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Possible impact of phthalates on infant reproductive health

G Lottrup1, A-M Andersson, H Leffers

  • 1University Department of Growth and Reproduction, Rigshospitalet, Copenhagen, Denmark.

International Journal of Andrology
|February 10, 2006
PubMed

Insights

Perinatal exposure to phthalates may harm infant male reproductive development. Studies link phthalate exposure to altered hormone levels and reduced anogenital index in boys, suggesting potential anti-androgenic effects.

Area of Science:

  • Reproductive Toxicology
  • Environmental Health
  • Pediatric Endocrinology

Background:

  • Phthalates are industrial chemicals with known adverse effects on the male reproductive system in animal models, particularly following in utero exposure.
  • Limited data exists on the human health effects of phthalates, especially concerning perinatal exposure and its impact on male infants.
  • Animal studies indicate severe reproductive system disruption from phthalates, but human susceptibility and specific effects remain less understood.

Purpose of the Study:

  • To investigate the potential adverse effects of perinatal phthalate exposure on human male reproductive development.
  • To examine the association between phthalate metabolites in breast milk and maternal urine with reproductive hormone levels and genital development in infant boys.
  • To assess the potential anti-androgenic effects of phthalates in human infants.

Main Methods:

  • Analysis of phthalate monoesters in breast milk samples and correlation with reproductive hormone levels (testosterone, SHBG, LH) in healthy infant boys.
  • Measurement of phthalate metabolites in maternal urine samples collected during late pregnancy and correlation with the anogenital index (AGI) in infant boys.
  • Comparison of findings with established animal toxicology data on phthalate exposure.

Main Results:

  • Five phthalates (MEP, MBP, MMP, MEHP, MiNP) correlated with altered hormone levels in infant boys, indicating reduced androgen activity and Leydig cell function.
  • Elevated levels of MEP and MBP were associated with increased sex hormone-binding globulin (SHBG) and LH/testosterone ratios.
  • Increased maternal urinary levels of MBP, MEP, monobenzyl-, and mono-isobutyl phthalate were linked to a reduced anogenital index (AGI) in infant boys, associated with cryptorchidism and smaller genital size.

Conclusions:

  • Perinatal phthalate exposure is associated with anti-androgenic effects in human infants, mirroring some animal study findings.
  • Specific phthalates like MEP may have effects predominantly observed in humans, possibly due to unique exposure routes or metabolism.
  • These findings raise significant concerns regarding the safety of phthalate exposure for pregnant women and infants due to widespread production and use.

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