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Messenger RNAs under differential translational control in Ki-ras-transformed cells

Jean Spence1, Brendan M Duggan, Colleen Eckhardt

  • 1Sidney Kimmel Cancer Center, San Diego, CA, USA. jlspence@san.rr.com

Molecular Cancer Research : MCR
|February 1, 2006
PubMed

Insights

This study reveals that cancer development involves significant changes in how genes are translated into proteins, not just transcribed. Researchers identified specific mRNA targets regulated at the translation level, offering new insights into oncogenesis.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Translational Control

Background:

  • Gene expression changes are crucial in cancer.
  • While transcriptional control is well-studied, translational control's role in oncogenesis is increasingly recognized.
  • Understanding translational regulation provides new avenues for cancer therapy.

Purpose of the Study:

  • To identify mRNA transcripts differentially regulated at the translational level during oncogenic transformation.
  • To compare translational profiles between normal and v-Ki-ras-transformed prostate epithelial cells.
  • To elucidate mechanisms governing translational control in cancer.

Main Methods:

  • Utilized Affymetrix oligonucleotide microarrays to compare total mRNA and polysome-bound mRNA.
  • Analyzed mRNA from an immortalized human prostate cell line (267B1) and its v-Ki-ras-transformed counterpart.
  • Investigated RNA-binding proteins and conserved motifs in untranslated regions of mRNAs.

Main Results:

  • Identified differentially translated transcripts encoding proteins involved in DNA replication, cell cycle, cell adhesion, and signaling pathways.
  • Observed differential expression of RNA-binding proteins.
  • Found Alu sequences associated with increased translation in transformed cells.
  • Discovered a conserved motif in 3' UTRs linked to decreased polysome association for specific genes (ephrinB1, calreticulin, integrin alpha3, mucin3B).

Conclusions:

  • Translational control plays a significant role in oncogenic transformation.
  • Specific mRNA motifs and RNA-binding proteins are involved in regulating translation during cancer development.
  • Findings highlight potential therapeutic targets by modulating translational control in cancer.

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