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Expression analysis of a subset of coregulators and three nuclear receptors in human colorectal carcinoma

Romina Giannini1, Aldo Cavallini

  • 1Laboratory of Biochemistry, National Institute for Digestive Diseases, I.R.C.C.S. Saverio de Bellis, 70013-Castellana Grotte, BA, Italy.

Anticancer Research
|November 29, 2005
PubMed

Insights

Estrogen receptor (ER) coactivators and corepressors show altered gene expression in colorectal tumors. ERbeta coactivator levels correlate with tumor development, suggesting a role in human colorectal carcinoma.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genetics

Background:

  • Estrogen receptors (ERs) play a role in various cellular processes, including cancer development.
  • Coactivators and corepressors modulate ER activity and are implicated in tumorigenesis.
  • Understanding the expression patterns of ER-associated cofactors in colorectal cancer is crucial for elucidating disease mechanisms.

Purpose of the Study:

  • To investigate the gene expression profiles of ER-associated coactivators and corepressors in human colorectal tissues.
  • To determine the correlation between ER cofactors and colorectal tumor development.
  • To explore the potential role of ER cofactors in human colorectal carcinoma.

Main Methods:

  • Traditional Reverse Transcription Polymerase Chain Reaction (RT-PCR) was used to identify coactivator and corepressor gene expression.
  • Real-time PCR quantified mRNA levels of ER cofactors (ERalpha, ERbeta, ERRalpha) in matched tumor and normal colorectal tissues.
  • Statistical analysis examined correlations between cofactor gene expression and clinicopathological parameters.

Main Results:

  • Gene expression of coactivators generally decreased, while corepressors (NCoR, HDAC1, HDAC2, MTA1) increased from normal to tumor colorectal tissue.
  • REA, HDAC3, and MTA1L1 expression levels remained similar between normal and tumor tissues.
  • ERbeta gene expression correlated with p300, TIF-2, and REA in normal mucosa, and with REA in tumor tissue.

Conclusions:

  • Altered expression of ER-associated coactivators and corepressors is observed in colorectal cancer.
  • The co-induction of ERbeta and specific cofactors may be significant in human colorectal carcinoma development.
  • No association was found between ERalpha and coregulators or between coregulators and clinical parameters.

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