Impact of prenatal exposure to cadmium on cognitive development at preschool age and the importance of selenium and iodine

Maria Kippler, Matteo Bottai, Vaggelis Georgiou, Katerina Koutra, Georgia Chalkiadaki, Mariza Kampouri, Andriani Kyriklaki, Marina Vafeiadi, Eleni Fthenou, Maria Vassilaki, Manolis Kogevinas, Marie Vahter, Leda Chatzi

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

The evidence regarding a potential link of low-to-moderate iodine deficiency, selenium status, and cadmium exposure during pregnancy with neurodevelopment is either contradicting or limited. We aimed to assess the prenatal impact of cadmium, selenium, and iodine on children’s neurodevelopment at 4 years of age. The study included 575 mother–child pairs from the prospective “Rhea” cohort on Crete, Greece. Exposure to cadmium, selenium and iodine was assessed by concentrations in the mother’s urine during pregnancy (median 13 weeks), measured by ICPMS. The McCarthy Scales of Children’s Abilities was used to assess children’s general cognitive score and seven different sub-scales. In multivariable-adjusted regression analysis, elevated urinary cadmium concentrations (≥0.8 µg/L) were inversely associated with children’s general cognitive score [mean change: −6.1 points (95 % CI −12; −0.33) per doubling of urinary cadmium; corresponding to ~0.4 SD]. Stratifying by smoking status (p for interaction 0.014), the association was restricted to smokers. Urinary selenium was positively associated with children’s general cognitive score [mean change: 2.2 points (95 % CI −0.38; 4.8) per doubling of urinary selenium; ~0.1 SD], although the association was not statistically significant. Urinary iodine (median 172 µg/L) was not associated with children’s general cognitive score. In conclusion, elevated cadmium exposure in pregnancy of smoking women was inversely associated with the children’s cognitive function at pre-school age. The results indicate that cadmium may adversely affect neurodevelopment at doses commonly found in smokers, or that there is an interaction with other toxicants in tobacco smoke. Additionally, possible residual confounding cannot be ruled out.

Original languageEnglish (US)
Pages (from-to)1123-1134
Number of pages12
JournalEuropean Journal of Epidemiology
Volume31
Issue number11
DOIs
StatePublished - Nov 1 2016

Keywords

  • Cadmium
  • Cognitive development
  • Iodine
  • Prenatal exposure
  • Selenium
  • Urine

ASJC Scopus subject areas

  • Epidemiology

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