PCB-induced neurodevelopmental toxicity in human infants and its potential mediation by endocrine dysfunction
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Updated: Sep 28, 2026
Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants
Published on: March 6, 2018
Gerhard Winneke1, Jens Walkowiak, Hellmuth Lilienthal
1Division of Neurobehavioral Toxicology, Medical Institute of Environmental Hygiene, Heinrich-Heine-University Düsseldorf, Auf'm Hennekamp 50, D-40225 Dusseldorf, Germany. gerhard.winneke@uni-dusseldorf.de
Insights
Polychlorinated biphenyls (PCBs) transfer to fetuses and infants, potentially causing developmental neurotoxicity. While human studies show associations, experimental data support PCBs as neurotoxicants, possibly via endocrine disruption.
Area of Science:
- Environmental Health
- Toxicology
- Neuroscience
- Endocrinology
Background:
- Polychlorinated biphenyls (PCBs) are persistent environmental pollutants.
- PCBs readily cross the placenta and are transferred through breast milk, exposing developing fetuses and infants.
- Endocrine disruption and developmental neurotoxicity are key concerns associated with PCB exposure.
Purpose of the Study:
- To review evidence on the neurodevelopmental effects of early life exposure to Polychlorinated biphenyls (PCBs).
- To explore potential mechanisms underlying PCB-induced developmental neurotoxicity, focusing on endocrine interactions.
Main Methods:
- Review of existing human cohort studies examining associations between prenatal/postnatal PCB exposure and neurodevelopmental outcomes.
- Evaluation of experimental findings providing evidence for PCB developmental neurotoxicity.
- Analysis of proposed mechanisms, including interactions with estrogen/androgen and thyroid hormone systems.
Main Results:
- Several cohort studies report associations between early developmental PCB exposure and neurodevelopmental delays.
- Discrepancies exist among studies regarding confounding factors, PCB mixtures, and effect persistence.
- Experimental data support the developmental neurotoxicity of PCBs, though human causality remains debated.
Conclusions:
- While definitive proof from human studies is pending, experimental evidence strongly suggests PCBs are developmental neurotoxicants.
- Interactions with endocrine systems, particularly thyroid hormones, are a plausible mechanism for PCB-induced neurodevelopmental adversity.
- Further research is needed to elucidate the precise mechanisms and confirm causality in human populations.
Abstract:
Polychlorinated biphenyls (PCBs) cross the placenta and expose the fetus to the body burden of the mother. Additionally, the breastfed baby is postnatally exposed to PCBs in maternal milk. Among the broad spectrum of biological effects interaction with endocrine systems and developmental neurotoxicity are prominent features of these chemical mixtures. Associations between neurodevelopmental delay and prenatal or early postnatal PCB-exposure at environmental levels have been reported in several cohort studies. Adverse effects were found to be associated with early developmental PCB-exposure, although there are discrepancies between studies in terms of confounding, effective PCB-matrix, as well as spectrum and persistence of effects. From these cohort studies alone the causative role of PCBs in producing neurodevelopmental adversity still cannot be considered proven, but experimental findings do provide evidence for the developmental neurotoxicity of PCBs. The underlying mechanisms of this action is still unknown. However, interaction with endocrine systems, namely the estrogen/androgen and, particularly, the thyroid hormone systems are discussed as a possible explanation for PCB-induced neurodevelopmental adversity. Some evidence in this respect is being reviewed.
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