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Hyperproinsulinaemia in patients with myotonic dystrophy
1Diabetic Clinic, General Hospital, Birmingham, UK.
Diabetologia
|December 1, 1992
Summary
Patients with myotonic dystrophy exhibit hyperinsulinaemia due to increased beta-cell secretion, indicated by elevated proinsulin levels. This suggests a compensatory response to insulin resistance in this genetic disorder.
Area of Science:
- Endocrinology
- Genetics
- Metabolic Disorders
Background:
- Hyperinsulinaemia is a known feature of myotonic dystrophy.
- This is often attributed to beta-cell compensation for insulin resistance.
Purpose of the Study:
- To investigate circulating insulin, proinsulin, and split proinsulin levels in myotonic dystrophy patients.
- To compare these levels with healthy controls and assess beta-cell function.
Main Methods:
- Fasting blood samples were analyzed from 10 myotonic dystrophy patients and 10 controls.
- Hormone concentrations (insulin, proinsulin, C-peptide) were measured using immunoradiometric assays and radioimmunoassay.
- Oral glucose tolerance tests were performed.
Main Results:
- Myotonic dystrophy patients showed significantly higher fasting proinsulin and split proinsulin levels.
- The fasting proinsulin:insulin ratio was significantly increased in patients.
- A greater C-peptide response to glucose challenge was observed in patients, indicating increased beta-cell secretion.
Conclusions:
- Results support increased beta-cell secretion in myotonic dystrophy.
- Elevated proinsulin suggests altered insulin processing or secretion in these patients.