Postnatal Exposure to Methyl Mercury from Fish Consumption: a Review and New Data from the Seychelles Child Development Study
Identifieur interne : 001143 ( Ncbi/Curation ); précédent : 001142; suivant : 001144Postnatal Exposure to Methyl Mercury from Fish Consumption: a Review and New Data from the Seychelles Child Development Study
Auteurs : Gary J. Myers ; Sally W. Thurston ; Alexander T. Pearson ; Philip W. Davidson ; Christopher Cox ; Conrad F. Shamlaye ; Elsa Cernichiari ; Thomas W. ClarksonSource :
- Neurotoxicology [ 0161-813X ] ; 2009.
Abstract
Fish is an important source of nutrition worldwide. Fish contain both the neurotoxin methyl mercury (MeHg) and nutrients important for brain development. The developing brain appears to be most sensitive to MeHg toxicity and mothers who consume fish during pregnancy expose their fetus prenatally. Although brain development is most dramatic during fetal life, it continues for years postnatally and additional exposure can occur when a mother breast feeds or the child consumes fish. This raises the possibility that MeHg might influence brain development after birth and thus adversely affect children’s developmental outcomes. We reviewed postnatal MeHg exposure and the associations that have been published to determine the issues associated with it and then carried out a series of analyses involving alternative metrics of postnatal MeHg exposure in the Seychelles Child Development Study (SCDS) Main Cohort.
The SCDS is a prospective longitudinal evaluation of prenatal MeHg exposure from fish consumption. The Main Cohort includes 779 subjects on whom recent postnatal exposure data were collected at the 6, 19, 29, 66, and 107 month evaluations. We examined the association of recent postnatal MeHg exposure with multiple 66 and 107-month outcomes and then used three types of alternative postnatal exposure metrics to examine their association with the children’s intelligence quotient (IQ) at 107 months of age.
Recent postnatal exposure at 107 months of age was adversely associated with four endpoints, three in females only. One alternative postnatal metric was beneficially associated with 9-year IQ in males only.
We found several associations between postnatal MeHg biomarkers and children’s developmental endpoints. However, as has been the case with prenatal MeHg exposure in the SCDS Main Cohort study, no consistent pattern of associations emerged to support a causal relationship.
Url:
DOI: 10.1016/j.neuro.2009.01.005
PubMed: 19442817
PubMed Central: 2743883
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Gary J. Myers<affiliation><nlm:aff id="A1"> Department of Neurology, University of Rochester School of Medicine and Dentistry</nlm:aff>
<wicri:noCountry code="subfield">University of Rochester School of Medicine and Dentistry</wicri:noCountry>
</affiliation>
<affiliation><nlm:aff id="A2"> Department of Pediatrics, University of Rochester School of Medicine and Dentistry</nlm:aff>
<wicri:noCountry code="subfield">University of Rochester School of Medicine and Dentistry</wicri:noCountry>
</affiliation>
<affiliation><nlm:aff id="A3"> Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry</nlm:aff>
<wicri:noCountry code="subfield">University of Rochester School of Medicine and Dentistry</wicri:noCountry>
</affiliation>
<affiliation><nlm:aff id="A2"> Department of Pediatrics, University of Rochester School of Medicine and Dentistry</nlm:aff>
<wicri:noCountry code="subfield">University of Rochester School of Medicine and Dentistry</wicri:noCountry>
</affiliation>
<affiliation><nlm:aff id="A3"> Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry</nlm:aff>
<wicri:noCountry code="subfield">University of Rochester School of Medicine and Dentistry</wicri:noCountry>
</affiliation>
<affiliation><nlm:aff id="A3"> Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry</nlm:aff>
<wicri:noCountry code="subfield">University of Rochester School of Medicine and Dentistry</wicri:noCountry>
</affiliation>
<affiliation><nlm:aff id="A4"> Department of Biostatistics and Computational Biology, University of Rochester School of Medicine and Dentistry</nlm:aff>
<wicri:noCountry code="subfield">University of Rochester School of Medicine and Dentistry</wicri:noCountry>
</affiliation>
<affiliation><nlm:aff id="A4"> Department of Biostatistics and Computational Biology, University of Rochester School of Medicine and Dentistry</nlm:aff>
<wicri:noCountry code="subfield">University of Rochester School of Medicine and Dentistry</wicri:noCountry>
</affiliation>
<affiliation><nlm:aff id="A2"> Department of Pediatrics, University of Rochester School of Medicine and Dentistry</nlm:aff>
<wicri:noCountry code="subfield">University of Rochester School of Medicine and Dentistry</wicri:noCountry>
</affiliation>
<affiliation><nlm:aff id="A3"> Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry</nlm:aff>
<wicri:noCountry code="subfield">University of Rochester School of Medicine and Dentistry</wicri:noCountry>
</affiliation>
<affiliation><nlm:aff id="A3"> Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry</nlm:aff>
<wicri:noCountry code="subfield">University of Rochester School of Medicine and Dentistry</wicri:noCountry>
</affiliation>
<affiliation><nlm:aff id="A5"> Department of Epidemiology, Republic of Seychelles, Johns Hopkins Bloomberg School of Public Health</nlm:aff>
<wicri:noCountry code="subfield">Johns Hopkins Bloomberg School of Public Health</wicri:noCountry>
</affiliation>
<affiliation><nlm:aff id="A6"> The Ministry of Health, Republic of Seychelles</nlm:aff>
<wicri:noCountry code="subfield">Republic of Seychelles</wicri:noCountry>
</affiliation>
<affiliation><nlm:aff id="A3"> Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry</nlm:aff>
<wicri:noCountry code="subfield">University of Rochester School of Medicine and Dentistry</wicri:noCountry>
</affiliation>
<affiliation><nlm:aff id="A3"> Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry</nlm:aff>
<wicri:noCountry code="subfield">University of Rochester School of Medicine and Dentistry</wicri:noCountry>
</affiliation>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Postnatal Exposure to Methyl Mercury from Fish Consumption: a Review and New Data from the Seychelles Child Development Study</title>
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<front><div type="abstract" xml:lang="en"><sec id="S1"><title>Background</title>
<p id="P2">Fish is an important source of nutrition worldwide. Fish contain both the neurotoxin methyl mercury (MeHg) and nutrients important for brain development. The developing brain appears to be most sensitive to MeHg toxicity and mothers who consume fish during pregnancy expose their fetus prenatally. Although brain development is most dramatic during fetal life, it continues for years postnatally and additional exposure can occur when a mother breast feeds or the child consumes fish. This raises the possibility that MeHg might influence brain development after birth and thus adversely affect children’s developmental outcomes. We reviewed postnatal MeHg exposure and the associations that have been published to determine the issues associated with it and then carried out a series of analyses involving alternative metrics of postnatal MeHg exposure in the Seychelles Child Development Study (SCDS) Main Cohort.</p>
</sec>
<sec sec-type="methods" id="S2"><title>Methods</title>
<p id="P3">The SCDS is a prospective longitudinal evaluation of prenatal MeHg exposure from fish consumption. The Main Cohort includes 779 subjects on whom recent postnatal exposure data were collected at the 6, 19, 29, 66, and 107 month evaluations. We examined the association of recent postnatal MeHg exposure with multiple 66 and 107-month outcomes and then used three types of alternative postnatal exposure metrics to examine their association with the children’s intelligence quotient (IQ) at 107 months of age.</p>
</sec>
<sec id="S3"><title>Results</title>
<p id="P4">Recent postnatal exposure at 107 months of age was adversely associated with four endpoints, three in females only. One alternative postnatal metric was beneficially associated with 9-year IQ in males only.</p>
</sec>
<sec id="S4"><title>Conclusions</title>
<p id="P5">We found several associations between postnatal MeHg biomarkers and children’s developmental endpoints. However, as has been the case with prenatal MeHg exposure in the SCDS Main Cohort study, no consistent pattern of associations emerged to support a causal relationship.</p>
</sec>
</div>
</front>
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