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Gastrin release in obese Zucker rats
R A Pederson1, R V Campos, C B Chan
1Department of Physiology, University of British Columbia, Vancouver, Canada.
Regulatory Peptides
|February 1, 1989
Summary
Obese Zucker rats develop hypergastrinemia after weaning, with increased gastrin release from the stomach. This condition is linked to a higher number of gastrin-producing G-cells, not increased cholinergic activity.
Area of Science:
- Endocrinology
- Gastroenterology
- Obesity Research
Background:
- Obesity is associated with hormonal dysregulation.
- Gastrin plays a key role in gastric acid secretion and G-cell regulation.
Purpose of the Study:
- To investigate gastrin release and G-cell dynamics in obese Zucker rats.
- To determine the relationship between obesity, hypergastrinemia, and G-cell hyperplasia.
Main Methods:
- In vivo and in vitro studies using obese and lean Zucker rats.
- Measurement of plasma gastrin levels.
- Gastrin and somatostatin release from perfused stomachs.
- Morphological analysis of G-cells.
Main Results:
- Obese rats showed progressive hypergastrinemia with age, starting post-weaning.
- Increased basal and vagally stimulated gastrin release from perfused stomachs of obese rats.
- Elevated number of gastrin-containing G-cells in adult obese rats correlated with hypergastrinemia.
Conclusions:
- Obese Zucker rats exhibit age-dependent fasting hypergastrinemia.
- Hypergastrinemia is linked to increased antral G-cell numbers, independent of cholinergic drive.
- The obese Zucker rat serves as a model for studying obesity-related hypergastrinemia.