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Somatomedin activity before and after chelation therapy in lead-intoxicated children
Insights
Lead intoxication in children is linked to higher somatomedin activity, a growth factor. This elevated activity may explain why lead poisoning (plumbism) doesn't typically harm statural bone growth.
Area of Science:
- Pediatric Endocrinology
- Environmental Health
Background:
- Lead poisoning (plumbism) is a significant environmental health concern in children.
- The impact of lead intoxication on statural (bone) growth has been a subject of clinical observation.
Purpose of the Study:
- To investigate the relationship between lead intoxication and somatomedin activity in children.
- To determine if lead exposure affects growth-related hormonal processes.
Main Methods:
- Somatomedin activity was measured in 21 lead-intoxicated children using both rabbit coastal cartilage bioassay and radioimmunoassay for somatomedin-C.
- Measurements were taken before and after chelation therapy (EDTA or BAL + EDTA).
Main Results:
- Lead-intoxicated children exhibited significantly increased somatomedin activity compared to normal children.
- Chelation therapy further increased somatomedin activity in these children.
- Blood lead levels decreased significantly following chelation therapy.
Conclusions:
- Plumbism is associated with elevated somatomedin activity in children.
- Increased somatomedin activity may mitigate potential long-term negative effects of lead exposure on statural growth.
- The mechanisms driving increased somatomedin activity in lead-intoxicated children require further investigation.
Abstract:
Somatomedin activity was measured in 21 lead-intoxicated children to determine whether plumbism interferes with the processes of statural (bone) growth. Somatomedin activity was measured both by the rabbit coastal cartilage bioassay and by radioimmunoassay of somatomedin-C. Compared to values in normal children, both the bioassay and radioimmunoassay somatomedin activity was increased. The degree of body lead burden was so extensive that the 21 study children required chelation therapy. Following EDTA or BAL + EDTA chelation therapy, the overall somatomedin activity of these children with plumbism further increased significantly. In contrast, measures of body lead burden--including blood lead levels--decreased after treatment in all lead-intoxicated youngsters. We conclude that plumbism is associated with increased somatomedin activity. Hence the increased somatomedin activity may explain why clinical experience fails to find any long-term deleterious effect of saturnism on statural (bone) growth. Possible mechanisms underlying the increased somatomedin activity in the lead-intoxicated children remain to be defined.