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Insulin binding to erythrocytes in children with type-I diabetes mellitus
Insights
Insulin receptor affinity and concentration in children
Area of Science:
- Endocrinology
- Pediatrics
- Biochemistry
Background:
- Insulin resistance is a key feature of diabetes.
- Understanding insulin receptor dynamics in children is crucial for diabetes management.
- Erythrocytes offer a model for studying insulin binding in vivo.
Purpose of the Study:
- To investigate specific [125I]insulin binding to erythrocytes in healthy and diabetic children.
- To analyze differences in insulin receptor affinity (Ka) and concentration (X0) based on age and diabetes duration.
- To determine how diabetes duration impacts insulin receptor parameters.
Main Methods:
- Isolated erythrocytes from four groups of children (healthy and diabetic, <10 and >10 years) were used.
- [125I]insulin binding assays were performed.
- Nonlinear regression analysis and variance analysis were employed to determine binding parameters (Ka, X0).
Main Results:
- Statistically significant differences in receptor affinity and concentration were found between healthy and diabetic children, and between different age groups of diabetics.
- Diabetic children exhibited higher receptor affinities and lower receptor concentrations compared to healthy children.
- A significant increase in receptor concentration and decrease in affinity were observed within the first two years of diabetes onset.
Conclusions:
- Age and diabetes status significantly influence insulin receptor characteristics in children's erythrocytes.
- Early stages of diabetes (first 2 years) show distinct changes in insulin receptor affinity and concentration.
- These findings highlight potential mechanisms of insulin resistance in pediatric diabetes.
Abstract:
Specific binding of [125I]insulin to isolated erythrocytes was investigated in four groups of children (A) Healthy children under 10 years of age (n = 20) (B) Healthy children over 10 years of age (n = 13) (C) Diabetic children under 10 years of age (n = 12) (D) Diabetic children over 10 years of age (n = 63). In addition, all diabetic children (n = 75) were subdivided into four groups according to the duration of diabetes. (E) less than 2 years, (F) 2--4 years, (G) 4--6 years, and (H) greater than 6 years. By means of a nonlinear regression analysis for the extraction of binding parameters (assuming a single receptor class model with independent receptor sites) and methods of variance analysis, statistically significant differences were observed for the receptor affinities Ka (10(8) l/mol) and the receptor concentrations X0 (nmol/l) between groups A and C, B and D, C and D, but not between A and B. The affinities of groups C and D were found to be higher than the corresponding values of groups A and B, whereas the receptor concentrations exhibited an inverse behaviour. A significant increase of the receptor concentration and decrease of the receptor affinity depending on the duration of diabetes could only be proved to exist during the first 2 years of the disease.