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. 2007 Dec;115 Suppl 1(Suppl 1):77-83.
doi: 10.1289/ehp.9369.

Endocrine disruptors and the thyroid gland--a combined in vitro and in vivo analysis of potential new biomarkers

Cornelia Schmutzler  1 , Inka Gotthardt, Peter J Hofmann, Branislav Radovic, Gabor Kovacs, Luise Stemmler, Inga Nobis, Anja Bacinski, Birgit Mentrup, Petra Ambrugger, Annette Grüters, Ludwik K Malendowicz, Julie Christoffel, Hubertus Jarry, Dana Seidlovà-Wuttke, Wolfgang Wuttke, Josef Köhrle
Affiliations

Endocrine disruptors and the thyroid gland--a combined in vitro and in vivo analysis of potential new biomarkers

Cornelia Schmutzler et al. Environ Health Perspect. 2007 Dec.

Abstract

Background: There is growing evidence that, in addition to the reproductive system, the hypothalamic-pituitary-thyroid axis is a target of endocrine-disrupting compounds (EDCs). However, this is not reflected adequately in current screening and assessment procedures for endocrine activity that to date determine only general parameters of thyroid function.

Objective and methods: We used several in vitro and ex vivo assays in an attempt to identify suitable biomarkers for antithyroid action testing a selected panel of putative EDCs.

Results: In vitro we detected stimulation or inhibition of iodide uptake into FRTL-5 rat thyroid cells, inhibition of thyroid hormone binding to transthyretin, agonistic or antagonistic effects in a thyroid hormone receptor-dependent reporter assay, and inhibition of thyroid peroxidase using a novel assay system based on human recombinant thyroperoxidase that might be suitable for routine screening for potential EDCs. In rats, chronic application of several EDCs led to changes in thyroid morphology, alterations of thyrotropin and thyroid hormone serum levels as well as alterations in peripheral thyroid hormone-regulated end points such as malic enzyme and type I 5'-deiodinase activity.

Conclusions: As the effects of EDCs do not reflect classic mechanisms of hormone-dependent regulation and feedback, we believe multitarget and multimodal actions of EDCs affect the hypothalamic-pituitary-thyroid axis. These complex effects require a diverse approach for screening, evaluation, and risk assessment of potential antithyroid compounds. This approach involves novel in vitro or cell-based screening assays in order to assess thyroid hormone synthesis, transport, metabolism, and action as well as in vivo assays to measure thyroid hormone-regulated tissue-specific and developmental end points in animals.

Keywords: UV filters; deiodinase; flavonoids; malic enzyme; pituitary; sodium iodide symporter; thyroid gland; thyroid peroxidase; transthyretin.

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References

    1. Andersson M, Takkouche B, Egli I, Allen HE, de Benoist B. Current global iodine status and progress over the last decade towards the elimination of iodine deficiency. Bull WHO. 2005;83:518–525. - PMC - PubMed
    1. Anway MD, Cupp AS, Uzumcu M, Skinner MK. Epigenetic transgenerational actions of endocrine disrupters and male fertility. Science. 2005;308:1466–1469. - PMC - PubMed
    1. Ares S, Quero J, Morreale de Escobar G. Neonatal iodine deficiency: clinical aspects. J Pediatr Endocrinol Metab. 2005;18(suppl 1):1257–1264. - PubMed
    1. Auf’mkolk M, Amir SM, Kubota K, Ingbar SH. The active principles of plant extracts with antithyrotropic activity: oxidation products of derivatives of 3,4-dihydroxycinnamic acid. Endocrinology. 1985a;116:1677–1686. - PubMed
    1. Auf’mkolk M, Ingbar JC, Kubota K, Amir SM, Ingbar SH. Extracts and auto-oxidized constituents of certain plants inhibit the receptor-binding and the biological activity of Graves’ immunoglobulins. Endocrinology. 1985b;116:1687–1693. - PubMed

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