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Dysregulated post-transcriptional control of COX-2 gene expression in cancer

Dan A Dixon1

  • 1Surgical Oncology Research Laboratory, Departments of Surgery and Cancer Biology, Vanderbilt University Medical Center, Nashville, TN 37232-2733, USA. dan.dixon@vanderbilt.edu

Current Pharmaceutical Design
|February 18, 2004
PubMed

Insights

Dysregulated post-transcriptional control of cyclooxygenase-2 (COX-2) gene expression, via its 3'-untranslated region AU-rich element (ARE), promotes overexpression and is key in colorectal cancer development.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Gene Regulation

Background:

  • Cyclooxygenase-2 (COX-2) is crucial for prostaglandin synthesis in disease.
  • COX-2 gene expression is tightly regulated transcriptionally and post-transcriptionally.
  • Dysregulation leads to COX-2 overexpression, a driver of carcinogenesis, especially colorectal cancer.

Purpose of the Study:

  • To investigate the role of post-transcriptional regulation in COX-2 gene expression.
  • To understand how the AU-rich element (ARE) in the COX-2 3 -untranslated region (3 UTR) controls gene expression.
  • To elucidate the link between dysregulated COX-2 expression and neoplasia.

Main Methods:

  • Analysis of COX-2 gene regulation at the post-transcriptional level.
  • Investigation of the AU-rich element (ARE) in the COX-2 3 UTR.
  • Study of RNA-binding proteins interacting with the COX-2 ARE.
  • Examination of mRNA decay and translational control mechanisms.

Main Results:

  • Post-transcriptional regulation significantly controls COX-2 expression.
  • The COX-2 ARE mediates rapid mRNA decay and translational inhibition.
  • ARE RNA-binding proteins regulate COX-2 mRNA fate (degradation, stabilization, translation).
  • Dysregulation of these mechanisms results in COX-2 overexpression.

Conclusions:

  • Post-transcriptional regulation, particularly via the COX-2 ARE, is critical for controlling COX-2 levels.
  • Aberrant regulation of COX-2 mRNA decay and translation contributes to overexpression in cancer.
  • Understanding these mechanisms offers insights into colorectal tumorigenesis and potential therapeutic targets.

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