Journal
CLINICA CHIMICA ACTA
Volume 380, Issue 1-2, Pages 145-150Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cca.2007.01.031
Keywords
selenium; IL-6; prostate cancer; c-Jun; androgen independent growth
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Funding
- NCI NIH HHS [CA89000, R01 CA088900-04] Funding Source: Medline
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Background: It has been suggested that interleukin-6 (IL-6) may modulate androgen receptor (AR) action to accelerate prostate cancer (PCa) progression. Selenium compounds are highly recommended as a promising chemopreventive agent for PCa. This study was to determine if selenium can repress IL-6 mediated AR action in PCa progression. Methods: Cell proliferation, prostate-specific antigen, gene transfer, and Western blot assays were used to study the effects of sodium selenite and methylseleninic acid on IL-6 mediated AR action on an AR expressing human prostate cancer cell line, LNCaP. Results: We found that sodium selenite, but not methylseleninic acid, significantly (p<0.05) inhibited IL-6-induced trans-activating activity of AR and cell proliferation in LNCaP cells. Interestingly, although sodium selenite did not show effect on activation of both STAT3 and ERK1/2 in the presence of IL-6, an increased expression of c-Jun was detected in cells after treatment with sodium selenite. Indeed, we showed overexpression of c-Jun blocked IL-6-induced AR activation. Conclusions: Taken together, our results suggest that sodium selenite not methylseleninic acid can inhibit IL-6-mediated AR activation by increased c-Jun in LNCaP cells. Sodium selenite may be a proper selenium form for further testing its potency on intervening IL-6-mediated PCa progression. (c) 2007 Elsevier B.V. All rights reserved.
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