Sulforaphane suppresses PRMT5/MEP50 function in epidermal squamous cell carcinoma leading to reduced tumor formation
PublisherOxford University Press
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AbstractProtein arginine methyltransferase 5 (PRMT5) cooperates with methylosome protein 50 (MEP50) to arginine methylate histone H3 and H4 to silence gene expression, and increased PRMT5 activity is associated with enhanced cancer cell survival. We have studied the role of PRMT5 and MEP50 in epidermal squamous cell carcinoma. We show that knockdown of PRMT5 or MEP50 results in reduced H4R3me2s formation, and reduced cell proliferation, invasion, migration and tumor formation. We further show that treatment with sulforaphane (SFN), a cancer preventive agent derived from cruciferous vegetables, reduces PRMT5 and MEP50 level and H4R3me2s formation, and this is associated with reduced cell proliferation, invasion and migration. The SFN-dependent reduction in PRMT5 and MEP50 level requires proteasome activity. Moreover, SFN-mediated responses are partially reversed by forced PRMT5 or MEP50 expression. SFN treatment of tumors results in reduced MEP50 level and H4R3me2s formation, confirming that that SFN impacts this complex in vivo. These studies suggest that the PRMT5/MEP50 is required for tumor growth and that reduced expression of this complex is a part of the mechanism of SFN suppression of tumor formation. Copyright The Author 2017. Published by Oxford University Press.
SponsorsThis work was supported by grants from the Maryland Stem Cell Research Foundation (R.L.E.) and the National Institutes of Health (CA131074 and CA184027 to R.L.E.) and a pilot grant from the Greenebaum Cancer Center (P30 CA134274). Conflict of Interest Statement: None declared.
Keywordmethylosome protein 50
Adaptor Proteins, Signal Transducing--genetics
Carcinoma, Squamous Cell--drug therapy
Isothiocyanates--administration & dosage
Identifier to cite or link to this itemhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85028435554&doi=10.1093%2fcarcin%2fbgx044&partnerID=40&md5=dcfd00dfb95b54eb9bc7ecbe535b3620; http://hdl.handle.net/10713/11326