Effect of Glucagon on Fasting Insulin Secretion and Glucose Metabolism in Subjects Without Type 2 Diabetes
Mayo Clinic
Summary
Fasting hyperglycemia contributes disproportionately to nonenzymatic glycosylation and the microvascular complications of type 2 diabetes. However, little is known about the regulation of glucose concentrations in the fasting state relative to what is known about the postprandial state. The proposed experiment is part of a series of experiments designed to establish how glucagon and insulin interact with their receptors to control fasting glucose in health and in prediabetes.
Description
The interaction between α-cell and β-cell function to regulate fasting glucose is incompletely understood. This is an important gap in our knowledge as fasting glucose contributes disproportionately to HbA1c and the microvascular complications of type 2 diabetes (T2DM). The regulation of fasting glucose in health and disease is relatively understudied. Insulin and glucagon should regulate glucose reciprocally through direct interaction; insulin restrains α-cell secretion while glucagon directly stimulates β-cell secretion. In addition, there are indirect interactions via changes in glucose. G…
Eligibility
- Age range
- 25–65 years
- Sex
- All
- Healthy volunteers
- Yes
Inclusion Criteria: * Individuals with normal or impaired fasting glucose and normal or impaired glucose tolerance Exclusion Criteria: * HbA1c less than 6.5% * Use of any glucose-lowering agents including metformin or sulfonylureas. * For female subjects: positive pregnancy test at the time of enrollment or study * History of prior upper abdominal surgery such as adjustable gastric banding, pyloroplasty and vagotomy. * Active systemic illness or malignancy. * Symptomatic macrovascular or microvascular disease.
Interventions
- OtherGlucagon
a variable rate glucagon infusion
- OtherGlucose
a variable rate glucose infusion
Location
- Mayo Clinic in RochesterRochester, Minnesota