LIGAND-DEPENDENT SYNERGY OF THYROID-HORMONE AND RETINOID X-RECEPTORS

被引：0

作者：

ROSEN, ED ^{[1
]}

ODONNELL, AL ^{[1
]}

KOENIG, RJ ^{[1
]}

机构：

[1] UNIV MICHIGAN,MED CTR,DIV ENDOCRINOL,1150 W MED CTR DR,5560 MSRB2,ANN ARBOR,MI 48109

来源：

JOURNAL OF BIOLOGICAL CHEMISTRY | 1992年 / 267卷 / 31期

关键词：

D O I：

暂无

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The binding of thyroid hormone receptors to DNA is enhanced by heterodimerization with nuclear proteins. One such heterodimerization partner has recently been characterized as the retinoid X receptor. 9-cis-Retinoic acid has been identified as a natural ligand for retinoid X receptors, suggesting a potential receptor-mediated interaction between thyroid hormone and 9-cis-retinoic acid in the regulation of thyroid hormone-responsive genes. A transient cotransfection assay was used to test for such an interaction. When a complex thyroid hormone response element composed of both direct and inverted repeat hexamers was tested, these two ligands activated gene expression synergistically. In contrast, when the response element consisted only of directly repeated hexamers, unliganded retinoid X receptors enhanced thyroid hormone responsiveness, but 9-cis-retinoic acid induced no additional activation. The results suggest a unique mechanism to achieve differential thyroid hormone sensitivity of thyroid hormone-responsive genes within a cell. Genes with appropriate response elements will show amplification of the thyroid hormone response by 9-cis-retinoic acid in the presence of retinoid X receptors; other thyroid hormone-responsive genes will be influenced by retinoid X receptors, but not 9-cis-retinoic acid.

引用

页码：22010 / 22013

页数：4

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