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C-peptide response to arginine stimulation in diabetic children
Insights
Residual beta cell function in children with diabetes is linked to disease stage. Children in remission show preserved C-peptide levels, unlike those at onset or not in remission.
Area of Science:
- Pediatric Endocrinology
- Metabolic Disorders
- Diabetes Mellitus Research
Background:
- Residual beta cell function is crucial in managing type 1 diabetes.
- Assessing C-peptide levels provides insight into endogenous insulin production.
- Understanding beta cell function in pediatric diabetes is key for treatment strategies.
Purpose of the Study:
- To evaluate the extent and clinical significance of residual beta cell function in diabetic children.
- To correlate C-peptide levels with disease stage, age at onset, and insulin requirements.
Main Methods:
- Radioimmunoassay of C-peptide levels in 41 diabetic children.
- Utilized an arginine tolerance test to stimulate C-peptide release.
- Compared C-peptide levels in diabetic children across different disease stages with healthy controls.
Main Results:
- Diabetic children at disease onset or not in remission showed no C-peptide increment after arginine, with significantly lower basal values than controls.
- Children in the remission phase exhibited basal and peak C-peptide values not significantly different from controls.
- A positive correlation existed between peak C-peptide levels and age at diabetes onset; a negative correlation was found between disease duration and insulin requirement.
Conclusions:
- Residual beta cell function, indicated by C-peptide levels, is significantly diminished in diabetic children not in remission.
- Preserved beta cell function during remission is associated with better glycemic control indicators.
- C-peptide assessment via arginine tolerance test is valuable for staging pediatric diabetes and predicting insulin needs.
Abstract:
The extent and the clinical significance of residual beta cell function has been evaluated by radioimmunoassay of C-peptide in 41 diabetic children in different stages of evolution, using an arginine tolerance test. In control subjects a significant rise of C-peptide levels occurred after the infusion with arginine. In patients at the onset of the disease and in patients not in the remission stage, C-peptide levels showed no increment and basal values were significantly lower than in healthy control children. Children during the remission phase showed basal and peak values not significantly different from controls. A positive correlation was found between highest CPR levels compared to basal CPR values and to the age at onset of diabetes; a negative correlation was found between the duration of the disease and insulin requirement.