Neurobehavioral effects of prenatal exposure to methylmercury and PCBs, and seafood intake: Neonatal behavioral assessment scale results of Tohoku study of child development

Keita Suzuki, Kunihiko Nakai, Tomoko Sugawara, Tomoyuki Nakamura, Takashi Ohba, Miyuki Shimada, Toru Hosokawa, Kunihiro Okamura, Takeo Sakai, Naoyuki Kurokawa, Katsuyuki Murata, Chieko Satoh, Hiroshi Satoh

Research output: Contribution to journalArticlepeer-review

84 Citations (Scopus)

Abstract

As factors affecting neonatal neurodevelopment, methylmercury, polychlorinated biphenyls (PCBs), and maternal seafood intake reflecting n-3 polyunsaturated fatty acids (PUFAs) are believed to have adverse or beneficial effects, but there are a few reports addressing such factors simultaneously. We carried out a birth cohort study to clarify the effects of these three factors on the Neonatal Behavioral Assessment Scale (NBAS), administered 3 days after birth. In a total of 498 mother-neonate pairs, the total mercury level (median, 1.96μg/g) in maternal hair at parturition and the σPCB level (45.5. ng/g-lipid) in cord blood were analyzed, and maternal seafood intake was estimated using a semi-quantitative food frequency questionnaire. A negative relationship between the hair mercury level and the motor cluster of NBAS was observed, even after adjusting for PCBs, maternal seafood intake, and possible confounders such as maternal age, birth weight, and parity. The σPCB level was negatively correlated with the motor cluster, but this association was attenuated after adjusting for mercury and the confounders. There was seen to be a positive association between maternal seafood intake and the motor cluster when considering the effects of mercury and PCBs. In conclusion, our data suggest that prenatal exposure to methylmercury adversely affects neonatal neurobehavioral function; in contrast, maternal seafood intake appears to be beneficial. The neurobehavioral effect of prenatal exposure to PCBs remains unclear in our study. Further research is necessary to elucidate interactive effects of methylmercury, PCBs, and n-3 PUFAs, originating from fish, on child neurodevelopment.

Original languageEnglish
Pages (from-to)699-704
Number of pages6
JournalEnvironmental Research
Volume110
Issue number7
DOIs
Publication statusPublished - 2010 Oct

Keywords

  • Maternal seafood intake
  • Methylmercury
  • Neonatal Behavioral Assessment Scale (NBAS)
  • Neonates
  • Neurobehavioral function
  • Polychlorinated biphenyls (PCBs)

ASJC Scopus subject areas

  • Biochemistry
  • Environmental Science(all)

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