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An automated screening method for detecting compounds with goitrogenic activity using transgenic zebrafish embryos.

Sergio Jarque1, Eva Fetter2, Wouter J Veneman3

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Summary

This study introduces an automated zebrafish assay to screen for goitrogens, chemicals disrupting thyroid function. The method efficiently identifies compounds that interfere with thyroid hormone synthesis using reporter gene fluorescence.

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Area of Science:

  • Environmental toxicology
  • Endocrinology
  • Zebrafish models

Background:

  • Limited knowledge exists on environmental chemicals affecting thyroid signaling.
  • Goitrogens disrupt thyroid gland function, impacting hormone synthesis.
  • Thyroid hormone is crucial for development and metabolism.

Purpose of the Study:

  • To develop and validate an automated method for screening goitrogenic compounds.
  • To assess the efficacy of zebrafish embryos as a model for goitrogen detection.
  • To quantify the potency of known goitrogens using concentration-response modeling.

Main Methods:

  • Utilized a transgenic zebrafish line (tg(tg:mCherry)) with a reporter gene for thyroglobulin.
  • Employed automated zebrafish embryo orientation and capillary-based exposure.
  • Measured reporter gene fluorescence in the thyroid gland following exposure to test compounds.
  • Applied concentration-response modeling to determine EC50 values.

Main Results:

  • The automated system successfully detected goitrogenic activity in zebrafish embryos.
  • Known goitrogens (resorcinol, methimazole, etc.) induced concentration-dependent reporter fluorescence.
  • Fluorescence increased 1.4 to 2.6 fold above control levels for goitrogenic compounds.
  • A negative control (3,4-dichloroaniline) decreased the fluorescence signal.

Conclusions:

  • The automated zebrafish assay provides an efficient and sensitive method for screening environmental goitrogens.
  • This approach can help identify chemicals that interfere with thyroid hormone synthesis.
  • The study highlights the utility of zebrafish models in environmental chemical risk assessment.