Related Experiment Videos
Changes in islet blood flow in rats with NIDDM
1Laboratoire de Physiopathologie de la Nutrition, CNRS URA 307, Université Paris VII, France.
Diabetologia
|July 1, 1994
Summary
This study reveals that diabetic rats exhibit altered islet blood flow, impacting insulin secretion. Vagotomy in GK rats normalized islet blood flow and insulin levels, suggesting a role for the vagus nerve.
Area of Science:
- Endocrinology and Metabolism
- Physiology
Background:
- Non-obese Diabetic (NOD) and Goto-Kakizaki (GK) rats are models for type 2 diabetes.
- Insulin secretion is tightly regulated by blood flow within the pancreatic islets.
Purpose of the Study:
- To investigate islet blood flow in two rat models of type 2 diabetes (GK and neonatal STZ-injected rats).
- To examine the impact of glucose challenge and vagotomy on islet blood flow and insulin levels.
Main Methods:
- Quantification of islet blood flow using the non-radioactive microsphere technique.
- Assessment of plasma insulin levels.
- Evaluation of effects of bilateral subdiaphragmatic vagotomy.
- Analysis during basal state and glucose challenge.
Main Results:
- A correlation between plasma insulin and islet blood flow was observed in basal conditions.
- GK rats showed increased islet blood flow and insulin, abolished by vagotomy.
- Diabetic rats did not exhibit increased islet blood flow or insulin during a glucose challenge, unlike controls.
Conclusions:
- Diabetic rats display impaired islet blood flow regulation during glucose challenge.
- Altered islet blood flow may contribute to abnormal glucose-induced insulin secretion in type 2 diabetes models.