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Infantile phthalate metabolism and toxico/pharmacokinetic implications within the first year of life

Liangpo Liu1, Heng Wang2, Xueyan Li3

  • 1School of Public Health, Shanxi Medical University, Taiyuan 030001, PR China; Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, PR China.

Environment International
|August 22, 2020
PubMed

Insights

Infants metabolize phthalates differently than adults, with detoxification pathways changing significantly during the first year of life. Understanding infant phthalate metabolism is key for assessing endocrine disruption risks.

Area of Science:

  • Environmental Health
  • Toxicology
  • Pediatrics

Background:

  • Infant phthalate metabolism is critical for assessing endocrine disruption risks.
  • Developmental differences in phthalate detoxification have significant toxicokinetic implications.

Purpose of the Study:

  • To characterize temporal variations in urinary phthalate metabolites (PMEs) in infants.
  • To investigate the relationship between infant growth and phthalate detoxification capacity.

Main Methods:

  • A cohort study involving 155 healthy Chinese infants from birth to one year.
  • Serial urine sample collection (n=876) at eight time points.
  • Measurement of free and total PMEs using LC/MS/MS, analyzed with ICCs and linear mixed models.

Main Results:

  • Most PME concentrations changed significantly over time (ICCs 0.213–0.318), with increasing trends (p<0.001).
  • MEHP showed fair reproducibility (ICC=0.480), and its oxidation pathways peaked between 3–8 months.
  • Glucuronidation increased significantly for most PMEs (p<0.001), but not for MMP or MEHP.

Conclusions:

  • Infants have less efficient phthalate metabolism than adults, particularly in the first six months.
  • Age-dependent phthalate metabolism is crucial for understanding infant development and health risk assessment.
  • Environmental biomonitoring requires consideration of these ontogeny-driven metabolic changes.
Abstract

Keywords:
Development stage specific clearanceInfantPhthalate exposureUrinary exposure biomarkersVariability

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