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Plasma C-peptide response to oral glucose load in hyperthyroidism
E Bonora1, V Manicardi, M Zenere
1Cattedra di Malattie del Metabolismo, Università di Verona, Italy.
Journal of Endocrinological Investigation
|July 1, 1990
Summary
Hyperthyroidism impairs pancreatic beta cell function, leading to reduced insulin response after glucose intake. This study highlights altered glucose metabolism in hyperthyroid patients compared to healthy individuals.
Area of Science:
- Endocrinology
- Metabolic research
- Diabetes research
Background:
- Hyperthyroidism is associated with various metabolic disturbances.
- The impact of hyperthyroidism on pancreatic beta cell function requires further elucidation.
Purpose of the Study:
- To assess pancreatic beta cell responsiveness to an oral glucose load in patients with hyperthyroidism.
- To compare glucose and C-peptide levels after oral glucose challenge between hyperthyroid patients and healthy controls.
Main Methods:
- Measured plasma glucose and C-peptide levels in 8 newly-diagnosed hyperthyroid patients and 8 healthy controls.
- Administered a 100g oral glucose load and recorded measurements at fasting and post-load intervals.
- Calculated incremental areas under the curve for glucose and C-peptide and their ratios.
Main Results:
- Hyperthyroid patients exhibited significantly higher plasma glucose levels post-glucose load compared to controls.
- A trend towards reduced plasma C-peptide concentrations was observed in hyperthyroid patients, though not statistically significant.
- The ratio of plasma C-peptide to plasma glucose incremental areas was significantly lower in hyperthyroid patients, indicating impaired beta cell function.
Conclusions:
- Hyperthyroidism is associated with a diminished pancreatic beta cell response to oral glucose stimulation.
- These findings suggest that thyroid hormone excess may directly or indirectly impair insulin secretion capacity.
- Further research is warranted to explore the mechanisms underlying beta cell dysfunction in hyperthyroidism and its clinical implications for glucose homeostasis.