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Supplementary Methods and Figure Legend from Loss of Androgen Receptor Expression Promotes a Stem-like Cell Phenotype in Prostate Cancer through STAT3 Signaling

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posted on 2023-03-30, 22:25 authored by Anne Schroeder, Andreas Herrmann, Gregory Cherryholmes, Claudia Kowolik, Ralf Buettner, Sumanta Pal, Hua Yu, Gerhard Müller-Newen, Richard Jove

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ARTICLE ABSTRACT

Androgen receptor (AR) signaling is important for prostate cancer progression. However, androgen-deprivation and/or AR targeting-based therapies often lead to resistance. Here, we demonstrate that loss of AR expression results in STAT3 activation in prostate cancer cells. AR downregulation further leads to development of prostate cancer stem-like cells (CSC), which requires STAT3. In human prostate tumor tissues, elevated cancer stem-like cell markers coincide with those cells exhibiting high STAT3 activity and low AR expression. AR downregulation-induced STAT3 activation is mediated through increased interleukin (IL)-6 expression. Treating mice with soluble IL-6 receptor fusion protein or silencing STAT3 in tumor cells significantly reduced prostate tumor growth and CSCs. Together, these findings indicate an opposing role of AR and STAT3 in prostate CSC development. Cancer Res; 74(4); 1227–37. ©2013 AACR.

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