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E-cadherin is regulated by the transcriptional repressor SLUG during Ras-mediated transformation of intestinal

Carl R Schmidt1, Y J Gi, Trusharth A Patel

  • 1Department of Veterans Affairs, Tennessee Valley Healthcare System, Nashville, USA.

Surgery
|September 13, 2005
PubMed
Abstract

Insights

Ras signaling triggers the loss of E-cadherin in intestinal cells by increasing SLUG, a transcriptional repressor. Silencing SLUG restores E-cadherin and partially reverses the transformed cell phenotype.

Area of Science:

  • Molecular biology
  • Cell biology
  • Cancer research

Background:

  • Loss of E-cadherin, a cell membrane protein, is crucial in Ras-mediated intestinal epithelial cell transformation.
  • Investigating the role of the transcriptional repressor SLUG in Ras-induced E-cadherin loss.

Purpose of the Study:

  • To determine if SLUG activation is a key mechanism in Ras-induced E-cadherin loss.
  • To elucidate the role of SLUG in Ras-mediated intestinal epithelial cell transformation.

Main Methods:

  • Engineered rat intestinal epithelial (RIE) cells to express mutated human Ha-Ras(Val12).
  • Analyzed cell morphology, RNA, and protein expression via microscopy, RT-PCR, and Western blot.
  • Utilized short interfering RNA (siRNA) to knock down SLUG expression.

Main Results:

  • Oncogenic Ras upregulates SLUG, leading to E-cadherin downregulation.
  • SLUG gene silencing via siRNA restores E-cadherin expression.
  • Reexpression of E-cadherin partially rescues the transformed cell phenotype.

Conclusions:

  • Ras signaling promotes a malignant phenotype by upregulating transcriptional repressors like SLUG, causing E-cadherin downregulation.
  • This mechanism highlights a pathway for Ras-induced E-cadherin loss and malignant transformation.

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