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Reduced tumor necrosis factor receptor-associated death domain expression is associated with prostate cancer

Diping Wang1, R Bruce Montgomery, Lucy J Schmidt

  • 1Department of Urology Research/Biochemistry, Mayo Clinic College of Medicine, Rochester, Minnesota 55905, USA.

Cancer Research
|November 26, 2009
PubMed

Insights

Androgen deprivation in prostate cancer may lead to tumor necrosis factor-alpha (TNF-alpha) resistance by reducing the expression of TRADD, a key protein in TNF-alpha signaling pathways.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Prostate cancer progression is often linked to hormone independence and resistance to therapies.
  • Tumor necrosis factor-alpha (TNF-alpha) is a cytokine involved in inflammation and cell death, with implications in cancer.
  • Androgen deprivation therapy (ADT) is a cornerstone treatment for prostate cancer, but resistance can develop.

Purpose of the Study:

  • To investigate the relationship between TNF-alpha resistance and hormone independence in prostate cancer.
  • To elucidate the role of tumor necrosis factor receptor-associated death domain (TRADD) in this process.
  • To determine if ADT influences TRADD expression and subsequent TNF-alpha sensitivity.

Main Methods:

  • Utilized LNCaP and its derivative cell lines, including androgen deprivation-dependent and -independent variants.
  • Assessed the expression levels of TRADD in different cell lines.
  • Manipulated TRADD expression (knockdown and overexpression) to study its effect on TNF-alpha-induced nuclear factor-kappaB (NF-kappaB) activation and androgen receptor (AR) signaling.
  • Examined TRADD expression in vitro and in vivo under androgen deprivation conditions.

Main Results:

  • Observed a correlation between TNF-alpha resistance and hormone independence in prostate cancer cell lines.
  • Found reduced TRADD expression in androgen deprivation-independent cells compared to dependent cells.
  • Knockdown of TRADD impaired TNF-alpha-induced NF-kappaB activation and AR repression in LNCaP cells.
  • Overexpression of TRADD in C4-2B cells restored sensitivity to TNF-alpha.
  • Demonstrated that androgen deprivation reduces TRADD expression both in vitro and in vivo.

Conclusions:

  • Androgen deprivation therapy may inadvertently promote TNF-alpha resistance in prostate cancer by downregulating TRADD expression.
  • Reduced TRADD expression compromises TNF-alpha-mediated NF-kappaB activation and AR repression, contributing to treatment resistance.
  • Targeting TRADD or its signaling pathway could be a potential strategy to overcome ADT resistance in prostate cancer.

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