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Cytokine profiling of docetaxel-resistant castration-resistant prostate cancer


BACKGROUND: Docetaxel improves symptoms and survival in metastatic castration-resistant prostate cancer (CRPC). However, approximately 50% of patients are chemoresistant. This study examined whether changes in cytokine levels predict for docetaxel resistance in vitro and in a clinical cohort. METHODS: PC3 cells or their docetaxel-resistant subline (PC3Rx) were co-cultured with U937 monocytes, with and without docetaxel treatment, and cytokine levels were measured. The circulating levels of 28 cytokines were measured pre-/post cycle 1 of docetaxel from 55 men with CRPC, and compared with prostate-specific antigen (PSA) response. RESULTS: PC3Rx-U937 co-culture expressed more cytokines, chiefly markers of alternative macrophage differentiation, compared with PC3-U937 co-culture. Docetaxel treatment enhanced cytokine production by PC3Rx-U937 co-culture, while reducing cytokine levels in PC3-U937. In patients, changes in the levels of seven circulating cytokines (macrophage inhibitory cytokine 1 (MIC1), interleukin (IL)-1ra, IL-1beta, IL-4, IL-6, IL-12 and IFNgamma) after cycle 1 of docetaxel were associated with progressive disease (all P<0.05). The combination of changes in MIC1, IL-4 and IL-6 most strongly predicted PSA response (P=0.002). CONCLUSIONS: In vitro studies suggest docetaxel resistance is mediated, at least in part, by cytokines induced by the interaction between the docetaxel-resistant tumour cells and macrophages. Early changes in circulating cytokine levels were associated with docetaxel resistance in CRPC patients. When considered together, these data suggest a significant role for the inflammatory response and macrophages in the development of docetaxel resistance in CRPC.

Type Journal
ISBN 1532-1827 (Electronic) 0007-0920 (Linking)
Authors Mahon, K. L.; Lin, H. M.; Castillo, L.; Lee, B. Y.; Lee-Ng, M.; Chatfield, M. D.; Chiam, K.; Breit, S. N.; Brown, D. A.; Molloy, M. P.; Marx, G. M.; Pavlakis, N.; Boyer, M. J.; Stockler, M. R.; Daly, R. J.; Henshall, S. M.; Horvath, L. G.;
Publisher Name British Journal of Cancer
Published Date 2015-01-01
Published Volume 112
Published Issue 8
Published Pages 1340-1348
Status Published in-print
URL link to publisher's version
OpenAccess link to author's accepted manuscript version