The present study investigated whether inhibition of deiodinase, the enzyme which converts thyroxine (T4) to the more biologically-active form, 3,5,3'-triiodothyronine (T3), would impact inflation of the posterior and/or anterior chamber of the swim bladder, processes previously demonstrated to be thyroid-hormone regulated. Two experiments were conducted using a model deiodinase inhibitor, iopanoic acid (IOP). In the first study, fathead minnow (Pimephales promelas) embryos were exposed to 0.6, 1.9, or 6.0 mg IOP/L or control water in a flow-through system until reaching 6 days post-fertilization (dpf) at which time posterior swim bladder inflation was assessed. To examine effects on anterior swim bladder inflation, a second study was conducted with 6 dpf larvae exposed to the same IOP concentrations until reaching 21 dpf. Fish from both studies were sampled for T4/T3 measurements, gene transcription analyses, and thyroid histopathology. In the embryo study, incidence and length of inflated posterior swim bladders were significantly reduced in the 6.0 mg/L treatment at 6 dpf. Incidence of inflation and length of anterior swim bladder in larval fish were significantly reduced in all IOP treatments at 14 dpf, but inflation recovered by 18 dpf. Throughout the larval study, whole body T4 concentrations were significantly increased and T3 concentrations were significantly decreased in all IOP treatments. Consistent with hypothesized compensatory responses, significant up-regulation of deiodinase-2 mRNA was observed in the larval study, and down-regulation of thyroperoxidase mRNA was observed in all IOP treatments in both studies. Taken together, these results support the hypothesized adverse outcome pathways linking inhibition of deiodinase activity to impaired swim bladder inflation. This dataset is associated with the following publication: Cavallin, J., G. Ankley, B. Blackwell, C. Blanksma, K. Fay, K. Jensen, M. Kahl, D. Knapen, P. Kosian, S. Poole, E. Randolph, A. Schroeder, L. Vergauwen, and D. Villeneuve. Impaired swim bladder inflation in early-life stage fathead minnows exposed to a deiodinase inhibitor, iopanoic acid (article). ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY. Society of Environmental Toxicology and Chemistry, Pensacola, FL, USA, 36(11): 2942-2952, (2017).

In this study, a hypothesized adverse outcome pathway (AOP) linking inhibition of thyroid peroxidase (TPO) activity to impaired swim bladder inflation was investigated in experiments in which fathead minnows were exposed to the TPO inhibitor 2-mercaptobenzothiazole (MBT). Results show that anterior, but not posterior, swim bladder inflation was impacted by exposure to MBT supporting the development of an AOP linking a specific thyroid-disrupting molecular initiating event to a significant phenotypic outcome. Results also suggest an alternative short-term in vivo test with larval fathead minnows that could be used to screen chemicals for thyroid disrupting activity and possibly distinguish thyroid disrupting modes of action. The dataset contains information on TPO expression, thyroid hormone concentrations, and swim bladder inflation measurements in larval fathead minnows. This dataset is associated with the following publication: Nelson, K., A. Schroeder , G. Ankley , B. Blackwell, C. Blanksma, S. Degitz , K. Jensen , R. Johnson , M. Kahl , D. Knapen, P. Kosian , R. Milsk, E. Randolph, T. Saari, E. Stinckens, L. Vergauwen, and D. Villeneuve. Impaired anterior swim bladder inflation following exposure to the thyroid peroxidase inhibitor 2-Mercaptobenzothiazole Part I: Fathead minnow. AQUATIC TOXICOLOGY. Elsevier Science Ltd, New York, NY, USA, 173: 192-203, (2016).

The data set provides all data that were reported in results, tables, and figures associated with Stinckens et al., "The effect of thyroperoxidase and deiodinase inhibition on anterior swim bladder inflation in the zebrafish". The data set includes: 1) Effects of three test chemicals on thyroperoxidase enzyme activity 2) Effects of three test chemicals on deiodinase enzyme activity 3) Thyroid hormone (T3 and T4) concentrations measured in exposed larvae 4) Measures of posterior and anterior swimbladder chamber inflation and surface areas. 5) Data on swimming behavior (distance) of exposed fish. 6) Measured concentrations of the test chemicals in the test media and tissues. This dataset is associated with the following publication: Stinckens, E., L. Vergauwen, B. Blackwell, G. Ankley, D. Villeneuve, and D. Knapen. Effect of thyroperoxidase and deiodinase inhibition on anterior swim bladder inflation in the zebrafish. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, USA, 54(10): 6213-6223, (2020).

The data set provides all data that were reported in results, tables, and figures associated with Stinckens et al., "The effect of thyroperoxidase and deiodinase inhibition on anterior swim bladder inflation in the zebrafish". The data set includes: 1) Effects of three test chemicals on thyroperoxidase enzyme activity 2) Effects of three test chemicals on deiodinase enzyme activity 3) Thyroid hormone (T3 and T4) concentrations measured in exposed larvae 4) Measures of posterior and anterior swimbladder chamber inflation and surface areas. 5) Data on swimming behavior (distance) of exposed fish. 6) Measured concentrations of the test chemicals in the test media and tissues. This dataset is associated with the following publication: Stinckens, E., L. Vergauwen, B. Blackwell, G. Ankley, D. Villeneuve, and D. Knapen. Effect of thyroperoxidase and deiodinase inhibition on anterior swim bladder inflation in the zebrafish. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, USA, 54(10): 6213-6223, (2020).

This dataset contains in vitro and in vivo biochemical and apical (i.e., growth/development) data pertaining to iodotyrosine deiodinase inhibition in the African clawed frog (Xenopus laevis). This dataset is associated with the following publication: Haselman, J., J. Olker, P. Kosian, J. Korte, J. Denny, J. Tietge, M. Hornung, and S. Degitz. Characterization of the Mechanistic Linkages Between Iodothyronine Deiodinase Inhibition and Impaired Thyroid-Mediated Growth and Development in Xenopus Laevis Using Iopanoic Acid. TOXICOLOGICAL SCIENCES. Society of Toxicology, RESTON, VA, 187(1): 139-149, (2022).

This dataset contains in vitro and in vivo biochemical and apical (i.e., growth/development) data pertaining to iodotyrosine deiodinase inhibition in the African clawed frog (Xenopus laevis). This dataset is associated with the following publication: Haselman, J., J. Olker, P. Kosian, J. Korte, J. Denny, J. Tietge, M. Hornung, and S. Degitz. Characterization of the Mechanistic Linkages Between Iodothyronine Deiodinase Inhibition and Impaired Thyroid-Mediated Growth and Development in Xenopus Laevis Using Iopanoic Acid. TOXICOLOGICAL SCIENCES. Society of Toxicology, RESTON, VA, 187(1): 139-149, (2022).

Disruption of thyroid hormone signaling is a form of endocrine disruption that is of concern to both human health and ecosystems. Research is being conducted to define the biological targets chemicals may interact with to disrupt thyroid hormone signaling and the stages in development where that disruption can most readily lead to adverse effects. The present data characterize the expression of key genes associated with thyroid hormone signaling and regulation over the course of development for two small fish widely used in aquatic ecotoxicology research. These data provide baseline information that can lead to a more complete understanding of which thyroid disrupting chemicals fish may be susceptible to and at which stages in development. This dataset is associated with the following publication: Vergauwen, L., J. Cavallin, G. Ankley, C. Bars, I. Gabriels, E. Michiels, K. Nelson, J. Periz-Stanacev, E. Randolph, S. Robinson, T. Saari, A. Schroeder, E. Stinckens, J. Swintek, S. Van Cruchten, E. Verbueken, D. Villeneuve, and D. Knapen. Gene transcription ontogeny of thyroid-axis development in early-life stage fathead minnow and zebrafish. Journal of Experimental Biology. The Company of Biologists LIMITED, Cambridge, UK, 266: 878-1002, (2018).

Fathead minnows (Pimephales promelas) were exposed to 100 ug/L indomethacin, 200 ug/L ibuprofen, or 20 ug/L celecoxib for 96 h. Effects on cycloxygenase enzyme activity in ovary, prostaglandin F2alpha concentrations in plasma, 17beta-estradiol concentrations in plasma, and vitellogenin concentrations in plasma were measured. Gene expression in ovary samples was evaluated using a 15,000 probe oligonucleotide microarray. Transcriptomics data (raw data and normalized) are available through the National Center for Biotechnology Information, Gene Expression Omnibus (GEO), accession number GSE72976. Metabolite profiles in liver tissue were measured by proton nuclear magnetic resonance. In addition to these data, the data set also contains identification of differentially expressed genes, pathway enrichment and gene set enrichment analyes, ToxCast data for indomethacin and celecoxib, chemical-gene interaction data derived from the Comparative Toxicogenomics database, and results from Level 1, Level 2, and Level 3 SeqAPASS analyses that examine conservation of target proteins across species (https://seqapass.epa.gov/seqapass/). This dataset is associated with the following publication: Martinovic-Weigelt, D., A. Mehinto, G. Ankley , J. Berninger, T. Collette , J. Davis , N. Denslow, E. Durhan, E. Eid, D. Ekman , K. Jensen , M. Kahl , C. LaLone , Q. Teng , and D. Villeneuve. Derivation and evaluation of putative adverse outcome pathways for the effects of cyclooxygenase inhibitors on reproductive processes in female fish. TOXICOLOGICAL SCIENCES. Society of Toxicology, 156(2): 344-361, (2017).

This excel file contains the resultant data from a study on iodotyrosine deiodinase in the model amphibian species, Xenopus laevis. These data include: tadpole growth and development, thyroid hormones in plasma and glands, and expression of thyroid-relevant genes. The initial worksheet tab that provides metadata for each dataset included in the other worksheets that make up the file. This dataset is associated with the following publication: Olker, J., J. Haselman, P. Kosian, K. Donnay, J. Korte, C. Blanksma, M. Hornung, and S. Degitz. Evaluating iodide recycling inhibition as a novel molecular initiating event for thyroid axis disruption in amphibians. TOXICOLOGICAL SCIENCES. Society of Toxicology, RESTON, VA, 166(2): 318-331, (2018).

This data set describes experiments that were conducted to investigate whether exposure of male fathead minnows to environmentally-relevant estrone concentrations would result in elevated plasma 17β-estradiol concentrations in the fish. Secondly, we sought to establish whether observed elevations in plasma 17β-estradiol occurred as a result of the conversion of external estrone by the fish using an approach involving exposure of the fish to 13C-labeled estrone. Endpoints reported in the dataset include plasma 17β-estradiol and estrone concentrations, plasma vitellogenin concentrations, hepatic vitellogenin mRNA, 13C-labeled plasma 17β-estradiol and estrone concentrations, and testicular and/or hepatic expression of aromatase and several hydroxysteroid dehydrogenases involved in estrone metabolism. This dataset is associated with the following publication: Ankley, G., D. Feifarek, B. Blackwell, J. Cavallin, K. Jensen, M. Kahl, S. Poole, E. Randolph, T. Saari, and D. Villeneuve. Reevaluating the significance of estrone as an environmental estrogen (article). ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, USA, 51: 4705-4713, (2017).