The effect of endocrine disrupting chemicals on thyroid hormone binding to Japanese quail transthyretin and thyroid hormone receptor
Ishihara, A; Nishiyama, N; Sugiyama, S; Yamauchi, K
HERO ID
732911
Reference Type
Journal Article
Year
2003
Language
English
PMID
| HERO ID | 732911 |
|---|---|
| In Press | No |
| Year | 2003 |
| Title | The effect of endocrine disrupting chemicals on thyroid hormone binding to Japanese quail transthyretin and thyroid hormone receptor |
| Authors | Ishihara, A; Nishiyama, N; Sugiyama, S; Yamauchi, K |
| Journal | General and Comparative Endrocrinology |
| Volume | 134 |
| Issue | 1 |
| Page Numbers | 36-43 |
| Abstract | We investigated the effect of endocrine disrupting chemicals (EDCs), including medical, industrial, and agricultural chemicals, on 3,3',5-L-[125I]triiodothyronine ([125I]T3) binding to purified Japanese quail transthyretin (qTTR), a major thyroid hormone-binding protein in plasma, and to the ligand-binding domain of thyroid hormone receptor beta (qTR LBD). Scatchard plots of T3 binding to qTTR and qTR LBD revealed two classes of binding sites, with Kd values of 6.9 and 185 nM, and a single class of binding sites, with Kd value of 0.31 nM, respectively. Among the test chemicals, diethylstilbestrol was the most powerful inhibitor of [125I]T3 binding to qTTR (IC50 < 0.4 nM). Diethylstilbestrol, ioxynil (IC50 =1.1+/-0.5 nM) and pentachlorophenol (IC50 = 6.3+/-3.8 nM) displaced [125I]T3 from qTTR more effectively than unlabeled T3 (IC50 = 9.7+/-0.9 nM) did. Although malathion, 4-nonylphenol, bisphenol A and n-butylbenzyl phthalate were effective inhibitors of [125I]T3 binding to qTTR, their potency was two orders of magnitude less than that of T3. All test chemicals except for diethylstilbestrol had either a weak or no effect on [125I]T3 binding to qTR LBD. These results show that several EDCs tested in this study target qTTR rather than qTR LBD. |
| Doi | 10.1016/S0016-6480(03)00197-7 |
| Pmid | 13129501 |
| Wosid | WOS:000185584900005 |
| Url | http://www.sciencedirect.com/science/article/pii/S0016648003001977 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Source: Web of Science WOS:000185584900005 |
| Is Public | Yes |
| Language Text | English |
| Keyword | transthyretin; thyroid hormone receptor; endocrine disrupting chemicals; competitive binding; Japanese quail |
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