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Effects of human growth hormone on erythrocyte insulin binding in growth hormone deficient children
Insights
Human growth hormone (GH) administration impacts erythrocyte insulin binding in children with GH deficiency. GH influences insulin receptor numbers indirectly via metabolic changes, affecting insulin sensitivity.
Area of Science:
- Endocrinology
- Metabolic Research
- Pediatric Endocrinology
Background:
- Growth hormone (GH) plays a crucial role in metabolic regulation.
- Insulin resistance is a concern in endocrine disorders.
- Understanding GH's effect on insulin sensitivity is vital for pediatric care.
Purpose of the Study:
- To investigate the acute effects of human growth hormone (GH) administration on erythrocyte insulin binding in children with GH deficiency.
- To explore the relationship between GH levels, metabolic markers, and insulin receptor dynamics.
Main Methods:
- Acute administration of human growth hormone (GH) at 0.25 U/kg to GH-deficient children (N=6).
- Monitoring of blood GH levels, somatomedin activity, free fatty acid (FFA), urea, and blood glucose.
- Assessment of 125I-insulin binding to erythrocytes using Scatchard analysis to determine receptor number and affinity.
Main Results:
- GH levels peaked at 4-8 hours and normalized by 24 hours post-injection.
- Changes in somatomedin activity, FFA, urea, blood glucose, and erythrocyte insulin binding were observed around 24 hours.
- A significant inverse correlation was found between maximum insulin binding (IBmax) and FFA levels (P<0.02).
- Scatchard analysis indicated that the reduction in IBmax was primarily due to a decrease in the number of insulin receptors.
Conclusions:
- Acute GH administration may indirectly influence erythrocyte insulin binding in GH-deficient children.
- Metabolic alterations resulting from hormonal changes appear to mediate GH's effect on insulin receptor dynamics.
- Further research is needed to elucidate the precise mechanisms linking GH, metabolic changes, and insulin sensitivity.
Abstract:
In this paper, the effect of acute human growth hormone (GH) administration on erythrocyte insulin binding in GH deficient children (N = 6) was studied. Following GH (0.25 U/kg) administration, the blood levels of GH peaked within 4 to 8 h and returned to basal levels 24 h later. However, the changes in somatomedin activity, free fatty acid (FFA), urea, blood glucose and 125I-insulin binding to erythrocyte were observed around 24 h following the injection, and there was a converse relationship between maximum percent 125I-insulin binding (IBmax) and FFA (P less than 0.02). By Scatchard analysis it was found that the decrease in IBmax is mainly due to the change in the number of insulin receptors. These results suggest that GH may possibly affect the insulin binding to erythrocyte indirectly through metabolic changes as a result of hormonal changes in GH deficient children.