Estrogen induces androgen-repressed SOX4 expression to promote progression of prostate cancer cells

The Prostate
Muyi YangBo Han


The sex determing region Y-box 4 (SOX4) gene is a critical developmental transcriptional factor that is overexpressed in prostate cancer (PCa). While we and others have investigated the role of SOX4 overexpression in PCa, the molecular mechanism underlying its aberrant expression remains unclear. Immunohistochemistry were utilized to detect SOX4 expression and the correlation between estrogen receptor β (ERβ), androgen receptor (AR) and SOX4 in a cohort of 94 clinical specimens. Real-time quantitative PCR and Western blotting were used to study the transcript and protein expression levels. Immunofluorescence staining and co-immunoprecipitation were performed to assess the interaction and subcellular location of ERβ and AR. Chromatin immunoprecipitation (ChIP) assays and Luciferase reporter assays were performed to explore the binding and transcriptional activities of ERβ and AR to the SOX4 promoter. Cellular function was evaluated by MTS, invasion and wound healing assays. SOX4 expression is up-regulated in Castration-Resistant Prostate Cancer (CRPC) tumors compared to hormone-dependent PCa (HDPC) cases. Increased expression was also observed in PCa cells after long-term androgen-deprivation treatment (ADT). In vitro data indic...Continue Reading


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