MiR-126 promotes coxsackievirus replication by mediating cross-talk of ERK1/2 and Wnt/β-catenin signal pathways.

TitleMiR-126 promotes coxsackievirus replication by mediating cross-talk of ERK1/2 and Wnt/β-catenin signal pathways.
Publication TypeJournal Article
Year of Publication2013
AuthorsYe, X, Hemida, MGomaa, Qiu, Y, Hanson, PJ, Zhang, HMary, Yang, D
JournalCell Mol Life Sci
Date Published2013 Dec
Keywords3' Untranslated Regions, Base Sequence, beta Catenin, Blotting, Western, Cell Line, Cells, Cultured, Enterovirus B, Human, Glycogen Synthase Kinase 3, HeLa Cells, Humans, Intracellular Signaling Peptides and Proteins, Low Density Lipoprotein Receptor-Related Protein-6, MAP Kinase Signaling System, Membrane Proteins, MicroRNAs, Phosphorylation, Proto-Oncogene Protein c-ets-1, Proto-Oncogene Protein c-ets-2, Reverse Transcriptase Polymerase Chain Reaction, rho GTP-Binding Proteins, RNA Interference, Sequence Homology, Nucleic Acid, Virus Replication, Wnt Signaling Pathway

Coxsackievirus B3 (CVB3) is one of the most prevalent causes of viral myocarditis and is associated with many other pathological conditions. CVB3 replication relies on host cellular machineries and causes direct damage to host cells. MicroRNAs have been found to regulate viral infections but their roles in CVB3 infection are still poorly understood. Here we describe a novel mechanism by which miR-126 regulates two signal pathways essential for CVB3 replication. We found that CVB3-induced ERK1/2 activation triggered the phosphorylation of ETS-1 and ETS-2 transcription factors, which induced miR-126 upregulation. By using both microRNA mimics and inhibitors, we proved that the upregulated miR-126 suppressed sprouty-related, EVH1 domain containing 1 (SPRED1) and in turn enhanced ERK1/2 activation. This positive feedback loop of ERK1/2-miR-126-ERK1/2 promoted CVB3 replication. Meanwhile, miR-126 expression stimulated GSK-3β activity and induced degradation of β-catenin through suppressing LRP6 and WRCH1, two newly identified targets in the Wnt/β-catenin pathway, which sensitized the cells to virus-induced cell death and increased viral progeny release to initiate new infections. Our results demonstrate that upregulated miR-126 upon CVB3 infection targets SPRED1, LRP6, and WRCH1 genes, mediating cross-talk between ERK1/2 and Wnt/β-catenin pathways, and thus promoting viral replication and contributes to the viral cytopathogenicity.

Alternate JournalCell. Mol. Life Sci.
PubMed ID23811937
Grant ListMOP231119 / / Canadian Institutes of Health Research / Canada