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Analysis of Cell Cycle Position in Mammalian Cells
12:19

Analysis of Cell Cycle Position in Mammalian Cells

Published on: January 21, 2012

Expression of BRCC3, a novel cell cycle regulated molecule, is associated with increased phospho-ERK and cell

Howard E Boudreau1, Constantinos G Broustas, Prafulla C Gokhale

  • 1Department of Radiation Medicine, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington DC 20057, USA.

International Journal of Molecular Medicine
|December 5, 2006
PubMed

Insights

BRCC3 is a novel gene that regulates the ERK signaling pathway, impacting cell survival and proliferation. This study identifies BRCC3 as a key effector of Raf-1, influencing phospho-ERK levels in cancer cells.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Raf-1 kinase is crucial for cell survival and proliferation via the ERK pathway.
  • The regulation of phospho-ERK (p-ERK) by the Raf transcriptome is not well understood.
  • BRCC3, a novel gene, was identified through mRNA expression profiling in breast cancer cells.

Purpose of the Study:

  • To characterize the novel gene BRCC3.
  • To investigate the role of BRCC3 in the Raf-1 signaling pathway.
  • To determine BRCC3's influence on p-ERK, cell survival, and proliferation.

Main Methods:

  • mRNA expression profiling in MDA-MB 231 breast cancer cells.
  • siRNA-mediated knockdown of Raf-1 and BRCC3.
  • Ectopic expression of BRCC3 cDNA in multiple cell lines.
  • Cell cycle analysis and assessment of etoposide-induced cell death.

Main Results:

  • BRCC3 expression is high during the G2/M phase of the cell cycle.
  • Raf-1 siRNA decreased expression of Raf-1, BRCC3, and p-ERK.
  • BRCC3 expression correlated with increased p-ERK, delayed cell death, and enhanced proliferation.
  • BRCC3 siRNA treatment reduced BRCC3 and p-ERK levels.

Conclusions:

  • BRCC3 is a novel effector of Raf-1 kinase.
  • BRCC3 plays a significant role in modulating p-ERK signaling.
  • BRCC3 is implicated in regulating cell survival and proliferation in cancer cells.

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