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Thyroid Hormone Signalling: From the Dawn of Life to the Bedside

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Abstract

Thyroid hormone (TH) signalling is a key modulator of fundamental biological processes that has been evolutionarily conserved in both vertebrate and invertebrate species. TH may have initially emerged as a nutrient signal to convey environmental information to organisms to induce morpho-anatomical changes that could maximise the exploitation of environmental resources, and eventually integrated into the machinery of gene regulation and energy production to become a key regulator of development and metabolism. As such, TH signalling is particularly sensitive to environmental stimuli, and its alterations result in fundamental changes in homeostasis and physiology. Stressful stimuli of various origins lead to changes in the TH–TH receptor (TR) axis in different adult mammalian organs that are associated with phenotypical changes in terminally differentiated cells, the reactivation of foetal development programmes, structural remodelling and pathological growth. Here, we discuss the evolution of TH signalling, review evolutionarily conserved functions of THs in essential biological processes, such as metamorphosis and perinatal development, and analyse the role of TH signalling in the phenotypical and morphological changes that occur after injury, repair and regeneration in adult mammalian organs. Finally, we examine the potential of TH treatment as a therapeutic strategy for improving organ structure and functions following injury.

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Acknowledgements

The authors wish to thank Giuseppe Remuzzi for constructive comments on the text, Rubina Novelli for the outstanding contribution to the writing and refinement of the manuscript, and Kerstin Mierke for excellent editing work on the manuscript. AML and CX’s research is funded by European Foundation for the Study of Diabetes (EFSD)/Novo Nordisk, the Associazione per la Ricerca sul Diabete Italia, Evotec and Bellco/Medtronics.

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Correspondence to Christodoulos Xinaris.

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The authors declare that they have no conflict of interest.

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Handling Editor: Konstantinos Voskarides.

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Mourouzis, I., Lavecchia, A.M. & Xinaris, C. Thyroid Hormone Signalling: From the Dawn of Life to the Bedside. J Mol Evol 88, 88–103 (2020). https://doi.org/10.1007/s00239-019-09908-1

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  • DOI: https://doi.org/10.1007/s00239-019-09908-1

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