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Int. J. Mol. Sci. 2017, 18(3), 529;

RNase L Suppresses Androgen Receptor Signaling, Cell Migration and Matrix Metalloproteinase Activity in Prostate Cancer Cells

Department of Biological Sciences, 2801 W. Bancroft St., University of Toledo, Toledo, OH 43606, USA
Author to whom correspondence should be addressed.
Academic Editor: Carsten Stephan
Received: 22 January 2017 / Revised: 15 February 2017 / Accepted: 20 February 2017 / Published: 1 March 2017
(This article belongs to the Special Issue Diagnostic, Prognostic and Predictive Biomarkers in Prostate Cancer)
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The interferon antiviral pathways and prostate cancer genetics converge on a regulated endoribonuclease, RNase L. Positional cloning and linkage studies mapped Hereditary Prostate Cancer 1 (HPC1) to RNASEL. To date, there is no correlation of viral infections with prostate cancer, suggesting that RNase L may play additional roles in tumor suppression. Here, we demonstrate a role of RNase L as a suppressor of androgen receptor (AR) signaling, cell migration and matrix metalloproteinase activity. Using RNase L mutants, we show that its nucleolytic activity is dispensable for both AR signaling and migration. The most prevalent HPC1-associated mutations in RNase L, R462Q and E265X, enhance AR signaling and cell migration. RNase L negatively regulates cell migration and attachment on various extracellular matrices. We demonstrate that RNase L knockdown cells promote increased cell surface expression of integrin β1 which activates Focal Adhesion Kinase-Sarcoma (FAK-Src) pathway and Ras-related C3 botulinum toxin substrate 1-guanosine triphosphatase (Rac1-GTPase) activity to increase cell migration. Activity of matrix metalloproteinase (MMP)-2 and -9 is significantly increased in cells where RNase L levels are ablated. We show that mutations in RNase L found in HPC patients may promote prostate cancer by increasing expression of AR-responsive genes and cell motility and identify novel roles of RNase L as a prostate cancer susceptibility gene. View Full-Text
Keywords: RNase L; androgen receptor; filamin A; prostate cancer RNase L; androgen receptor; filamin A; prostate cancer

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Dayal, S.; Zhou, J.; Manivannan, P.; Siddiqui, M.A.; Ahmad, O.F.; Clark, M.; Awadia, S.; Garcia-Mata, R.; Shemshedini, L.; Malathi, K. RNase L Suppresses Androgen Receptor Signaling, Cell Migration and Matrix Metalloproteinase Activity in Prostate Cancer Cells. Int. J. Mol. Sci. 2017, 18, 529.

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