Abstract
Androgen receptor (AR) is expressed in recurrent prostate cancer and its increased activation could be a consequence of protein stabilization, point mutations, and interaction with nonsteroidal compounds. One of the molecules which activate the androgen receptor in a ligand-independent and synergistic manner is the proinflammatory cytokine interleukin-6 (IL-6). IL-6 regulates prostate growth in an autocrine and paracrine manner. AR activation by IL-6 has different consequences for LNCaP and MDA PCa 2b cells. Whereas LNCaP cells are inhibited by IL-6, in vitro and in vivo growth of MDA PCa 2b cells is enhanced by the cytokine. AR activation by IL-6 is mediated by coactivators p300 and SRC-1 which are both expressed in prostate cancer tissues. Recent studies on suppressors of cytokine signaling and protein inhibitors of activated STAT revealed that there are several complex interactions between the pathways of IL-6 and androgen. Suppressor of cytokine signaling-3 is upregulated by IL-6 and response to androgenic hormones. The IL-6/AR axis is a target for novel therapies in prostate cancer. The monoclonal anti-IL-6 antibody siltuximab could delay progression of an androgen-sensitive xenograft. However, in clinical studies siltuximab was used mostly in the late stage disease in which it did not show clinical activity as a monotherapy.
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Culig, Z. (2013). Androgen-Independent Induction of Androgen-Responsive Genes by Interleukin-6 Regulation. In: Wang, Z. (eds) Androgen-Responsive Genes in Prostate Cancer. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-6182-1_11
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DOI: https://doi.org/10.1007/978-1-4614-6182-1_11
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