Abstract
Prostate cancer (CaP) progresses from prostatic intraepithelial neoplasia through locally invasive adenocarcinoma to castration-resistant metastatic carcinoma1. Although radical prostatectomy, radiation and androgen ablation are effective therapies for androgen-dependent CaP, metastatic castration-resistant CaP is a major complication with high mortality2. Androgens stimulate growth and survival of prostate epithelium and early CaP. Although most patients initially respond to androgen ablation, many develop castration-resistant CaP within 12–18 months2. Despite extensive studies, the mechanisms underlying the emergence of castration-resistant CaP remain poorly understood and their elucidation is critical for developing improved therapies. Curiously, castration-resistant CaP remains androgen-receptor dependent, and potent androgen-receptor antagonists induce tumour regression in castrated mice3. The role of inflammation in castration-resistant CaP has not been addressed, although it was reported that intrinsic NF-κB activation supports its growth4. Inflammation is a localized protective reaction to injury or infection, but it also has a pathogenic role in many diseases, including cancer5. Whereas acute inflammation is critical for host defence, chronic inflammation contributes to tumorigenesis and metastatic progression. The inflammation-responsive IκB kinase (IKK)-β and its target NF-κB have important tumour-promoting functions within malignant cells and inflammatory cells6. The latter, including macrophages and lymphocytes, are important elements of the tumour microenvironment7,8,9, but the mechanisms underlying their recruitment remain obscure, although they are thought to depend on chemokine and cytokine production10. We found that CaP progression is associated with inflammatory infiltration and activation of IKK-α, which stimulates metastasis by an NF-κB-independent, cell autonomous mechanism11. Here we show that androgen ablation causes infiltration of regressing androgen-dependent tumours with leukocytes, including B cells, in which IKK-β activation results in production of cytokines that activate IKK-α and STAT3 in CaP cells to enhance hormone-free survival.
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Acknowledgements
We thank C. Sawyers for myc-CaP cells, L. Coussens for JH–/– (FVB) mice, Y. X. Fu for LTβR-Ig fusion protein, R. Rickert for help with B-cell phenotyping, H. Cheroutre for flow cytometer use and C. Ware for bone marrow. M.A. was supported by Fondazione Italiana per la Ricerca sul Cancro and American-Italian Cancer Foundation fellowships. J.-L.L. was supported by a Life Science Research Fellowship. Work in M.K.’s laboratory was supported by grants from the National Institutes of Health, the US Army Medical Research and Material Command and Prostate Cancer Foundation. M.K. is an American Cancer Society Research Professor.
Author Contributions M.A., J.-L.L. and M.K. designed the study; M.A., J.-L.L. and S.G. performed research; S.N. provided lymphotoxin-deficient mice; M.A. and M.K. analysed data and wrote the paper.
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Ammirante, M., Luo, JL., Grivennikov, S. et al. B-cell-derived lymphotoxin promotes castration-resistant prostate cancer. Nature 464, 302–305 (2010). https://doi.org/10.1038/nature08782
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DOI: https://doi.org/10.1038/nature08782
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