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Mechanisms Underlying Gut Hormone Secretion Using the Isolated Perfused Rat Small Intestine
Published on: February 26, 2019
Intestinal Distension Induced by Luminal D-allulose Promotes GLP-1 Secretion in Male Rats.
Shiori Mizuma1, Masaki Hayakawa1, Tohru Hira1,2
1Laboratory of Nutritional Biochemistry, Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan.
D-allulose stimulates glucagon-like peptide-1 (GLP-1) secretion by causing intestinal distension. This physical mechanism, rather than metabolism, is a key driver for GLP-1 release, offering new insights into its regulation.
Area of Science:
- Endocrinology
- Gastroenterology
- Metabolism
Background:
- Nutrients stimulate glucagon-like peptide-1 (GLP-1) secretion through intracellular metabolism.
- D-allulose, a non-metabolizable fructose epimer, stimulates GLP-1 secretion, but the mechanism is unclear.
- Previous observations linked allulose administration to intestinal distension and increased GLP-1 secretion in rats.
Purpose of the Study:
- To investigate whether intestinal distension induced by allulose and other factors stimulates GLP-1 secretion in rats.
- To elucidate the mechanism behind allulose-induced GLP-1 secretion.
Main Methods:
- Oral administration of allulose with or without carbonated water.
- Administration of poorly absorbable substances (polyethylene glycol 1000, D-mannitol) and a non-absorbable substance (cellulose).
- Intraileal administration of air to induce intestinal distension.
- Measurement of GLP-1 secretion and correlation with intestinal content volume and diameter.
Main Results:
- Oral coadministration of carbonated water enhanced allulose-induced GLP-1 secretion.
- Poorly absorbable substances (polyethylene glycol 1000, D-mannitol) stimulated GLP-1 secretion, while an insoluble substance (cellulose) did not.
- GLP-1 secretion increased with the absolute amount of allulose, correlating positively with intestinal content volume and diameter.
- Intraileal air administration induced GLP-1 secretion.
Conclusions:
- Allulose promotes GLP-1 secretion, at least partially, through intestinal distension.
- Intestinal distension represents a novel mechanism for GLP-1 secretion.
- Physical stimulation of the intestine may contribute to postprandial GLP-1 secretion.
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