β-Catenin Upregulates the Constitutive and Virus-Induced Transcriptional Capacity of the Interferon Beta Promoter through T-Cell Factor Binding Sites

• Published in: Molecular and cellular biology Vol. 36; no. 1; pp. 13 - 29
• Main Authors: Marcato, Vasco, Luron, Lionel, Laqueuvre, Lucie M., Simon, Dominique, Mansuroglu, Zeyni, Flamand, Marie, Panthier, Jean-Jacques, Souès, Sylvie, Massaad, Charbel, Bonnefoy, Eliette
• Format: Journal Article
• Language: English
• Published: United States Taylor & Francis 01.01.2016; American Society for Microbiology
• Subjects: Animals; beta Catenin; beta Catenin - metabolism; Binding Sites; Glycogen Synthase Kinase 3; Glycogen Synthase Kinase 3 - metabolism; Interferon-beta; Interferon-beta - genetics; Interferon-beta - metabolism; Life Sciences; Mice; Microbiology and Parasitology; Promoter Regions, Genetic; Rift Valley fever virus; Signal Transduction; Signal Transduction - genetics; Signal Transduction - physiology; T-Lymphocytes; T-Lymphocytes - metabolism; TCF Transcription Factors; TCF Transcription Factors - genetics; Transcriptional Activation; Transcriptional Activation - genetics; Transcriptional Activation - physiology; Up-Regulation; Virology
• ISSN: 1098-5549; 0270-7306; 1098-5549
• DOI: 10.1128/MCB.00641-15

Rapid upregulation of interferon beta (IFN-β) expression following virus infection is essential to set up an efficient innate antiviral response. Biological roles related to the antiviral and immune response have also been associated with the constitutive production of IFN-β in naive cells. However, the mechanisms capable of modulating constitutive IFN-β expression in the absence of infection remain largely unknown. In this work, we demonstrate that inhibition of the kinase glycogen synthase kinase 3 (GSK-3) leads to the upregulation of the constitutive level of IFN-β expression in noninfected cells, provided that GSK-3 inhibition is correlated with the binding of β-catenin to the IFN-β promoter. Under these conditions, IFN-β expression occurred through the T-cell factor (TCF) binding sites present on the IFN-β promoter independently of interferon regulatory factor 3 (IRF3). Enhancement of the constitutive level of IFN-β per se was able to confer an efficient antiviral state to naive cells and acted in synergy with virus infection to stimulate virus-induced IFN-β expression. Further emphasizing the role of β-catenin in the innate antiviral response, we show here that highly pathogenic Rift Valley fever virus (RVFV) targets the Wnt/β-catenin pathway and the formation of active TCF/β-catenin complexes at the transcriptional and protein level in RVFV-infected cells and mice.