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Study of A- and B-cell function in beta-thalassemia major
Acta Diabetologica Latina
|April 1, 1983
Summary
Patients with beta-thalassemia major receiving treatment show normal glucose tolerance and hepatic insulin clearance despite iron overload. Insulin response to oral glucose is lower than intravenous glucose, likely due to reduced gastrointestinal hormone secretion.
Area of Science:
- Endocrinology
- Hematology
- Metabolic Disorders
Background:
- Iron overload in beta-thalassemia major can affect hepatic and pancreatic function.
- Effective transfusion and chelation therapy are crucial for managing these patients.
Purpose of the Study:
- To investigate B-cell function and hepatic insulin clearance in beta-thalassemia major patients.
- To assess glucose, insulin, and C-peptide responses to oral and intravenous glucose challenges.
- To evaluate pancreatic A-cell function via arginine infusion.
Main Methods:
- Oral glucose tolerance test (OGTT) and intravenous glucose tolerance test (IVGTT) were performed.
- Arginine infusion test was used to assess pancreatic A-cell function.
- Measurements included blood glucose (BG), insulin (IRI), C-peptide (CPR), and glucagon (IRG).
Main Results:
- OGTT and IVGTT were normal in beta-thalassemia major patients.
- Lower plasma insulin and insulinogenic index observed after OGTT in thalassemics compared to controls.
- Normal insulin response and insulinogenic index after IVGTT, with similar CPR/IRI ratios and arginine test results.
Conclusions:
- Beta-thalassemia major patients on high transfusion and chelation therapy maintain normal glucose tolerance and hepatic insulin clearance.
- Diminished insulin response to oral glucose may be linked to reduced gastrointestinal hormone stimulation.
- Iron overload in the pancreas and liver does not necessarily impair glucose metabolism under optimal treatment.