Hepatitis C Virus Core Protein Induces an Anergic State Characterized by Decreased Interleukin-2 Production and Perturbation of Mitogen-Activated Protein Kinase Responses

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Published inJournal of Virology Vol. 79; no. 4; pp. 2230 - 2239
Main Authors SUNDSTRÖM, Sara, OTA, Seisuke, DIMBERG, Lina Y, MASUCCI, Maria G, BERGQVIST, Anders
Format Journal Article
LanguageEnglish
Published Washington, DC American Society for Microbiology 15.02.2005
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Alterations of cytokine responses are thought to favor the establishment of persistent hepatitis C virus (HCV) infections, enhancing the risk of liver cirrhosis and hepatocellular carcinoma. Here we demonstrate that the expression of the HCV core (C) protein in stably transfected T cells correlates with a selective reduction of interleukin-2 (IL-2) promoter activity and IL-2 production in response to T-cell receptor triggering, whereas the activation of IL-4, IL-10, gamma interferon, and tumor necrosis factor alpha was moderately increased. This altered cytokine expression profile was associated with a perturbation of mitogen-activated protein (MAP) kinase responses. Extracellular regulated kinase and p38 were constitutively phosphorylated in C-expressing cells, while triggering of the costimulatory c-Jun N-terminal kinase (JNK) signaling cascade and activation of the CD28 response element within the IL-2 promoter appeared to be impaired. The perturbations of MAP kinase phosphorylation could be eliminated by cyclosporine A-mediated inhibition of nuclear factor of activated T cells, suggesting that the inactivation of JNK signaling and hyporesponsiveness to IL-2 induction were downstream consequences of C-induced Ca 2+ flux in a manner that mimics the induction of clonal anergy.
ABSTRACT Alterations of cytokine responses are thought to favor the establishment of persistent hepatitis C virus (HCV) infections, enhancing the risk of liver cirrhosis and hepatocellular carcinoma. Here we demonstrate that the expression of the HCV core (C) protein in stably transfected T cells correlates with a selective reduction of interleukin-2 (IL-2) promoter activity and IL-2 production in response to T-cell receptor triggering, whereas the activation of IL-4, IL-10, gamma interferon, and tumor necrosis factor alpha was moderately increased. This altered cytokine expression profile was associated with a perturbation of mitogen-activated protein (MAP) kinase responses. Extracellular regulated kinase and p38 were constitutively phosphorylated in C-expressing cells, while triggering of the costimulatory c-Jun N-terminal kinase (JNK) signaling cascade and activation of the CD28 response element within the IL-2 promoter appeared to be impaired. The perturbations of MAP kinase phosphorylation could be eliminated by cyclosporine A-mediated inhibition of nuclear factor of activated T cells, suggesting that the inactivation of JNK signaling and hyporesponsiveness to IL-2 induction were downstream consequences of C-induced Ca 2+ flux in a manner that mimics the induction of clonal anergy.
Alterations of cytokine responses are thought to favor the establishment of persistent hepatitis C virus (HCV) infections, enhancing the risk of liver cirrhosis and hepatocellular carcinoma. Here we demonstrate that the expression of the HCV core (C) protein in stably transfected T cells correlates with a selective reduction of interleukin-2 (IL-2) promoter activity and IL-2 production in response to T-cell receptor triggering, whereas the activation of IL-4, IL-10, gamma interferon, and tumor necrosis factor alpha was moderately increased. This altered cytokine expression profile was associated with a perturbation of mitogen-activated protein (MAP) kinase responses. Extracellular regulated kinase and p38 were constitutively phosphorylated in C-expressing cells, while triggering of the costimulatory c-Jun N-terminal kinase (JNK) signaling cascade and activation of the CD28 response element within the IL-2 promoter appeared to be impaired. The perturbations of MAP kinase phosphorylation could be eliminated by cyclosporine A-mediated inhibition of nuclear factor of activated T cells, suggesting that the inactivation of JNK signaling and hyporesponsiveness to IL-2 induction were downstream consequences of C-induced Ca2+ flux in a manner that mimics the induction of clonal anergy.
Alterations of cytokine responses are thought to favor the establishment of persistent hepatitis C virus (HCV) infections, enhancing the risk of liver cirrhosis and hepatocellular carcinoma. Here we demonstrate that the expression of the HCV core (C) protein in stably transfected T cells correlates with a selective reduction of interleukin-2 (IL-2) promoter activity and IL-2 production in response to T-cell receptor triggering, whereas the activation of IL-4, IL-10, gamma interferon, and tumor necrosis factor alpha was moderately increased. This altered cytokine expression profile was associated with a perturbation of mitogen-activated protein (MAP) kinase responses. Extracellular regulated kinase and p38 were constitutively phosphorylated in C-expressing cells, while triggering of the costimulatory c-Jun N-terminal kinase (JNK) signaling cascade and activation of the CD28 response element within the IL-2 promoter appeared to be impaired. The perturbations of MAP kinase phosphorylation could be eliminated by cyclosporine A-mediated inhibition of nuclear factor of activated T cells, suggesting that the inactivation of JNK signaling and hyporesponsiveness to IL-2 induction were downstream consequences of C-induced Ca super(2+) flux in a manner that mimics the induction of clonal anergy.
Alterations of cytokine responses are thought to favor the establishment of persistent hepatitis C virus (HCV) infections, enhancing the risk of liver cirrhosis and hepatocellular carcinoma. Here we demonstrate that the expression of the HCV core (C) protein in stably transfected T cells correlates with a selective reduction of interleukin-2 (IL-2) promoter activity and IL-2 production in response to T-cell receptor triggering, whereas the activation of IL-4, IL-10, gamma interferon, and tumor necrosis factor alpha was moderately increased. This altered cytokine expression profile was associated with a perturbation of mitogen-activated protein (MAP) kinase responses. Extracellular regulated kinase and p38 were constitutively phosphorylated in C-expressing cells, while triggering of the costimulatory c-Jun N-terminal kinase (JNK) signaling cascade and activation of the CD28 response element within the IL-2 promoter appeared to be impaired. The perturbations of MAP kinase phosphorylation could be eliminated by cyclosporine A-mediated inhibition of nuclear factor of activated T cells, suggesting that the inactivation of JNK signaling and hyporesponsiveness to IL-2 induction were downstream consequences of C-induced Ca(2+) flux in a manner that mimics the induction of clonal anergy.
Author Seisuke Ota
Anders Bergqvist
Sara Sundström
Maria G. Masucci
Lina Y. Dimberg
AuthorAffiliation Microbiology and Tumor Biology Centre, Karolinska Institutet, Stockholm, 1 Department of Medical Biochemistry and Microbiology, Biomedical Centre, Uppsala University, Uppsala, Sweden 2
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Issue 4
Keywords Virus
Interleukin 2
Microbiology
Enzyme
Cytokine
Mitogen-activated protein kinase
Flaviviridae
Hepatitis C virus
Hepacivirus
Protein
Virology
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Corresponding author. Mailing address: MTC, Karolinska Institutet, Box 280, SE-171 77 Stockholm, Sweden. Phone: 46-8-52487149. Fax: 46-8-331399. E-mail: anders.bergqvist@mtc.ki.se.
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Snippet Article Usage Stats Services JVI Citing Articles Google Scholar PubMed Related Content Social Bookmarking CiteULike Delicious Digg Facebook Google+ Mendeley...
Alterations of cytokine responses are thought to favor the establishment of persistent hepatitis C virus (HCV) infections, enhancing the risk of liver...
ABSTRACT Alterations of cytokine responses are thought to favor the establishment of persistent hepatitis C virus (HCV) infections, enhancing the risk of liver...
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StartPage 2230
SubjectTerms Biological and medical sciences
Calcium-Calmodulin-Dependent Protein Kinases - metabolism
Clinical virology
Clonal Anergy
Enzyme Activation
Fundamental and applied biological sciences. Psychology
Hepacivirus
Hepatitis C virus
Humans
Interleukin-2 - biosynthesis
Jurkat Cells
Klinisk virologi
Medical Virology
MEDICIN
Medicin och hälsovetenskap
MEDICINE
medicinsk virologi
Microbiology
Microbiology, immunology, infectious diseases
Mikrobiologi
Mikrobiologi, immunologi, infektionssjukdomar
Miscellaneous
Mitogen-Activated Protein Kinase Kinases - metabolism
Mitogen-Activated Protein Kinases - metabolism
Pathogenesis and Immunity
T-Lymphocytes - drug effects
T-Lymphocytes - pathology
T-Lymphocytes - virology
Tumor Cells, Cultured
Viral Core Proteins - pharmacology
Virologi
Virology
Title Hepatitis C Virus Core Protein Induces an Anergic State Characterized by Decreased Interleukin-2 Production and Perturbation of Mitogen-Activated Protein Kinase Responses
URI http://jvi.asm.org/content/79/4/2230.abstract
https://www.ncbi.nlm.nih.gov/pubmed/15681425
https://search.proquest.com/docview/17864037
https://pubmed.ncbi.nlm.nih.gov/PMC546561
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-86667
http://kipublications.ki.se/Default.aspx?queryparsed=id:1948385
Volume 79
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