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IL-6 Inhibits the Targeted Modulation of PDCD4 by miR-21 in Prostate Cancer

Biao Dong1, Zhihao Shi2, Jiaping Wang3

  • 1Department of Urology, the Second Hospital of Kunming Medical University, Kunming, Yunnan, China; Urology Institute of Yunnan Province, Kunming, Yunnan, China.

Plos One
|August 8, 2015
PubMed

Insights

Interleukin-6 (IL-6) inhibits prostate cancer suppressor PDCD4 gene expression via microRNA miR-21. This IL-6/miR-21/PDCD4 pathway offers potential for prostate cancer diagnosis and gene therapy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Regulation

Background:

  • Prostate cancer is a leading cancer in men.
  • The cytokine Interleukin-6 (IL-6) influences prostate cancer progression.
  • The upstream trans-signaling pathway of IL-6 in prostate cancer requires further elucidation.

Purpose of the Study:

  • To investigate the role of IL-6 in regulating PDCD4 (Programmed Cell Death 4) gene expression.
  • To determine how microRNA miR-21 mediates the effect of IL-6 on PDCD4.
  • To analyze PDCD4 expression patterns in human prostate cancer tissues.

Main Methods:

  • Immunohistochemistry to assess PDCD4 expression in human tissue samples.
  • Quantitative real-time PCR (qRT-PCR) for PDCD4 mRNA levels.
  • Western blot analysis for PDCD4 protein levels.
  • In vitro studies in PC-3 and LNCaP prostate cancer cell lines using anti-miR-21 constructs and IL-6 treatment.

Main Results:

  • PDCD4 expression increased progressively across benign, precancerous, and cancerous prostate tissues.
  • PDCD4 expression was negatively correlated with prostate-specific antigen (PSA) levels.
  • Inhibition of miR-21 led to decreased PDCD4 mRNA and protein levels.
  • IL-6 inhibited PDCD4 expression, an effect dependent on miR-21 levels.

Conclusions:

  • miR-21 directly targets and regulates PDCD4 expression in prostate cancer cells.
  • IL-6 inhibits PDCD4 gene expression through the miR-21 pathway.
  • The IL-6/miR-21/PDCD4 axis presents a potential therapeutic target for prostate cancer treatment and diagnosis.

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