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Related Experiment Videos

Microarray analysis of 1alpha,25-dihydroxyvitamin D3-treated MC3T3-E1 cells.

Guy Eelen1, Lieve Verlinden, Mark Van Camp

  • 1Laboratorium voor Experimentele Geneeskunde en Endocrinologie (LEGENDO), Onderwijs en Navorsing, 9th Floor, Gasthuisberg, K.U. Leuven, Herestraat 49, B-3000 Leuven, Belgium.

The Journal of Steroid Biochemistry and Molecular Biology
|July 1, 2004
PubMed
Summary

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The active form of Vitamin D, 1alpha,25-dihydroxyvitamin D(3) [1,25-(OH)(2)D(3)], inhibits cell proliferation by down-regulating DNA replication genes. This study identifies key genes involved in the G1/S cell cycle arrest induced by 1,25-(OH)(2)D(3).

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • The active form of Vitamin D, 1alpha,25-dihydroxyvitamin D(3) [1,25-(OH)(2)D(3)], exhibits antiproliferative effects on various cell types.
  • The precise molecular mechanisms and target genes underlying this non-classic effect, particularly the G1/S cell cycle arrest, are not fully understood.

Purpose of the Study:

  • To identify genes whose expression is altered by 1,25-(OH)(2)D(3) treatment.
  • To elucidate the role of these genes in the antiproliferative action and G1/S cell cycle blockade.

Main Methods:

  • Gene expression profiling using cDNA microarrays with 4600 genes.
  • Treatment of MC3T3-E1 mouse osteoblasts with 1,25-(OH)(2)D(3) at 10(-8)M for 6 and 12 hours.
  • Quantitative RT-PCR validation of gene expression changes.

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Main Results:

  • A significant down-regulation of genes involved in DNA replication was observed 12 hours after 1,25-(OH)(2)D(3) treatment.
  • Approximately one-fifth of the down-regulated genes were related to DNA replication processes.
  • Quantitative RT-PCR confirmed the down-regulation of these DNA replication genes.

Conclusions:

  • 1,25-(OH)(2)D(3) treatment leads to the down-regulation of DNA replication genes in MC3T3-E1 cells.
  • This down-regulation occurs in parallel with the G1/S cell cycle arrest, suggesting a key role in the antiproliferative effect.