Behavioral Changes in Aging but Not Young Mice after Neonatal Exposure to the Polybrominated Flame Retardant DecaBDE
| Autor: | Deborah C. Rice, Vincent P. Markowski, Elizabeth A. Reeve, W. Douglas Thompson, Kristen D. Onos, Mina Assadollahzadeh |
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| Rok vydání: | 2009 |
| Předmět: |
Male
Aging decabrominated diphenyl ether endocrine system Reinforcement Schedule Health Toxicology and Mutagenesis impulsivity perseveration macromolecular substances PBDE Discrimination Learning Toxicology Mice fluids and secretions Polybrominated diphenyl ethers fixed interval Halogenated Diphenyl Ethers Animals Fixed interval reproductive and urinary physiology Flame Retardants Sex Characteristics visual discrimination Behavior Animal behavior Chemistry Research Public Health Environmental and Occupational Health fixed ratio humanities Mice Inbred C57BL Animals Newborn behavioral effects Environmental chemistry Visual discrimination Conditioning Operant neonatal exposure Female C57BL6 mouse Fixed ratio Fire retardant |
| Zdroj: | Environmental Health Perspectives |
| ISSN: | 1552-9924 0091-6765 |
| Popis: | Background After several decades of commercial use, the flame-retardant chemicals polybrominated diphenyl ethers (PBDEs) and their metabolites are pervasive environmental contaminants and are detected in the human body. Decabrominated diphenyl ether (decaBDE) is currently the only PBDE in production in the United States. Objectives Little is known about the health effects of decaBDE. In the present study we examined the effects of neonatal decaBDE exposure on behavior in mice at two ages. Methods Neonatal male and female C57BL6/J mice were exposed to a daily oral dose of 0, 6, or 20 mg/kg decaBDE from postnatal days 2 through 15. Two age groups were examined: a cohort that began training during young adulthood and an aging cohort of littermates that began training at 16 months of age. Both cohorts were tested on a series of operant procedures that included a fixed-ratio 1 schedule of reinforcement, a fixed-interval (FI) 2-min schedule, and a light–dark visual discrimination. Results We observed minimal effects on the light–dark discrimination in the young cohort, with no effects on the other tasks. The performance of the aging cohort was significantly affected by decaBDE. On the FI schedule, decaBDE exposure increased the overall response rate. On the light–dark discrimination, older treated mice learned the task more slowly, made fewer errors on the first-response choice of a trial but more perseverative errors after an initial error, and had lower latencies to respond compared with controls. Effects were observed in both dose groups and sexes on various measures. Conclusions These findings suggest that neonatal decaBDE exposure produces effects on behavioral tasks in older but not younger animals. The behavioral mechanisms responsible for the pattern of observed effects may include increased impulsivity, although further research is required. |
| Databáze: | OpenAIRE |
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