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Renin-angiotensin system is an important factor in hormone refractory prostate cancer

Hiroji Uemura1, Hisashi Hasumi, Hitoshi Ishiguro

  • 1Department of Urology, Yokohama City University Graduate School of Medicine, Yokohama, Japan. hu0428@med.yokohama-cu.ac.jp

The Prostate
|February 17, 2006
PubMed
Abstract

Insights

The renin-angiotensin system (RAS) is overexpressed in hormone-refractory prostate cancer (HRPC). Hormonal stimulation influences the expression of RAS components in prostate cancer, suggesting a role in disease progression.

Area of Science:

  • Endocrinology
  • Oncology
  • Molecular Biology

Background:

  • The renin-angiotensin system (RAS) plays a role in various physiological processes.
  • Prostate cancer is a significant health concern, and its underlying molecular mechanisms require further elucidation.

Purpose of the Study:

  • To comprehensively evaluate the renin-angiotensin system (RAS) in prostate cancer.
  • To investigate the expression of RAS components in prostate cancer cells under hormonal influence.

Main Methods:

  • Real-time PCR was used to analyze the expression of RAS components (AT1 receptor, ACE, Ang-I/II precursor) in 87 prostate tissue samples.
  • Western blot analysis assessed protein expression of the AT1 receptor and Ang-I/II in LNCaP cells under varying hormonal conditions (steroid-free medium, DHT, E2, DEX, anti-androgen drugs).

Main Results:

  • RAS components were detected in all prostate tissue samples.
  • Gene expression of AT1 receptor, ACE, and Ang-I/II precursor was significantly higher in hormone-refractory prostate cancer (HRPC) compared to normal and untreated prostate cancer tissues.
  • Protein expression of the AT1 receptor and Ang-I/II was upregulated in LNCaP cells cultured in steroid-free medium and further augmented upon stimulation with androgens, estrogens, glucocorticoids, and anti-androgen drugs.

Conclusions:

  • Prostatic RAS is overexpressed in HRPC tissue.
  • Hormonal stimulation significantly influences the expression of RAS components in prostate cancer.
  • These findings suggest a potential role for prostatic RAS in prostate cancer progression, particularly in hormone-refractory cases.

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