Abstract
We immunohistochemically investigated the impact and reversibility of three brominated flame retardants (BFRs) known to be weak thyroid hormone disruptors on neuronal development in the hippocampal formation and apoptosis in the dentate subgranular zone. Pregnant Sprague–Dawley rats were exposed to 10, 100, or 1,000 ppm decabromodiphenyl ether (DBDE); 100, 1,000 or 10,000 ppm tetrabromobisphenol A (TBBPA) or 1,2,5,6,9,10-hexabromocyclododecane (HBCD) in the diet from gestational day 10 through to day 20 after delivery (weaning). On postnatal day (PND) 20, interneurons in the dentate hilus–expressing reelin increased with all chemicals, suggestive of aberration of neuronal migration. However, this increase had disappeared by PND 77. NeuN-positive mature neurons increased in the hilus on PND 77 with all chemicals. In the subgranular zone on PND 20, an increase in apoptotic bodies suggestive of impaired neurogenesis was observed after exposure to TBBPA or HBCD. The effects on neuronal development were detected at doses of ≥100 ppm DBDE; ≥1,000 ppm TBBPA; and at least at 10,000 ppm HBCD. On PND 20, the highest dose of DBDE and HBCD revealed mild fluctuations in the serum concentrations of thyroid-related hormones suggestive of weak developmental hypothyroidism, while TBBPA did not. Thus, DBDE and TBBPA may exert direct effect on neuronal development in the brain, but hypothyroidism may be operated for DBDE and HBCD at high doses. An excess of mature neurons in the hilus at later stages may be the signature of the developmental effects of BFRs. However, the effect itself was reversible.
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Abbreviations
- BFRs:
-
Brominated flame retardants
- BW:
-
Body weight
- CA1:
-
Cornu ammonis 1
- DBDE:
-
Decabromodiphenyl ether
- EphA5:
-
Ephrin type A receptor 5
- GABA:
-
γ-Aminobutyric acid
- GAD67:
-
Glutamic acid decarboxylase 67
- GD:
-
Gestational day
- HBCD:
-
1,2,5,6,9,10-Hexabromocyclododecane
- NeuN:
-
Neuron-specific nuclear protein
- PND:
-
Postnatal day
- SGZ:
-
Subgranular zone
- Tacr3:
-
Tachykinin receptor 3
- TBBPA:
-
Tetrabromobisphenol A
- TH:
-
Thyroid hormone
- T3 :
-
Triiodothyronine
- T4 :
-
Thyroxine
- TSH:
-
Thyroid-stimulating hormone
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Acknowledgments
We thank Miss Tomomi Morikawa for her technical assistance in conducting the animal studies. We also thank Mrs. Shigeko Suzuki for her technical assistance in preparing the histological specimens. This work was supported in part by Health and Labour Sciences Research Grants (Research on Risk of Chemical Substances) from the Ministry of Health, Labour and Welfare of Japan. All authors disclose that there are no conflicts of interest that could inappropriately influence the outcome of the present study.
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Saegusa, Y., Fujimoto, H., Woo, GH. et al. Transient aberration of neuronal development in the hippocampal dentate gyrus after developmental exposure to brominated flame retardants in rats. Arch Toxicol 86, 1431–1442 (2012). https://doi.org/10.1007/s00204-012-0824-4
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DOI: https://doi.org/10.1007/s00204-012-0824-4