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 in | Journal of Virology Vol. 79; no. 4; pp. 2230 - 2239 |
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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 |
AuthorAffiliation_xml | – name: Microbiology and Tumor Biology Centre, Karolinska Institutet, Stockholm, 1 Department of Medical Biochemistry and Microbiology, Biomedical Centre, Uppsala University, Uppsala, Sweden 2 |
Author_xml | – sequence: 1 givenname: Sara surname: SUNDSTRÖM fullname: SUNDSTRÖM, Sara organization: Microbiology and Tumor Biology Centre, Karolinska Institutet, Stockholm, Sweden – sequence: 2 givenname: Seisuke surname: OTA fullname: OTA, Seisuke organization: Microbiology and Tumor Biology Centre, Karolinska Institutet, Stockholm, Sweden – sequence: 3 givenname: Lina Y surname: DIMBERG fullname: DIMBERG, Lina Y organization: Department of Medical Biochemistry and Microbiology, Biomedical Centre, Uppsala University, Uppsala, Sweden – sequence: 4 givenname: Maria G surname: MASUCCI fullname: MASUCCI, Maria G organization: Microbiology and Tumor Biology Centre, Karolinska Institutet, Stockholm, Sweden – sequence: 5 givenname: Anders surname: BERGQVIST fullname: BERGQVIST, Anders organization: Microbiology and Tumor Biology Centre, Karolinska Institutet, Stockholm, Sweden |
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Keywords | Virus Interleukin 2 Microbiology Enzyme Cytokine Mitogen-activated protein kinase Flaviviridae Hepatitis C virus Hepacivirus Protein Virology |
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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 |
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