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Updated: Aug 24, 2026

In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse
Published on: October 6, 2023
Hyper and hypothyroidism change the expression and diurnal variation of thyroid hormone receptor isoforms in rat
B Zandieh-Doulabi1, M Platvoet-ter Schiphorst, A Kalsbeek
1Department of Endocrinology and Metabolism, F5-171, Academic Medical Centre, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands.
Abstract:
We investigated the effect of hypothyroidism or hyperthyroidism on mRNA and protein expression, diurnal variation and zonal distribution of thyroid hormone receptor (TR) isoforms TRalpha1, TRalpha2 and TRbeta1 in rat liver. Hypothyroidism results in increased isoform mRNA and protein expression whereas hyperthyroidism shows a decreased TRalpha1 and TRalpha2 mRNA and protein expression. During hyperthyroidism no change is seen in TRbeta1 mRNA, but TRbeta1 protein is upregulated in the light period and downregulated in the dark period. Diurnal changes (measured at 13:30 and 19:30 h) in the TR isoform proteins are abolished in hypothyroidism and hyperthyroidism, with the exception of a reversal in diurnal changes of TRbeta1 in hyperthyroidism. Zonal distribution of the isoforms is not affected by hypo- or hyperthyroidism. We therefore conclude that thyroid hormone influences both the levels and the diurnal expression of its receptor isoforms but not the zonal distribution.
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