JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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DAB2IP regulates EMT and metastasis of prostate cancer through targeting PROX1 transcription and destabilizing HIF1α protein.

Cellular Signalling 2016 November
Prospero-related homeobox 1 (PROX1) is an essential regulator in lymphangiogenesis and has been implicated in both oncogenic and tumor-suppressive functions in many types of human cancers. However, the role of PROX1 in prostate cancer (PCa) remains poorly understood. In this study, based on different PCa cell lines and knockout mice, we showed that PROX1 could be suppressed by DAB2IP, a novel member of the Ras GTPase-activating protein family and a critical player in control of epithelial-mesenchymal transition (EMT) and PCa metastasis. Mechanistically, PROX1 overexpression in DAB2IP-deficient PCa cells could enhance the accumulation of HIF1α protein by inhibiting ubiquitin pathway and then consequently induce an EMT response, which is characterized by repression of E-cadherin, up-regulation of vimentin and matrix metallopeptidases (MMPs) and enhancement of cell migration. Together, our data provides a new insight into mechanism that DAB2IP regulates EMT and PCa metastasis, especially points out the potential roles of its downstream PROX1/HIF1α signaling in a unique non-skeletal metastasis of PCa.

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