Pre- and postnatal polychlorinated biphenyl concentrations and longitudinal measures of thymus volume in infants

Todd A. Jusko, Dean Sonneborn, Lubica Palkovicova, Anton Kocan, Beata Drobna, Tomas Trnovec, Irva Hertz-Picciotto

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Background: Previously, we reported an association between higher maternal polychlorinated biphenyl (PCB) concentrations and smaller thymus volume in newborns in a birth cohort residing in eastern Slovakia. Objective: In the present report we address whether thymus volume at later ages is influenced by prenatal and early postnatal PCB exposure. Methods: At the time of delivery, 1,134 mother-infant pairs were enrolled. Maternal and 6- and 16-month infant blood samples were collected and analyzed for 15 PCB congeners. Thymus volume was measured in infants shortly after birth and at ages 6 and 16 months using ultrasonography. Results: Higher maternal PCB concentration was associated with reduced thymus volume at birth [a 0.21 SD reduction in thymus volume for an increase in total maternal PCB concentration from the 10th to the 90th percentile; 95% confidence interval (CI): -0.37, -0.05], whereas maternal PCB concentration was not predictive of 6- and 16-month thymus volume. Six-month infant PCB concentration was associated with a 0.40 SD decrease in 6-month thymus volume (95% CI: -0.76, -0.04). There was also some suggestion that thymus volume at 16 months was positively associated with concurrent infant PCB concentration. Conclusions: The potential adverse effects of in utero PCB exposure on thymic development may extend beyond the neonatal period. Results from this highly exposed cohort provide suggestive evidence that postnatal PCB concentrations may be influential, but a smaller set of 6-month PCB measurements limited statistical power at that time point. Implications regarding impaired immunologic maturation or long-term clinical implications remain to be determined.

Original languageEnglish (US)
Pages (from-to)595-600
Number of pages6
JournalEnvironmental Health Perspectives
Volume120
Issue number4
DOIs
StatePublished - Apr 2012

Keywords

  • Atrophy
  • Cohort
  • Epidemiology
  • Immune
  • Roma
  • T cell

ASJC Scopus subject areas

  • Health, Toxicology and Mutagenesis
  • Public Health, Environmental and Occupational Health

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