Single nucleotide polymorphisms and type of steroid impact the functional response of the human glucocorticoid receptor

Aaron C. Baker, Victoria W. Chew, Tajia L. Green, Kelly Tung, Debora Lim, Kiho Cho, David G Greenhalgh

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Background: Clinical trials evaluating the use of steroids in septic shock have shown variable outcomes. Our previous studies have implicated human glucocorticoid receptor (hGR) polymorphisms as a possible cause of altered steroid response. To further evaluate this variability, we hypothesized that hGR polymorphisms along with type of steroid influence the functional response. Methods: Total RNA was isolated from healthy human blood samples and surveyed for the hGR gene. The National Center for Biotechnology Information hGRα sequence was used as a reference, and two unique single nucleotide polymorphisms (SNPs) (A214G and T962C) were selected for evaluation. Functional response was measured using a luciferase reporting assay after transfecting hGR isoforms into tsA201 cells and stimulation with graded concentrations of hydrocortisone (HYD), methylprednisolone (MPS), and dexamethasone (DEX). Results: Each isoform had a unique dose-response curve with the optimal activity depending on concentration and type of steroid. The presence of either SNP A214G or T962C resulted in a decreased response when compared with hGRα when stimulated with HYD (P < 0.01). The same decreased response occurred for the SNPs with DEX stimulation, but at a much lower concentration range than HYD (P < 0.01). However, in the presence of MPS, SNP A214G resulted in greater activity when compared with hGRα (P < 0.01), whereas the presence of T962C resulted in activity equivalent to hGRα. Conclusions: SNPs, type of steroid, and concentration range impact the functional response of the hGR. A greater understanding of hGR polymorphisms and steroid response may further elucidate mechanisms explaining the variable response seen with patient treatment.

Original languageEnglish (US)
Pages (from-to)27-34
Number of pages8
JournalJournal of Surgical Research
Volume180
Issue number1
DOIs
StatePublished - Mar 2013

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Keywords

  • hGR
  • hGR NS-1
  • Human glucocorticoid receptor
  • Human glucocorticoid receptor response
  • Single nucleotide polymorphisms
  • SNPs
  • Steroid response
  • Stress response

ASJC Scopus subject areas

  • Surgery

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