Human exposure to endocrine-active chemicals: hazard assessment problems

Area of Science:

• Environmental toxicology
• Endocrinology
• Chemical risk assessment

Background:

• Industrial chemicals, known as endocrine-active chemicals (EACs), are linked to human diseases.
• Many characterized xeno-EACs interact with key hormone receptors like estrogen, aryl hydrocarbon, and androgen receptors.
• Assessing the health risks of EACs is challenging due to multiple factors.

Purpose of the Study:

• To highlight the complexities in hazard and risk assessment of endocrine-active chemicals (EACs).
• To identify critical knowledge gaps in understanding EACs' impact on human health.
• To emphasize the need for comprehensive data for accurate risk evaluation.

Main Methods:

• Review of existing scientific literature on endocrine-active chemicals (EACs).
• Analysis of factors complicating hazard and risk assessment.
• Identification of data requirements for scientific-based assessment.

Main Results:

• Human exposure to natural EACs often exceeds that of xeno-EACs.
• Limited understanding exists regarding EAC metabolism, binding proteins, and cellular uptake.
• EACs are encountered as mixtures, with potential for complex additive, antagonistic, or synergistic effects.
• Individual EACs can act as agonists/antagonists across multiple endocrine pathways.

Conclusions:

• Accurate hazard and risk assessment of natural and xeno-EACs requires further research.
• Key areas for investigation include dietary intake, target organ exposure, mechanisms of action, and mixture interactions.
• Enhanced scientific understanding is crucial for mitigating potential health impacts of EACs.