| Literature DB >> 25982816 |
Pierrick G J Fournier1, Patricia Juárez1, Guanglong Jiang2, Gregory A Clines3, Maria Niewolna1, Hun Soo Kim4, Holly W Walton5, Xiang Hong Peng1, Yunlong Liu2, Khalid S Mohammad1, Clark D Wells6, John M Chirgwin7, Theresa A Guise8.
Abstract
Transforming growth factor-β (TGF-β) regulates the expression of genes supporting breast cancer cells in bone, but little is known about prostate cancer bone metastases and TGF-β. Our study reveals that the TGFBR1 inhibitor SD208 effectively reduces prostate cancer bone metastases. TGF-β upregulates in prostate cancer cells a set of genes associated with cancer aggressiveness and bone metastases, and the most upregulated gene was PMEPA1. In patients, PMEPA1 expression decreased in metastatic prostate cancer and low Pmepa1 correlated with decreased metastasis-free survival. Only membrane-anchored isoforms of PMEPA1 interacted with R-SMADs and ubiquitin ligases, blocking TGF-β signaling independently of the proteasome. Interrupting this negative feedback loop by PMEPA1 knockdown increased prometastatic gene expression and bone metastases in a mouse prostate cancer model.Entities:
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Year: 2015 PMID: 25982816 PMCID: PMC4464909 DOI: 10.1016/j.ccell.2015.04.009
Source DB: PubMed Journal: Cancer Cell ISSN: 1535-6108 Impact factor: 31.743