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Updated: Sep 20, 2026

In vivo Application of the REMOTE-control System for the Manipulation of Endogenous Gene Expression
08:54

In vivo Application of the REMOTE-control System for the Manipulation of Endogenous Gene Expression

Published on: March 29, 2019

A novel vitamin D-regulated immediate-early gene, IEX-1, alters cellular growth and apoptosis

Rajiv Kumar1, Mark R Pittelkow, Jeffrey L Salisbury

  • 1Department of Medicine, Mayo Clinic and Foundation, 911A Guggenheim Building, 200 First Street S.W., Rochester, MN 55905, USA. rkumar@mayo.edu

Recent Results in Cancer Research. Fortschritte Der Krebsforschung. Progres Dans Les Recherches Sur Le Cancer
|August 6, 2003
PubMed

Insights

1alpha,25-Dihydroxyvitamin D3 inhibits the immediate-early gene IEX-1 expression and alters its nuclear localization. This vitamin D3 action affects cellular growth and apoptosis by reducing IEX-1 messenger RNA levels.

Area of Science:

  • Molecular biology
  • Cell biology
  • Endocrinology

Background:

  • Immediate-early genes, such as IEX-1, play crucial roles in regulating cellular processes like growth and apoptosis.
  • 1alpha,25-Dihydroxyvitamin D3 (1alpha,25(OH)2D3) is a biologically active form of vitamin D with known regulatory functions in various cell types.

Purpose of the Study:

  • To investigate the effect of 1alpha,25(OH)2D3 on the expression and cellular localization of the IEX-1 gene.
  • To elucidate the molecular mechanisms by which 1alpha,25(OH)2D3 regulates IEX-1.

Main Methods:

  • Analysis of IEX-1 gene expression levels.
  • Assessment of subcellular localization of IEX-1 protein.
  • Investigation of IEX-1 messenger RNA regulation.

Main Results:

  • 1alpha,25(OH)2D3 significantly inhibits the expression of IEX-1 in various cells.
  • 1alpha,25(OH)2D3 treatment causes the efflux of IEX-1 from the nucleus to the cytoplasm.
  • The sterol reduces IEX-1 messenger RNA levels through a novel DR3 repeat-type DNA response element.

Conclusions:

  • 1alpha,25(OH)2D3 is a potent inhibitor of IEX-1 expression.
  • Vitamin D3 modulates IEX-1 function by altering its subcellular distribution and mRNA levels.
  • These findings provide insights into the molecular mechanisms underlying vitamin D's role in cellular regulation.

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