Gene expression profiling following constitutive activation of MEK1 and transformation of rat intestinal epithelial cells

Koga Komatsu, F. Gregory Buchanan, Michiro Otaka, Mario Jin, Masaru Odashima, Yohei Horikawa, Sumio Watanabe, Raymond N. DuBois

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Background: Constitutive activation of MEK1 (caMEK) can induce the oncogenic transformation of normal intestinal epithelial cells. To define the genetic changes that occur during this process, we used oligonucleotide microarrays to determine which genes are regulated following the constitutive activation of MEK in normal intestinal epithelial cells. Results: Microarray analysis was performed using Affymetrix GeneChip and total RNA from doxycycline inducible RIEtiCAMEK cells in the presence or absence of doxycycline. MEK-activation induced at least a three-fold difference in 115 gene transcripts (75 transcripts were up-regulated, and 40 transcripts were down-regulated). To verify whether these mRNAs are indeed regulated by the constitutive activation of MEK, RT-PCR analysis was performed using the samples from caMEK expressing RIE cells (RIEcCAMEK cells) as well as RIEtiCAMEK cells. The altered expression level of 69 gene transcripts was confirmed. Sixty-one of the differentially expressed genes have previously been implicated in cellular transformation or tumorogenesis. For the remaining 8 genes (or their human homolog), RT-PCR analysis was performed on RNA from human colon cancer cell lines and matched normal and tumor colon cancer tissues from human patients, revealing three novel targets (rat brain serine protease2, AMP deaminase 3, and cartilage link protein 1). Conclusion: Following MEK-activation, many tumor-associated genes were found to have significantly altered expression levels. However, we identified three genes that were differentially expressed in caMEK cells and human colorectal cancers, which have not been previously linked to cellular transformation or tumrogenesis.

Original languageEnglish (US)
Article number63
JournalMolecular Cancer
StatePublished - Nov 17 2006
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Medicine
  • Oncology
  • Cancer Research


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