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[Factors contributing to interindividual variability to chemical toxicity]
Birgitte Lindeman1, Erik J Søderlund, Erik Dybing
1Divisjon for miljømedisin Nasjonalt folkehelseinstitutt Postboks 4404 Nydalen 0403 Oslo.
Summary
Understanding how age, gender, disease, and genetics affect chemical processing (toxicokinetics) and effects (toxicodynamics) is crucial for accurate risk assessment and explaining individual susceptibility.
Area of Science:
- Environmental Health
- Toxicology
- Pharmacogenetics
Context:
- Individual susceptibility to chemical toxicity varies significantly within populations.
- Factors such as age, gender, disease, and genetic makeup influence how the body processes and responds to chemical exposures.
- Understanding these variations is key for accurate risk assessment.
Purpose:
- To review the impact of age, gender, disease, and genetics on toxicokinetic and toxicodynamic processes.
- To highlight how these factors contribute to interindividual differences in chemical sensitivity and health risks.
Summary:
- Neonates exhibit reduced xenobiotic metabolism and elimination, increasing susceptibility to parent chemical toxicity during critical developmental periods.
- The elderly may show enhanced chemical sensitivity due to diminished organ function, disease, and polypharmacy, leading to increased adverse drug reactions.
- Genetic polymorphisms in biotransformation and toxicodynamic genes contribute to interindividual variability in chemical response, though their precise functional impact requires further investigation.
Impact:
- Provides a framework for understanding differential susceptibility to chemical agents.
- Emphasizes the need to consider individual variability in toxicological risk assessments.
- Highlights the importance of pharmacogenetics and personalized toxicology in public health and drug development.