Abstract
The healthy human prostate accumulates the highest level of zinc of any soft tissue in the body. This unique property is retained in BPH, but is lost in prostatic malignancy, which implicates changes in zinc and its transporters in carcinogenesis. Indeed, zinc concentrations diminish early in the course of prostate carcinogenesis, preceding histopathological changes, and continue to decline during progression toward castration-resistant disease. Numerous studies suggest that increased zinc intake might protect against progression of prostatic malignancy. In spite of increased dietary intake, zinc accumulation might be limited by the diminished expression of zinc uptake transporters, resulting in decreased intratumoural zinc levels. This finding can explain the conflicting results of various epidemiological studies evaluating the role of zinc supplementation on primary and secondary prostate cancer prevention. Overall, more research into the mechanisms of zinc homeostasis are needed to fully understand its impact on prostate carcinogenesis. Only then can the potential of zinc and zinc transport proteins be harnessed in the diagnosis and treatment of men with prostate cancer.
Key Points
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In vitro and in vivo experimental studies have revealed a strong association between prostate cancer and the downregulation of intracellular zinc content
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To escape the antitumour effects of intracellular zinc, malignant prostate cells can reduce expression of zinc uptake transporters through multiple mechanisms
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Failure to accumulate zinc via the diminished expression of zinc uptake transporters can, in turn, result in decreased intratumoural zinc levels despite adequate dietary zinc intake
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This finding can explain the conflicting results of various epidemiological studies evaluating the role of zinc supplementation on primary and secondary prostate cancer prevention
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The importance of changes in zinc accumulation in prostate carcinogenesis emphasizes the potential roles of zinc and zinc transport proteins for the development of novel diagnostic and therapeutic modalities
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Acknowledgements
This work was supported in part by the National Institutes of Health Grants (RO1 CA134463, RO3 CA167671, CCSG, P30 CA006927) to V. Kolenko, the American Institute for Cancer Research Grant (09A023) to R. Uzzo and the Department of Defense Physician Research Training Award (W81XWH-10-1-0187) and Bucks County Board of Associates Award to A. Kutikov.
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V. Kolenko and A. Kutikov researched the data for the article. A. Kutikov and R. Uzzo discussed the article's content. V. Kolenko and E. Teper wrote the manuscript, after which V. Kolenko and R. Uzzo edited the manuscript before submission.
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Kolenko, V., Teper, E., Kutikov, A. et al. Zinc and zinc transporters in prostate carcinogenesis. Nat Rev Urol 10, 219–226 (2013). https://doi.org/10.1038/nrurol.2013.43
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DOI: https://doi.org/10.1038/nrurol.2013.43
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