The tumor suppressor interferon regulatory factor 8 inhibits β-catenin signaling in breast cancers, but is frequently silenced by promoter methylation.

ABSTRACT: Interferon (IFN) regulatory factor 8 is encoded by a novel candidate tumor suppressor gene (IRF8), its promotor is frequently methylated in multiple cancers. However, the promoter methylation status, functions and underlying mechanisms of IRF8 in breast cancer remain unclear. We found that IRF8 was downregulated in breast cancer cell lines and primary tumors, compared with normal breast tissues, mainly because of aberrant promoter methylation. However, its expression was not associated with pathological characteristics. Restoration of IRF8 expression suppressed cell proliferation, colony formation, 5-ethynyl-2'-deoxyuridine incorporation, cell migration and invasion, and induced apoptosis and cell cycle arrest in vitro. IRF8 also inhibited xenograft growth in nude mice in vivo. Competition

SUBMITTER: Luo X 

PROVIDER: S-EPMC5564732 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature