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Somatomedin in growth disorders and chronic renal insufficiency in children
Insights
Somatomedin activity levels in children vary with age and medical conditions. Growth hormone deficiency lowers somatomedin, while sexual precocity increases it, impacting growth velocity and bone age.
Area of Science:
- Pediatric Endocrinology
- Growth Factor Research
- Renal Physiology
Background:
- Somatomedins are crucial growth factors influenced by growth hormone.
- Understanding somatomedin activity is key to diagnosing growth disorders.
- Chronic renal insufficiency can affect growth and hormone regulation.
Purpose of the Study:
- To measure somatomedin activity in diverse pediatric groups.
- To correlate somatomedin activity with age, bone age, and growth velocity.
- To investigate the impact of growth hormone deficiency, sexual precocity, and renal insufficiency on somatomedin levels.
Main Methods:
- Utilized an embryonic chick cartilage assay for somatomedin activity measurement.
- Assessed children with normal growth, growth hormone deficiency, sexual precocity, and chronic renal insufficiency.
- Correlated somatomedin activity with chronological age, bone age, growth velocity, and glomerular filtration rate.
Main Results:
- Normal children showed age-dependent somatomedin activity, peaking at puberty.
- Growth hormone deficiency was associated with significantly lower somatomedin activity.
- Sexual precocity correlated with significantly higher somatomedin activity.
- Somatomedin activity correlated with bone age across all groups.
- In chronic renal insufficiency, decreasing somatomedin activity linked to reduced growth velocity and falling glomerular filtration rate.
Conclusions:
- Somatomedin activity is a reliable indicator of growth status in children.
- Growth hormone status and pubertal development significantly modulate somatomedin levels.
- Chronic renal insufficiency impairs somatomedin production, affecting growth and kidney function.
Abstract:
Somatomedin activity was measured using an embryonic chick cartilage assay in 33 normal and short normal children, 23 children with pituitary growth hormone (GH) deficiency, 14 children with sexual precocity, and 13 children with chronic renal insufficiency. In normal children somatomedin activity correlated well with chronological age: low valles in early childhood rose to higher than adult levels at puberty. Children with GH deficiency had significantly lower activities and those with sexual precocity significantly higher activities than normal children. In all three groups somatomedin activity correlated well with bone age. In children with chornic renal insufficiency there was a significant correlation between decreasing somatomedin activity and both a reduced growth velocity and a falling glomerular filtration rate. Somatomedin activity and growth velocity were within normal limits in children with glomerular filtration rates above 30 ml/min/1-73 m2.