A Novel Transgenic Model to Study Thyroid Axis Activity in Early Life Stage Medaka

Overview

Journal Environ Sci Technol

Publisher American Chemical Society

Specialty Environmental Health

Date 2023 Dec 20

PMID 38117130

Authors

Elise Pesce

Marion Garde

Muriel Rigolet

Andrew J Tindall

Gregory F Lemkine

Lisa A Baumann

Laurent M Sachs

David Du Pasquier

Affiliations

Soon will be listed here.

Abstract

Identifying endocrine disrupting chemicals in order to limit their usage is a priority and required according to the European Regulation. There are no Organization for Economic Co-operation and Development (OECD) test guidelines based on fish available for the detection of Thyroid axis Active Chemicals (TACs). This study aimed to fill this gap by developing an assay at eleuthero-embryonic life stages in a novel medaka () transgenic line. This transgenic line expresses green fluorescent protein (GFP) in thyrocytes, under the control of the medaka gene promoter. The fluorescence expressed in the thyrocytes is inversely proportional to the thyroid axis activity. When exposed for 72 h to activators (triiodothyronine (T) and thyroxine (T)) or inhibitors (6--propylthiouracil (PTU), Tetrabromobisphenol A (TBBPA)) of the thyroid axis, the thyrocytes can change their size and express lower or higher levels of fluorescence, respectively. This reflects the regulation of thyroglobulin by the negative feedback loop of the Hypothalamic-Pituitary-Thyroid axis. T, T, PTU, and TBBPA induced fluorescence changes with the lowest observable effect concentrations (LOECs) of 5 μg/L, 1 μg/L, 8 mg/L, and 5 mg/L, respectively. This promising tool could be used as a rapid screening assay and also to help decipher the mechanisms by which TACs can disrupt the thyroid axis in medaka.

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