Abstract
The position of the dose-response curve for steroid-regulated gene expression determines how much variation in response will accompany the normal physiological changes in circulating steroid. Over the last several years, it has become clear that the concentration of steroid hormone required for half-maximal induction or repression by a given receptor-steroid complex, which is normally called the EC50, is not constant for all responsive genes. Thus, the position of the dose-response curve can change so that a single concentration of steroid produces very different percentages of maximal activity. This, in turn, allows for the differential expression of genes by a common steroid hormone concentration during development, differentiation, and homeostasis. Here we review the variety of factors that influence the EC50 and position of the dose-response curve for steroid hormone receptors, discuss what is known about the mechanisms, and highlight promising areas for future research.
Keywords: receptor-steroid interactions, dissociation constant, Corepressors, Michaelis-Menton kinetics, Ubc9, Chaperone Proteins
Current Topics in Medicinal Chemistry
Title: How Much is Enough? Modulation of Dose-Response Curve for Steroid Receptor-Regulated Gene Expression by Changing Concentrations of Transcription Factor
Volume: 6 Issue: 3
Author(s): S. S. Simons Jr.
Affiliation:
Keywords: receptor-steroid interactions, dissociation constant, Corepressors, Michaelis-Menton kinetics, Ubc9, Chaperone Proteins
Abstract: The position of the dose-response curve for steroid-regulated gene expression determines how much variation in response will accompany the normal physiological changes in circulating steroid. Over the last several years, it has become clear that the concentration of steroid hormone required for half-maximal induction or repression by a given receptor-steroid complex, which is normally called the EC50, is not constant for all responsive genes. Thus, the position of the dose-response curve can change so that a single concentration of steroid produces very different percentages of maximal activity. This, in turn, allows for the differential expression of genes by a common steroid hormone concentration during development, differentiation, and homeostasis. Here we review the variety of factors that influence the EC50 and position of the dose-response curve for steroid hormone receptors, discuss what is known about the mechanisms, and highlight promising areas for future research.
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Cite this article as:
Simons Jr. S. S., How Much is Enough? Modulation of Dose-Response Curve for Steroid Receptor-Regulated Gene Expression by Changing Concentrations of Transcription Factor, Current Topics in Medicinal Chemistry 2006; 6 (3) . https://dx.doi.org/10.2174/156802606776173465
DOI https://dx.doi.org/10.2174/156802606776173465 |
Print ISSN 1568-0266 |
Publisher Name Bentham Science Publisher |
Online ISSN 1873-4294 |
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