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PbB and ALAD in mentally retarded and normal children
International Archives of Occupational and Environmental Health
|January 1, 1983
Summary
Mentally retarded children showed lower erythrocyte delta-aminolevulinic acid dehydratase (ALAD) activity compared to normal children, despite similar blood lead (PbB) levels. Both groups had acceptable lead exposure levels.
Area of Science:
- Environmental Health
- Neuroscience
- Toxicology
Background:
- Lead (Pb) exposure is a significant public health concern, particularly for children's neurodevelopment.
- Erythrocyte delta-aminolevulinic acid dehydratase (ALAD) is a sensitive biomarker of lead exposure and its biological effects.
- Understanding the relationship between lead levels, ALAD activity, and cognitive function is crucial for identifying at-risk populations.
Purpose of the Study:
- To compare blood lead (PbB) levels and erythrocyte ALAD activity between mentally retarded children and a control group of normal children.
- To investigate potential correlations between lead exposure biomarkers and cognitive status in children.
- To assess whether lead exposure levels in the studied groups fall within acceptable ranges.
Main Methods:
- Blood lead (PbB) levels and erythrocyte ALAD activity were measured in two groups of children: 50 mentally retarded children (Group A) and 50 normal children (Group B).
- Participants were from institutions in Zagreb, with details on age, sex, and duration of institutionalization recorded.
- PbB levels were measured in micrograms per liter (µg/l), and ALAD activity in European units.
Main Results:
- Both groups exhibited very similar distributions of blood lead (PbB) levels.
- Mentally retarded children (Group A) showed a significantly different distribution of ALAD activity, favoring lower enzyme activity compared to the normal children (Group B).
- PbB and ALAD levels in both groups were within the currently accepted normal ranges.
Conclusions:
- Despite comparable blood lead levels, mentally retarded children displayed reduced ALAD activity, suggesting potential differences in lead's biological impact or other contributing factors.
- The findings indicate that even within acceptable lead exposure ranges, variations in ALAD activity may be associated with cognitive impairments.
- Further research is warranted to elucidate the complex interplay between lead exposure, ALAD function, and neurodevelopmental outcomes.