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Determinants of polychlorinated biphenyl levels in plasma from 42-month-old children
C I Lanting1, V Fidler, M Huisman
1Department of Obstetrics and Gynaecology, Perinatal Nutrition and Development Unit, Faculty of Medicine, University Hospital Groningen, P.O. Box 30.001, 9700 RB, Groningen, The Netherlands.
Insights
Breastfeeding significantly increases polychlorinated biphenyl (PCB) levels in children by age 42 months. Higher PCB concentrations in breast milk and longer lactation duration are key factors determining children's PCB body burden.
Area of Science:
- Environmental Health
- Pediatrics
- Toxicology
Background:
- Polychlorinated biphenyls (PCBs) are persistent organic pollutants with potential health implications.
- Understanding exposure pathways in early childhood is crucial for public health.
- Lactation is a primary route for postnatal exposure to environmental contaminants.
Purpose of the Study:
- To investigate polychlorinated biphenyl (PCB) levels in 42-month-old children.
- To identify factors determining PCB levels, focusing on prenatal and postnatal exposure.
- To assess the impact of breastfeeding on PCB body burden in early childhood.
Main Methods:
- Measured PCB congeners (118, 138, 153, 180) in cord plasma, breast milk, and child plasma at 42 months.
- Calculated sum of PCB levels (SigmaPCB) for prenatal (cord plasma) and postnatal (breast milk) exposure.
- Recorded maternal factors and duration of lactation for 126 children in the Groningen area, Netherlands.
Main Results:
- Median SigmaPCB in 42-month-old fully breast-fed children was 4.5 times higher than in formula-fed children.
- PCB levels in cord blood, breast milk, and duration of breastfeeding significantly predicted plasma PCB levels at 42 months.
- Each additional week of full breastfeeding increased milk PCB levels by an estimated 0.3%.
Conclusions:
- Lactation is a major determinant of a child's PCB body burden by 42 months of age.
- Breastfeeding duration and milk PCB concentrations are critical factors influencing long-term PCB exposure.
- Prenatal exposure via cord plasma also contributes to the overall PCB body burden in young children.
Abstract:
We report on the PCB levels in plasma from 42-month-old children and the factors that determine these levels. We measured the levels of the PCB congeners 118 (2,4,5-3'4' pentachlorobiphenyl (CB)), 138 (2, 3,4-2'4'5'hexaCB), 153 (2,4,5-2'4'5'hexaCB), and 180 (2,3,4, 5-2'4'5'heptaCB) in cord plasma, breast milk, and plasma from 42-month-old children (n = 126) living in the Groningen area, The Netherlands. The sum of the levels of these four congeners was calculated for cord plasma (SigmaPCBcord), breast milk (SigmaPCBmilk), and 42-month plasma (SigmaPCB42mo). SigmaPCBcord was used as a measure of prenatal exposure. Postnatal exposure was assessed in terms of the SigmaPCBmilk and the duration of lactation. In addition, maternal factors including age, body weight and height, parity, and formal education were recorded. In 42-month-old children who have been fully breast-fed for at least six weeks as babies, the median SigmaPCB42mo was 4.5 times as high as that in formula-fed children (0.81 microg/L vs. 0.18 microg/L). The PCB levels in cord blood and human milk and the duration of breast-feeding predict the plasma PCB level at 42 months. Each additional week of full breast-feeding is estimated to result in an increase of 0.3% of the milk PCB level. We concluded that lactation is a major source for the child's PCB body burden at 42 months.