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Hyperactive Human Glucocorticoid Receptor Isoforms and their Implications for the Stress Response
Michael V Lasker1, Stacey M Leventhal, Debora Lim
1Department of Surgery, University of California Davis Medical Center and Shriners Hospitals for Children Northern California, Sacramento, California.
Shock (Augusta, Ga.)
|November 14, 2014
Summary
Human glucocorticoid receptor (hGR) gene variations influence steroid effectiveness in critical conditions. Specific hGR polymorphisms affect treatment response, explaining patient variability in shock and inflammation.
Area of Science:
- Molecular biology
- Pharmacogenomics
- Endocrinology
Background:
- Glucocorticoids are vital anti-inflammatory drugs.
- Variable patient responses to glucocorticoid therapy, especially in septic shock, are poorly understood.
- Human glucocorticoid receptor (hGR) gene polymorphisms are suspected contributors to this variability.
Purpose of the Study:
- To investigate the functional impact of specific human glucocorticoid receptor (hGR) single-nucleotide polymorphisms (SNPs) on receptor activity.
- To determine how these hGR variants affect transactivation potential in the presence and absence of exogenous steroids.
Main Methods:
- Analysis of two single-nucleotide polymorphisms (SNPs) in the human glucocorticoid receptor (hGR) gene.
- Assessment of hGR transactivation potential in vitro.
- Comparison of hGR isoform activity with and without various steroid treatments.
Main Results:
- A novel hGR SNP (T1463C) resulted in a hyperactive response to all tested steroids, with low basal activity.
- A previously identified hGR SNP (A2297G) showed hyperactive basal activity and increased response to hydrocortisone only.
- These distinct functional profiles differentiate the impact of hGR polymorphisms on steroid responsiveness.
Conclusions:
- hGR gene polymorphisms significantly alter glucocorticoid receptor function.
- These genetic variations provide a molecular basis for the observed clinical variability in patient responses to glucocorticoid therapy.
- Understanding hGR SNP effects can personalize steroid treatment strategies for inflammatory conditions and shock.
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