Dadun Dadun cabecera universidad cabecera biblioteca
   (New user)
Help  | Contact  |  Castellano English  
 

Dadun > Depósito Académico > CIMA (Centro de Investigación Médica Aplicada) > Área de Terapia génica y Hepatología > Inmunología clínica > DA - CIMA - Terapia génica y Hepatología - Inmunología clínica - Artículos de revista >

The protein kinase IKKepsilon can inhibit HCV expression independently of IFN and its own expression is downregulated in HCV-infected livers
Authors: Velasco, M. (Myriam)
Larrea, E. (Esther)
Vitour, D. (Damien)
Dabo, S. (Stephanie)
Breiman, A. (Adrien)
Regnault, B. (Béatrice)
Riezu-Boj, J.I. (José Ignacio)
Eid, P. (Pierre)
Prieto, J. (Jesús)
Meurs, E.F. (Eliane F.)
Keywords: Hepacivirus/drug effects
Hepatitis C, Chronic/physiopathology
I-kappa B Kinase/biosynthesis
I-kappa B Kinase/physiology
Interferons/biosynthesis
Issue Date: 2006
Publisher: Wiley-Blackwell
Publisher version: bit.ly/SmLGiL
ISSN: 1527-3350
Citation: Vilasco M, Larrea E, Vitour D, Dabo S, Breiman A, Regnault B, et al. The protein kinase IKKepsilon can inhibit HCV expression independently of IFN and its own expression is downregulated in HCV-infected livers. Hepatology 2006 Dec;44(6):1635-1647.
Abstract
During a viral infection, binding of viral double-stranded RNAs (dsRNAs) to the cytosolic RNA helicase RIG-1 leads to recruitment of the mitochondria-associated Cardif protein, involved in activation of the IRF3-phosphorylating IKKepsilon/TBK1 kinases, interferon (IFN) induction, and development of the innate immune response. The hepatitis C virus (HCV) NS3/4A protease cleaves Cardif and abrogates both IKKepsilon/TBK1 activation and IFN induction. By using an HCV replicon model, we previously showed that ectopic overexpression of IKKepsilon can inhibit HCV expression. Here, analysis of the IKKepsilon transcriptome profile in these HCV replicon cells showed induction of several genes associated with the antiviral action of IFN. Interestingly, IKKepsilon still inhibits HCV expression in the presence of neutralizing antibodies to IFN receptors or in the presence of a dominant negative STAT1alpha mutant. This suggests that good IKKepsilon expression levels are important for rapid activation of the cellular antiviral response in HCV-infected cells, in addition to provoking IFN induction. To determine the physiological importance of IKKepsilon in HCV infection, we then analyzed its expression levels in liver biopsy specimens from HCV-infected patients. This analysis also included genes of the IFN induction pathway (RIG-I, MDA5, LGP2, Cardif, TBK1), and three IKKepsilon-induced genes (IFN-beta, CCL3, and ISG15). The results show significant inhibition of expression of IKKepsilon and of the RNA helicases RIG-I/MDA5/LGP2 in the HCV-infected patients, whereas expression of TBK1 and Cardif was not significantly altered. In conclusion, given the antiviral potential of IKKepsilon and of the RNA helicases, these in vivo data strongly support an important role for these genes in the control of HCV infection.
Permanent link: http://hdl.handle.net/10171/23322
Appears in Collections:DA - CIMA - Terapia génica y Hepatología - Inmunología clínica - Artículos de revista

Files in This Item:
File:  Hepatology2006_44_6.pdf
Description: 
Size:  704,16 kB
Format:  Adobe PDF
 View / Open 

Items in Dadun are protected by copyright, with all rights reserved, unless otherwise indicated.