Original Articles

The American Journal of Digestive Diseases

, Volume 23, Issue 10, pp 929-935

First online:

Changes in plasma motilin concentration and gastrointestinal contractile activity in conscious dogs

  • Zen ItohAffiliated withG.I. Laboratories, Department of Surgery, Gunma University School of MedicineThird Division, Department of Internal Medicine, Kobe University School of MedicineLaboratory of Bio-organic Chemistry, Shizuoka College of Pharmaceutical Science
  • , Shinjin TakeuchiAffiliated withG.I. Laboratories, Department of Surgery, Gunma University School of MedicineThird Division, Department of Internal Medicine, Kobe University School of MedicineLaboratory of Bio-organic Chemistry, Shizuoka College of Pharmaceutical Science
  • , Isamu AizawaAffiliated withG.I. Laboratories, Department of Surgery, Gunma University School of MedicineThird Division, Department of Internal Medicine, Kobe University School of MedicineLaboratory of Bio-organic Chemistry, Shizuoka College of Pharmaceutical Science
  • , Kohzaburo MoriAffiliated withG.I. Laboratories, Department of Surgery, Gunma University School of MedicineThird Division, Department of Internal Medicine, Kobe University School of MedicineLaboratory of Bio-organic Chemistry, Shizuoka College of Pharmaceutical Science
  • , Tomohiko TaminatoAffiliated withG.I. Laboratories, Department of Surgery, Gunma University School of MedicineThird Division, Department of Internal Medicine, Kobe University School of MedicineLaboratory of Bio-organic Chemistry, Shizuoka College of Pharmaceutical Science
  • , Yutaka SeinoAffiliated withG.I. Laboratories, Department of Surgery, Gunma University School of MedicineThird Division, Department of Internal Medicine, Kobe University School of MedicineLaboratory of Bio-organic Chemistry, Shizuoka College of Pharmaceutical Science
  • , Hiroo ImuraAffiliated withG.I. Laboratories, Department of Surgery, Gunma University School of MedicineThird Division, Department of Internal Medicine, Kobe University School of MedicineLaboratory of Bio-organic Chemistry, Shizuoka College of Pharmaceutical Science
  • , Noboru YanaiharaAffiliated withG.I. Laboratories, Department of Surgery, Gunma University School of MedicineThird Division, Department of Internal Medicine, Kobe University School of MedicineLaboratory of Bio-organic Chemistry, Shizuoka College of Pharmaceutical Science

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Abstract

Simultaneous measurement of plasma motilin concentration and gastrointestinal contractile activity was made in 12 healthy dogs. Plasma motilin concentration was measured by radioimmunoassay and gastrointestinal contractile activity was monitored by means of chronically implanted force transducers. During the interdigestive state, it was found that the plasma motilin concentration increased in complete accordance with the cyclical interdigestive contractions of the stomach. Furthermore, plasma motilin concentration was lowered by the ingestion of food, and it remained low as long as the gastric motor activity was in the digestive pattern. Since, as reported previously, the interdigestive contractions can be induced by the exogenous administration of motilin, we concluded that (1) motilin is released at constant intervals during the interdigestive state, and this release is suppressed by the ingestion of food; (2) motilin induces the interdigestive contractions of the stomach and duodenum; and (3) motilin is an interdigestive hormone and is the only known polypeptide hormone of the gut whose release is not induced by a meal.