Thyroid hormonal activity of the flame retardants tetrabromobisphenol A and tetrachlorobisphenol A

Thyroid hormonal activity of the flame retardants tetrabromobisphenol A and tetrachlorobisphenol A The thyroid hormonal-disrupting activity of the flame retardants tetrabromobisphenol A (TBBPA) and tetrachlorobisphenol A (TCBPA) was examined and compared with that of bisphenol A, a typical estrogenic xenobiotic. TBBPA and TCBPA, halogenated derivatives of bisphenol A, markedly inhibited the binding of triiodothyronine (T 3 ; 1×10 −10 M ) to thyroid hormone receptor in the concentration range of 1×10 −6 to 1×10 −4 M , but bisphenol A did not. The thyroid hormonal activity of TBBPA and TCBPA was also examined using rat pituitary cell line GH3 cells, which grow and release growth hormone (GH) depending on thyroid hormone. TBBPA and TCBPA enhanced the proliferation of GH3 cells and stimulated their production of GH in the concentration range of 1×10 −6 to 1×10 −4 M , while bisphenol A was inactive. TBBPA, TCBPA, and bisphenol A did not show antagonistic action, i.e., these compounds did not inhibit the hormonal activity of T 3 to induce growth and GH production of GH3 cells. TBBPA and TCBPA, as well as bisphenol A, enhanced the proliferation of MtT/E-2 cells, whose growth is estrogen-dependent. These results suggest that TBBPA and TCBPA act as thyroid hormone agonists, as well as estrogens. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biochemical and Biophysical Research Communications Elsevier

Thyroid hormonal activity of the flame retardants tetrabromobisphenol A and tetrachlorobisphenol A

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Publisher
Elsevier
Copyright
Copyright © 2002 Elsevier Science (USA)
ISSN
0006-291x
D.O.I.
10.1016/S0006-291X(02)00262-0
Publisher site
See Article on Publisher Site

Abstract

The thyroid hormonal-disrupting activity of the flame retardants tetrabromobisphenol A (TBBPA) and tetrachlorobisphenol A (TCBPA) was examined and compared with that of bisphenol A, a typical estrogenic xenobiotic. TBBPA and TCBPA, halogenated derivatives of bisphenol A, markedly inhibited the binding of triiodothyronine (T 3 ; 1×10 −10 M ) to thyroid hormone receptor in the concentration range of 1×10 −6 to 1×10 −4 M , but bisphenol A did not. The thyroid hormonal activity of TBBPA and TCBPA was also examined using rat pituitary cell line GH3 cells, which grow and release growth hormone (GH) depending on thyroid hormone. TBBPA and TCBPA enhanced the proliferation of GH3 cells and stimulated their production of GH in the concentration range of 1×10 −6 to 1×10 −4 M , while bisphenol A was inactive. TBBPA, TCBPA, and bisphenol A did not show antagonistic action, i.e., these compounds did not inhibit the hormonal activity of T 3 to induce growth and GH production of GH3 cells. TBBPA and TCBPA, as well as bisphenol A, enhanced the proliferation of MtT/E-2 cells, whose growth is estrogen-dependent. These results suggest that TBBPA and TCBPA act as thyroid hormone agonists, as well as estrogens.

Journal

Biochemical and Biophysical Research CommunicationsElsevier

Published: Apr 26, 2002

References

  • Brominated flame retardants induce intragenic recombination in mammalian cells
    Helleday, T.; Tuominen, K.-L.; Bergman, A.; Jenssen, D.
  • Hydroxylated polychlorinated biphenyls (PCBs) as estrogens and antiestrogens: structure–activity relationships
    Connor, K.; Ramamoorthy, M.; Moore, M.; Mustain, M.; Chen, I.; Safe, S.; Zacharewski, T.; Gillesby, B.; Joyeux, A.; Balague, P.
  • Evaluation of chemicals with endocrine modulating activity in yeast-based steroid hormone receptor gene transcription assay
    Gaido, K.W.; Leonard, L.S.; Lovell, S.; Gould, J.C.; Babai, D.; Portier, C.J.; Mcdonell, D.P.
  • In vivo comparison of xenoestrogens using rainbow trout vitellogenin induction as a screening system
    Christiansen, L.B.; Pedersen, S.N.; Korsgaard, B.; Bjerregaard, P.

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