'Hydroxylated polychlorinated biphenyls (OH-PCBs), unlike PCBs, are in general readily excreted yet are still detected in humans and animals. Active transport of OH-PCBs across the placenta and hydroxylation of PCBs by the fetus suggest the potential for greater impact on the fetus compared with the parent PCB compounds, but little is known about their health effects, particularly in humans,' researchers in the United States report.
'The objective of this study was to evaluate the associations between prenatal OH-PCB exposure and neurodevelopment in children at 16 months of age in eastern Slovakia. A birth cohort (n = 1,134) was enrolled during 2002-2004. We analyzed six OH-PCB metabolites (4-OH-CB-107,3-OH-CB-153,4-OH-CB-146,3'-OH-CB-138,4-OH-CB-187, and 4'-OH-CB-172) in a subset of the cohort. The Bayley Scales of Infant Development were administered to the children at the 16-month follow-up visit. We developed multiple linear regression models predicting standardized scores for the Mental Development Index (MDI) and Psychomotor Development Index (PDI) from maternal (n = 147) and cord (n = 80) serum OH-PCB concentrations, adjusting for sex of child, district, HOME (Home Observation for Measurement of the Environment) score, and maternal score on Raven's Progressive Matrices. Cord 4-OH-CB-107 was significantly associated with lower MDI (beta = -2.27; p = 0.01) and PDI (beta = -4.50; p = 0.004). Also, maternal 4-OH-CB-107 was significantly associated with lower MDI (beta = -1.76; p = 0.03) but not PDI. No other OH-PCB metabolites were associated with decreased PDI or MDI,' wrote H.Y. Park and colleagues, University of California.
The researchers concluded: 'Our findings showed a significant association of 4-OH-CB-107 with decreased MIDI, which can possibly be mediated by endocrine disruption, altered neurotransmitter functions, or reduced thyroid hormone concentrations in brain.'
Park and colleagues published their study in Environmental Health Perspectives (Exposure to Hydroxylated Polychlorinated Biphenyls (OH-PCBs) in the Prenatal Period and Subsequent Neurodevelopment in Eastern Slovakia. Environmental Health Perspectives, 2009;117(10):1600-1606).
For additional information, contact H.Y. Park, University of California, Dept. of Public Health Science, Division Epidemiology, School Medical, MS1C, 1 Shields Avenue, Davis, CA 95616, USA.
Publisher contact information for the journal Environmental Health Perspectives is: Us Dept. Health Human Sciences Public Health Science, National Institute Health, National Institute Environmental Health Sciences, PO Box 12233, Research Triangle Pk, NC 27709-2233, USA.
Keywords: United States, Davis, Life Sciences, Environmental Health, Pediatrics, University of California.
This article was prepared by Ecology, Environment & Conservation editors from staff and other reports. Copyright 2009, Ecology, Environment & Conservation via VerticalNews.com.
