Abstract
The effect of intravenous infusion of synthetic motilin on gastric motor activity was investigated by means of chronically implanted force transducers in 4 conscious dogs. Since the gastric motor pattern consisted of two major subpatterns, digestive and interdigestive motor activity, motilin was tested for its motor stimulating activity in both states. It was found that motilin had no influence upon gastric motor activity in the digestive state. However, during the interdigestive state, intravenous infusion of motilin in doses of 0.3–2.7 μg/kg/hr induced motor activity similar to the naturally occurring interdigestive contractions in a dose-related fashion. Since motilin is released by duodenal alkalinization in the dog, it may be postulated that motilin is a substance to control the interdigestive contractions in the dog, although other reports describe motilin release by duodenal acidification and inhibition of gastric emptying in man. Endogenous stimuli leading to motilin release may be different among species. The present study clearly indicates that motilin induces a contractile pattern similar to that seen during the interdigestive state in conscious dogs.
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Brown JC, Mutt V, Dryburgh JR: The further purification of motilin, a gastric motor activity stimulating polypeptide from the mucosa of the small intestine of hogs. Can J Physiol Pharmacol 49:399–405, 1971
Brown JC, Cook MA, Dryburgh JR: Motilin, a gastric motor activity stimulating polypeptide: Final purification, amino acid composition, and C-terminal residues. Gastroenterology 62:401–404, 1972
Brown JC, Cook MA, Dryburgh JR: Motilin, a gastric motor activity stimulating polypeptide: The complete amino acid sequence. Can J Biochem 51:533–537, 1973
Brown JC, Johnson LP, Magee DF: Effect of duodenal alkalinization on gastric motility. Gastroenterology 50:333–339, 1966
Dryburgh JR, Brown JC: Radiommunoassay for motilin. Gastroenterology 68:1169–1176, 1975
Wünsch E, Brown JC, Deimer K-H, et al: Zur Synthese von Norleucine-13-Motilin. Z Naturforsch 28c:235–240, 1973
Ruppin H, Domschke S, Domschke W, et al: Effect of 13-Nle-motilin in man—Inhibition of gastric evacuation and stimulation of pepsin secretion. Scand J Gastroenterol 10:199–202, 1975
Domschke W, Strunz U, Schubert K, et al: Analysis of the motor effect of 13-Nle motilin on the isolated rabbit duodenum. Presented at 5th World Congress of Gastroenterology, Abstract, 1974, p 200
Strunz U, Domschke W, Mitznegg P, et al: Analysis of the motor effects of 13-norleucine motilin on the rabbit, guineapig, rat and human alimentary tractin vitro. Gastroenterology 68:1485–1491, 1975
Yajima H, Kai Y, Kawatani H: Synthesis of the docosapeptide corresponding to the entire amino acid sequence of porcine motilin. JCS Chem Commun 1975:159–160, 1975
Itoh Z, Aizawa I, Takeuchi S, et al: Diurnal changes in gastric motor activity in conscious dogs. Am J Dig Dis 22:117–124, 1977
Itoh Z, Carlton N, Lucien HW, et al: Long-term plastic tubing implantation into the external jugular vein for injection or infusion in the dog. Surgery 66:768–770, 1969
Schubert H, Brown JC: Correction to the amino acid sequence of porcine motilin. Can J Biochem 52:7–8, 1974
Boldyreff W: Periodische Arbeit des Verdauungsapparat bei leerem Magen. Erg Physiol 11:189–193, 1911
Hoelzel F: The relation between the secretory and motor activity in the fasting stomach (man). Am J Physiol 73:463–469, 1925
Reinke DA, Rosenbaum AN, Bennett DR Pattern of dog gastrointestinal contractile activityin vivo with extraluminal force transducers. Am J Dig Dis 12:113–141, 1967
Mitznegg P, Bloom SR, Domschke W, et al: Release of motilin after duodenal acidification. Lancet 1:888–889, 1976
Bloom SR: Radioimmunoassay for motilin: clue for clinical importance, Presented at the International Symposium on Motilin: Origin, Chemistry and Actions. Organized by L Demling and W Domschke in Erlangen West Germany, June 18–19, 1976. The proceedings will be published in Scand J Gastroenterol as a symposium volume.
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This work was in part supported by a Grant for Cancer Research to Z. Itoh from the Ministry of Public Health and Welfare of Japan.
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Itoh, Z., Takeuchi, S., Aizawa, I. et al. Effect of synthetic motilin on gastric motor activity in conscious dogs. Digest Dis Sci 22, 813–819 (1977). https://doi.org/10.1007/BF01694513
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DOI: https://doi.org/10.1007/BF01694513