Journal
BRITISH JOURNAL OF CANCER
Volume 109, Issue 4, Pages 983-993Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/bjc.2013.396
Keywords
prostate cancer; anti-androgen; oxidation
Categories
Funding
- University of Cambridge
- Cancer Research UK
- Hutchison Whampoa Limited
- National Institute for Health Research (NIHR)
- NCRI (ProMPT)
- Prostate Cancer UK
- Medical Research Council
- MRC [G0900871] Funding Source: UKRI
- Cancer Research UK [22310, 19556] Funding Source: researchfish
- Medical Research Council [G0900871] Funding Source: researchfish
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Objective: We have previously identified peroxiredoxin-3 (PRDX-3) as a cell-surface protein that is androgen regulated in the LNCaP prostate cancer (PCa) cell line. PRDX-3 is a member of the peroxiredoxin family that are responsible for neutralising reactive oxygen species. Experimental design: PRDX-3 expression was examined in tissue from 32 patients using immunohistochemistry. Subcellular distribution was determined using confocal microscopy. PRDX-3 expression was determined in antiandrogen-resistant cell lines by western blotting and quantitative RT-PCR. The pathways of PRDX-3 overexpression and knockdown on apoptosis and response to oxidative stress were investigated using protein arrays. Results: PRDX-3 is upregulated in a number of endocrine-regulated tumours; in particular in PCa and prostatic intraepithelial neoplasia. Although the majority of PRDX-3 is localised to the mitochondria, we have confirmed that PRDX-3 at the cell membrane is androgen regulated. In antiandrogen-resistant LNCaP cell lines, PRDX-3 is upregulated at the protein but not RNA level. Resistant cells also possess an upregulation of the tricarboxylic acid (TCA) pathway and resistance to H2O2-induced apoptosis through a failure to activate pro-apoptotic pathways. Knockdown of PRDX-3 restored H2O2 sensitivity. Conclusion: Our results suggest that PRDX-3 has an essential role in regulating oxidation-induced apoptosis in antiandrogen-resistant cells. PRDX-3 may have potential as a therapeutic target in castrate-independent PCa.
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