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World Journal of Urology

, Volume 36, Issue 2, pp 187–192 | Cite as

RANKL/RANK/OPG cytokine receptor system: mRNA expression pattern in BPH, primary and metastatic prostate cancer disease

  • Frank ChristophEmail author
  • Frank König
  • Steffen Lebentrau
  • Burkhard Jandrig
  • Hans Krause
  • Romy Strenziok
  • Martin Schostak
Original Article

Abstract

Background

The cytokine system RANKL (receptor activator of NF-κB ligand), its receptor RANK and the antagonist OPG (osteoprotegerin) play a critical role in bone turnover. Our investigation was conducted to describe the gene expression at primary tumour site in prostate cancer patients and correlate the results with Gleason Score and PSA level.

Methods

Seventy-one samples were obtained from prostate cancer patients at the time of radical prostatectomy and palliative prostate resection (n = 71). Patients with benign prostate hyperplasia served as controls (n = 60). We performed real-time RT-PCR after microdissection of the samples.

Results

The mRNA expression of RANK was highest in tumour tissue from patients with bone metastases (p < 0.001) as compared to BPH or locally confined tumours, also shown in clinical subgroups distinguished by Gleason Score (< 7 or ≥ 7, p = 0.028) or PSA level (< 10 or ≥ 10 µg/l, p = 0.004). RANKL and OPG mRNA expression was higher in tumour tissue from patients with metastatic compared to local disease. The RANKL/OPG ratio was low in normal prostate tissue and high tumours with bone metastases (p < 0.05). Expression of all three cytokines was high in BPH tissue but did not exceed as much as in the tumour tissue.

Conclusion

We demonstrated that RANK, RANKL and OPG are directly expressed by prostate cancer cells at the primary tumour site and showed a clear correlation with Gleason Score, serum PSA level and advanced disease. In BPH, mRNA expression is also detectable, but RANK expression does not exceed as much as compared to tumour tissue.

Keywords

Bone metastasis OPG (Osteoprotegerin) Prostate cancer RANK (Receptor activator of NF-κB ligand) RANKL 

Notes

Acknowledgements

The authors gratefully acknowledge the support Prof. Dr. André Schrattenholz, ProteoSys AG, Mainz, Germany.

Author contributions

FC: project development, manuscript writing, FK: manuscript writing, SL: manuscript editing, BJ: data analysis, HK: data analysis, RS: data collection, MS: manuscript editing.

Compliance with ethical standards

Conflict of interest

The author(s) declare that they have no competing interests.

Informed consent

Informed consent was obtained from all individual participants included in the study.

Ethical approval

All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  1. 1.Universitätsklinik für Urologie und Kinderurologie, Otto-von-Guericke-Universität, MagdeburgMagdeburgGermany
  2. 2.Klinik für Urologie und Kinderurologie, Ruppiner KlinikenNeuruppinGermany
  3. 3.Klinik für Urologie, Charité Universitätsmedizin Berlin, Campus Charité MitteBerlinGermany

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