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Regulation of PTEN expression in intestinal epithelial cells by c-Jun NH2-terminal kinase activation and nuclear

Qingding Wang1, Yuning Zhou, Xiaofu Wang

  • 1Department of Surgery, The University of Texas Medical Branch, Galveston, Texas 77555-0536, USA.

Cancer Research
|August 19, 2007
PubMed

Insights

Sodium butyrate (NaBT) increases tumor suppressor PTEN expression in colon cancer cells via JNK and NF-kappaB pathways. This regulates cell differentiation and death, crucial for intestinal homeostasis and preventing colon cancer.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Biology

Background:

  • The tumor suppressor PTEN is vital for intestinal cell growth, differentiation, and tumor suppression.
  • Molecular mechanisms controlling PTEN expression remain largely unknown.

Purpose of the Study:

  • To investigate the molecular mechanisms regulating PTEN expression in colon cancer cells.
  • To elucidate the roles of JNK and NF-kappaB signaling pathways in PTEN regulation.

Main Methods:

  • Utilized the HT29 colon cancer cell line.
  • Treated cells with sodium butyrate (NaBT), a differentiating agent.
  • Employed chemical and genetic inhibition of JNK and NF-kappaB pathways.
  • Assessed PTEN protein and mRNA levels, JNK activation, and p27(kip1) expression.

Main Results:

  • NaBT treatment increased PTEN expression and JNK activation in HT29 cells.
  • Inhibition of JNK attenuated NaBT-induced PTEN expression.
  • Cross-talk between NF-kappaB and JNK pathways was observed, influencing PTEN regulation.
  • PTEN and NaBT treatment upregulated p27(kip1), a process dependent on JNK and PTEN activity.
  • PTEN plays a role in NaBT-induced cell death and differentiation.

Conclusions:

  • The JNK/PTEN and NF-kappaB/PTEN signaling pathways are critical regulators of PTEN expression.
  • These pathways are essential for maintaining intestinal homeostasis and preventing colon cancer progression.

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