. J Clin Invest 52:645–657, 1973
Dubois A, Smithson KW, Castell DO: Evidence for increased acid exposure of the duodenum in patients with duodenal ulcel. Clin Res 25:310A, 1977
Bloom SR: The development of a radioimmunoassay for secretin. Gastrointestinal Hormones. JC Thompson (ed). Austin, University of Texas Press, 1976, pp 257–268
Rayford PL, Curtis PJ, Fender HR, et al.: Plasma levels of secretin in man and dogs. Validation of a secretin radioimmunoassay. Surgery 658–666, 1976
Straus E, Yalow RS: Hypersecretinemia associated with marked basal hyperchlorhydria in man and dog. Gastroenterology 72:992–994, 1977
Meyer JH, Spingola LJ, Grossman MI: Endogenous cholecystokinin potentiates exogenous secretin on pancreas of the dog. Am J Physiol 221:742–747, 1971
Lee KY, Tai HH, Chey WY: Does vagus affect endogenous release of secretin? Gastrointestinal Hormones and Pathology of the Digestive System. V Speranza, N Basso, E Lezoche (eds). Rome, Italy, University of Rome Press, 1977 (in press)
Debas HT, Konturek SJ, Grossman MI: Effect of extragastric and truncal vagotomy on pancreatic secretion in dog. Am J Physiol 228:1172–1177, 1975
Kim MS, Lee KY, Chey WY: Effect of atropine on endogenous release of secretin and action of secretin on pancreatic secretion. Fed Proc 37:302, 1978
Bayliss WM, Starling EH: The mechanism of pancreatic secretion. J Physiol 28:325–353, 1902
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Chey, W.Y., Lee, Y.H., Hendricks, J.G. et al. Plasma secretin concentrations in fasting and postprandial state in man. Digest Dis Sci 23, 981–988 (1978). https://doi.org/10.1007/BF01263096
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DOI: https://doi.org/10.1007/BF01263096