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Intramural Research Support Program, Science Applications International Corporation-Frederick [T. C.] and Cytokine Molecular Mechanisms Section, Laboratory of Molecular Immunoregulation [L. H. W., W. L. F.], National Cancer Institute-Frederick Cancer Research and Development Center, Frederick, Maryland 21702
Interleukin 6 (IL-6) is a cytokine that regulates not only immune and inflammatory responses but also the growth of some tumors, including prostate carcinomas. IL-6 signals through Janus kinase, signal transducer and activator of transcription 3 (STAT3), and mitogen-activated protein kinase and is also able to induce androgen receptor (AR)-mediated gene activation in prostate cancer, which is an important process in prostate cancer androgen-independent progression. We now show that IL-6-induced AR-mediated gene activation requires the activation of STAT3 by IL-6 in LNCaP prostate cancer cells. In particular, STAT3 associates with AR in an androgen-independent but IL-6-dependent manner. Inhibition of STAT3 rather than mitogen-activated protein kinase results in inhibition of AR-mediated gene activation in response to IL-6. These findings not only identify STAT3 as an important signaling molecule required for IL-6-signaling to induce AR-mediated gene activation in prostate carcinoma cells but also reveal the importance of activated STAT3 in human tumor development and progression.
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A. Hobisch, R. Ramoner, D. Fuchs, S. Godoy-Tundidor, G. Bartsch, H. Klocker, and Z. Culig Prostate Cancer Cells (LNCaP) Generated after Long-Term Interleukin 6 (IL-6) Treatment Express IL-6 and Acquire an IL-6 Partially Resistant Phenotype Clin. Cancer Res., September 1, 2001; 7(9): 2941 - 2948. [Abstract] [Full Text] [PDF] |
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D.-L. Lin, M. C. Whitney, Z. Yao, and E. T. Keller Interleukin-6 Induces Androgen Responsiveness in Prostate Cancer Cells through Up-Regulation of Androgen Receptor Expression Clin. Cancer Res., June 1, 2001; 7(6): 1773 - 1781. [Abstract] [Full Text] [PDF] |
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C. L. Campbell, Z. Jiang, D. M. F. Savarese, and T. M. Savarese Increased Expression of the Interleukin-11 Receptor and Evidence of STAT3 Activation in Prostate Carcinoma Am. J. Pathol., January 1, 2001; 158(1): 25 - 32. [Abstract] [Full Text] [PDF] |
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