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JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
Histone Deacetylase Inhibitors Enhance the Therapeutic Potential of Reovirus in Multiple Myeloma.
Molecular Cancer Therapeutics 2016 May
Multiple myeloma remains incurable and the majority of patients die within 5 years of diagnosis. Reolysin, the infusible form of human reovirus (RV), is a novel viral oncolytic therapy associated with antitumor activity likely resulting from direct oncolysis and a virus-mediated antitumor immune response. Results from our phase I clinical trial investigating single agent Reolysin in patients with relapsed multiple myeloma confirmed tolerability, but no objective responses were evident, likely because the virus selectively entered the multiple myeloma cells but did not actively replicate. To date, the precise mechanisms underlying the RV infectious life cycle and its ability to induce oncolysis in patients with multiple myeloma remain unknown. Here, we report that junctional adhesion molecule 1 (JAM-1), the cellular receptor for RV, is epigenetically regulated in multiple myeloma cells. Treatment of multiple myeloma cells with clinically relevant histone deacetylase inhibitors (HDACi) results in increased JAM-1 expression as well as increased histone acetylation and RNA polymerase II recruitment to its promoter. Furthermore, our data indicate that the combination of Reolysin with HDACi, potentiates RV killing activity of multiple myeloma cells in vitro and in vivo This study provides the molecular basis to use these agents as therapeutic tools to increase the efficacy of RV therapy in multiple myeloma. Mol Cancer Ther; 15(5); 830-41. ©2016 AACR.
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