Thyroid and Brain: Understanding the Actions of Thyroid Hormones in Brain Development and Function

Author(s): Juan Bernal * .

DOI: 10.2174/9789815274226124010013

Pathophysiology and Mouse Models of Thyroid Hormone Resistance Syndromes: A Focus on the Brain

Pp: 166-179 (14)

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* (Excluding Mailing and Handling)

  • * (Excluding Mailing and Handling)

Abstract

SHS investigation development is considered from the geographical and historical viewpoint. 3 stages are described. Within Stage 1 the work was carried out in the Department of the Institute of Chemical Physics in Chernogolovka where the scientific discovery had been made. At Stage 2 the interest to SHS arose in different cities and towns of the former USSR. Within Stage 3 SHS entered the international scene. Now SHS processes and products are being studied in more than 50 countries.

Abstract

Thyroid hormone receptor mutations cause syndromes of resistance to the action of thyroid hormones (RTH) with autosomal dominant inheritance. Mutations in the THRA gene, encoding TRα1 and TRα2, cause RTHα, and those in THRB, encoding TRβ1 and TRβ2, cause RTHβ. In RTHα, relatively mild changes in circulating thyroid hormones coexist with signs of congenital hypothyroidism. In contrast, in RTHβ, TSH levels are not suppressed despite elevated thyroid hormone levels. The mutant receptors have low or no T3-induced activation and display dominant negative activity, inhibiting the wild-type receptors’ transcriptional activation. This chapter describes the main characteristics of RTH, including a discussion of the mouse models of the disorder, with an emphasis on neural aspects.

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