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Immunologic effects of background prenatal and postnatal exposure to dioxins and polychlorinated biphenyls in Dutch
N Weisglas-Kuperus1, T C Sas, C Koopman-Esseboom
1Department of Pediatrics, Erasmus University, Rotterdam, The Netherlands.
Insights
This study found no link between infant exposure to polychlorinated biphenyls (PCBs) and dioxins and respiratory illnesses or antibody levels. PCB/dioxin exposure did not impact infant immune responses or health outcomes.
Area of Science:
- Environmental Health
- Immunology
- Pediatrics
Background:
- Polychlorinated biphenyls (PCBs) and dioxins are environmental contaminants with potential health effects.
- Infant exposure can occur prenatally and postnatally through maternal blood and breast milk.
- Understanding immunologic effects is crucial for assessing infant health risks.
Purpose of the Study:
- To explore the immunologic effects of pre- and postnatal PCB/dioxin exposure in Dutch infants.
- To investigate the relationship between PCB/dioxin exposure and respiratory tract infections.
- To assess humoral immunity and immune cell profiles in relation to environmental exposures.
Main Methods:
- Study included 207 mother-infant pairs, with exposure assessed via maternal blood and human milk.
- Infant health status evaluated by respiratory illness frequency (rhinitis, bronchitis, etc.).
- Humoral immunity (antibody levels) and immune cell markers (lymphocytes, NK cells) analyzed in cord and venous blood.
Main Results:
- No significant relationship was observed between prenatal or postnatal PCB/dioxin exposure and respiratory symptoms.
- Humoral antibody production against mumps, measles, and rubella was not associated with exposure levels.
- Immune cell counts and marker analyses did not reveal correlations with PCB/dioxin exposure.
Conclusions:
- Pre- and postnatal exposure to PCBs and dioxins did not appear to affect immune responses in Dutch infants.
- The study found no association between these exposures and common respiratory illnesses or antibody development.
- Further research may be needed to explore other potential health impacts or different exposure scenarios.
Abstract:
Immunologic effects of pre- and postnatal polychlorinated biphenyl (PCB)/dioxin exposure in Dutch infants from birth to 18 mo of age are explored. The total study group consisted of 207 healthy mother-infant pairs, of which 105 infants were breast-fed and 102 children were bottle-fed. Prenatal PCB exposure was estimated by the PCB sum (PCB congeners 118, 138, 153, and 180) in maternal blood and the total toxic equivalent (TEQ) level in human milk (17 dioxin and 8 dioxin-like PCB congeners). Postnatal PCB/dioxin exposure was calculated as a product of the total TEQ level in human milk multiplied by the weeks of breast-feeding. The number of periods with rhinitis, bronchitis, tonsillitis, and otitis during the first 18 mo of life was used as an estimate of the health status of the infants. Humoral immunity was measured at 18 mo of age by detecting antibody levels to mumps, measles, and rubella. White blood cell counts (monocytes, granulocytes, and lymphocytes) and immunologic marker analyses CD4+ T-lymphocytes, CD8+ T-lymphocytes, activated T-lymphocytes (HLA-DR+CD3+), as well as T cell receptor (TcR) alpha beta+, TcR gamma delta+, CD4+CD45RA+ and CD4+CD45RO+ T-lymphocytes, B-lymphocytes (CD19+ and/or CD20+) and NK cells (CD16+ and/or CD56+/CD3-) in cord blood and venous blood at 3 and 18 mo of age were assessed in a subgroup of 55 infants. There was no relationship between pre- and postnatal PCB/dioxin exposure and upper or lower respiratory tract symptoms or humoral antibody production.(ABSTRACT TRUNCATED AT 250 WORDS)