PMID: 9653548Jul 8, 1998Paper

A high-affinity subtype-selective agonist ligand for the thyroid hormone receptor

Chemistry & Biology
Grazia ChielliniThomas S Scanlan

Abstract

Thyroid hormones regulate many different physiological processes in different tissues in vertebrates. Most of the actions of thyroid hormones are mediated by the thyroid hormone receptor (TR), which is a member of the nuclear receptor superfamily of ligand-activated transcription regulators. There are two different genes that encode two different TRs, TR alpha and TR beta, and these two TRs are often co-expressed at different levels in different tissues. Most thyroid hormones do not discriminate between the two TRs and bind both with similar affinities. We have designed and synthesized a thyroid hormone analog that has high affinity for the TRs and is selective in both binding and activation functions for TR beta over TR alpha. The compound, GC-1, was initially designed to solve synthetic problems that limit thyroid hormone analog preparation, and contains several structural changes with respect to the natural hormone 3,5,3'-triiodo-L-thyronine (T3). These changes include replacement of the three iodines with methyl and isopropyl groups, replacement of the biaryl ether linkage with a methylene linkage, and replacement of the amino-acid sidechain with an oxyacetic-acid sidechain. The results of this study show that GC-1 is a mem...Continue Reading

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Citations

Jun 11, 2005·Cell and Tissue Research·Elen H MiyabaraAnselmo S Moriscot
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