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Amylin and the gastrointestinal tract
1Department of Physiology and Pharmacology, University of Nottingham Medical School, UK.
Summary
Diabetes mellitus can alter gastric emptying rates. The hormone amylin, and its analogue pramlintide, slow gastric emptying, potentially through brainstem neural pathways.
Area of Science:
- Endocrinology
- Gastroenterology
- Neuroscience
Background:
- Alterations in gastric emptying are increasingly recognized in diabetes mellitus.
- Factors like meal volume, fat content, and glucose levels influence gastric emptying.
- The pancreatic islet hormone amylin is implicated in regulating gastric emptying.
Purpose of the Study:
- To investigate the effect of amylin and its analogue pramlintide on gastric emptying.
- To explore the potential neural mechanisms underlying amylin-induced slowing of gastric emptying.
Main Methods:
- Studies in spontaneously diabetic BB/Wistar rats.
- Intravenous infusion of the human amylin analogue pramlintide in patients with Type 1 diabetes.
Main Results:
- Administration of amylin slowed gastric emptying in diabetic rats.
- Pramlintide infusion slowed gastric emptying in Type 1 diabetic patients.
- Animal studies suggest amylin may affect parasympathetic input to the stomach via brainstem neurons.
Conclusions:
- Amylin and pramlintide demonstrably slow gastric emptying in diabetes models and patients.
- The mechanism may involve modulation of vagal nerve activity through central neural pathways.
- Further research is needed to elucidate the precise neurobiological mechanisms.