[1]The Affiliated DrumTower Hospital of Nanjing University Medical School, Department of General Surgery,Nanjing,China
[2]Fudan University Shanghai Medical College,Shanghai,China
[3]Renji Hospital, State Key Laboratory of Oncogenes and Related Genes,Shanghai,China
[4]Qidong Liver Cancer Institute,Qidong,China
[5]Capital Medical University China, Department of Orthopaedics,Beijing,China
Nuclear factor kappa B (NF-κB) is an important factor linking inflammation and tumorigenesis. In this study we experimentally demonstrated through a high-throughput luciferase reporter screen that NF-κB signaling can be directly targeted by nearly 29 microRNAs (miRNAs). Many of these miRNAs can directly target NF-κB signaling nodes by binding to their 3′ untranslated region (UTR). miR-195, a member of the miR-15 family, is frequently down-regulated in gastrointestinal cancers, especially in hepatocellular carcinoma (HCC). The expression level of miR-195 is inversely correlated with HCC tumor size. We further show that miR-195 suppresses cancer cell proliferation and migration in vitro and reduces tumorigenicity and metastasis in vivo. Additionally, miR-195 may exert its tumor suppressive function by decreasing the expression of multiple NF-κB downstream effectors by way of the direct targeting of IKKα and TAB3. Conclusion: Multiple miRNAs are involved in the NF-κB signaling pathway and miR-195 plays important inhibitory roles in cancer progression and may be a potential therapeutic target. © 2013 by the American Association for the Study of Liver Diseases.