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Tristetraprolin downregulates the expression of both VEGF and COX-2 in human colon cancer

Hee Jeong Cha1, Hyun Hee Lee, Seoung Wan Chae

  • 1Department of Pathology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.

Hepato-Gastroenterology
|August 12, 2011
PubMed
Abstract

Insights

Tristetraprolin (TTP) reduces vascular endothelial growth factor (VEGF) and cyclooxygenase-2 (COX-2) expression in colon cancer. Lower TTP levels correlate with increased VEGF and COX-2, suggesting TTP's role in colorectal carcinogenesis.

Area of Science:

  • Molecular Biology
  • Oncology
  • Biochemistry

Background:

  • Vascular endothelial growth factor (VEGF) and cyclooxygenase-2 (COX-2) are key drivers of angiogenesis and carcinogenesis.
  • The regulatory mechanisms of VEGF and COX-2 in cancer development are not fully understood.
  • Tristetraprolin (TTP), an AU-rich element-binding protein, is implicated in gene regulation.

Purpose of the Study:

  • To investigate the impact of tristetraprolin (TTP) on the expression of VEGF and COX-2 in human colon cancer cells.
  • To explore the role of TTP in the context of colorectal cancer development.

Main Methods:

  • Immunohistochemistry was used to analyze TTP, VEGF, and COX-2 expression in colorectal cancer specimens.
  • Colon cancer cells were transfected with reporter constructs linked to the 3'UTR of VEGF or COX-2.
  • Semiquantitative RT-PCR and luciferase assays assessed the effects of TTP overexpression on gene and protein expression.

Main Results:

  • TTP expression was significantly lower in colon cancer cells compared to non-malignant mucosa.
  • Conversely, COX-2 and VEGF expression was elevated in cancer cells.
  • Overexpression of TTP led to a marked decrease in both COX-2 and VEGF expression.
  • TTP inhibited luciferase activity linked to the 3'UTR of VEGF and COX-2 mRNA, indicating post-transcriptional regulation.

Conclusions:

  • Tristetraprolin (TTP) acts as an inhibitor of both VEGF and COX-2 expression in colon cancer.
  • Reduced TTP expression in colorectal cancer may contribute to the upregulation of VEGF and COX-2.
  • TTP represents a potential therapeutic target for modulating angiogenesis and carcinogenesis.

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