title: Role of WNT7B-induced noncanonical pathway in advanced prostate cancer.
abstract: Advanced prostate cancer is characterized by incurable castration-resistant progression and osteoblastic bone metastasis. While androgen deprivation therapy remains the primary treatment for advanced prostate cancer, resistance inevitably develops. Importantly, mounting evidence indicates that androgen receptor (AR) signaling continues to play a critical role in the growth of advanced prostate cancer despite androgen deprivation. While the mechanisms of aberrant AR activation in advanced prostate cancer have been extensively studied, the downstream AR target genes involved in the progression of castration resistance are largely unknown. Here, we identify WNT7B as a direct AR target gene highly expressed in castration-resistant prostate cancer (CRPC) cells. Our results show that expression of WNT7B is necessary for the growth of prostate cancer cells and that this effect is enhanced under androgen-deprived conditions. Further analyses reveal that WNT7B promotes androgen-independent growth of CRPC cells likely through the activation of protein kinase C isozymes. Our results also show that prostate cancer-produced WNT7B induces osteoblast differentiation in vitro through a direct cell-cell interaction, and that WNT7B is upregulated in human prostate cancer xenografts that cause an osteoblastic reaction when grown in bone. Taken together, these results suggest that AR-regulated WNT7B signaling is critical for the growth of CRPC and development of the osteoblastic bone response characteristic of advanced prostate cancer.
authors: Center for Pharmacogenomics, Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA.
authors: Dali
authors: D
authors: Zheng
authors: Keith F
authors: KF
authors: Decker
authors: Tianhua
authors: T
authors: Zhou
authors: Jianquan
authors: J
authors: Chen
authors: Zongtai
authors: Z
authors: Qi
authors: Kathryn
authors: K
authors: Jacobs
authors: Katherine N
authors: KN
authors: Weilbaecher
authors: Eva
authors: E
authors: Corey
authors: Fanxin
authors: F
authors: Long
authors: Li
authors: L
authors: Jia
mesh_terms: D000728:Androgens / Q000172:deficiency / Q000378:metabolism; D000818:Animals; D001859:Bone Neoplasms / Q000378:metabolism / Q000556:secondary; D048708:Cell Growth Processes / Q000502:physiology; D045744:Cell Line, Tumor; D015972:Gene Expression Regulation, Neoplastic; D055785:Gene Knockdown Techniques; D045325:HCT116 Cells; D006801:Humans; D008297:Male; D051379:Mice; D009376:Neoplasms, Hormone-Dependent / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D064129:Prostatic Neoplasms, Castration-Resistant / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D011944:Receptors, Androgen / Q000378:metabolism; D015398:Signal Transduction; D014162:Transfection; D051153:Wnt Proteins / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*
chemical_list: D000728:Androgens; D011944:Receptors, Androgen; C490675:WNT7B protein, human; D051153:Wnt Proteins
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