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Li, Qiuhui; Liu, Bigang; Chao, Hsueh-Ping; Ji, Yibing; Lu, Yue; Mehmood, Rashid; Jeter, Collene; Chen, Taiping; Moore, John R; Li, Wenqian; Liu, Can; Rycaj, Kiera; Tracz, Amanda; Kirk, Jason; Calhoun-Davis, Tammy; Xiong, Jie; Deng, Qu; Huang, Jiaoti; Foster, Barbara A; Gokhale, Abhiram; Chen, Xin; Tang, Dean G
Nature communications, 12/2019, Volume: 10, Issue: 1Journal Article
LRIG1 has been reported to be a tumor suppressor in gastrointestinal tract and epidermis. However, little is known about the expression, regulation and biological functions of LRIG1 in prostate cancer (PCa). We find that LRIG1 is overexpressed in PCa, but its expression correlates with better patient survival. Functional studies reveal strong tumor-suppressive functions of LRIG1 in both AR and AR xenograft models, and transgenic expression of LRIG1 inhibits tumor development in Hi-Myc and TRAMP models. LRIG1 also inhibits castration-resistant PCa and exhibits therapeutic efficacy in pre-established tumors. We further show that 1) AR directly transactivates LRIG1 through binding to several AR-binding sites in LRIG1 locus, and 2) LRIG1 dampens ERBB expression in a cell type-dependent manner and inhibits ERBB2-driven tumor growth. Collectively, our study indicates that LRIG1 represents a pleiotropic AR-regulated feedback tumor suppressor that functions to restrict oncogenic signaling from AR, Myc, ERBBs, and, likely, other oncogenic drivers.
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