Expression of the chemokine IP-10 correlates with the accumulation of hepatic IFN-γ and IL-18 mRNA in chronic hepatitis C but not in hepatitis B
Article first published online: 2 JUN 2003
Copyright © 2003 Wiley-Liss, Inc.
Journal of Medical Virology
Volume 70, Issue 4, pages 562–570, August 2003
How to Cite
Mihm, S., Schweyer, S. and Ramadori, G. (2003), Expression of the chemokine IP-10 correlates with the accumulation of hepatic IFN-γ and IL-18 mRNA in chronic hepatitis C but not in hepatitis B. J. Med. Virol., 70: 562–570. doi: 10.1002/jmv.10431
- Issue published online: 2 JUN 2003
- Article first published online: 2 JUN 2003
- Manuscript Accepted: 2 DEC 2002
- hepatitis C virus (HCV);
- hepatitis B virus (HBV);
- interferon gamma (IFN-γ);
- interferon gamma inducible protein 10 (IP-10, CXCL10);
- interleukin-18 (IL-18)
The pathogenesis of hepatitis C virus-induced chronic liver disease is still poorly understood. Previous studies revealed enhanced hepatic expression of the Th1 prototype cytokine IFN-γ in individuals with chronic hepatitis C. In accordance with several animal models of experimentally induced hepatitis, a Th1 lymphocyte driven inflammatory process, which involves newly infiltrated as well as resident monocytes/macrophages, has been proposed. An involvement of the interferon-γ-inducible chemokine IP-10, which is chemoattractive for stimulated Th1 cells and monocytes, is also suggested. Using an HBV transgenic mouse model, a reduction of hepatic infiltration and liver disease was achieved recently by administration of antibodies directed against the interferon-γ-inducible chemokine Mig and against IP-10. In the present study, expression of IP-10 was investigated both in serum and in the liver of patients with chronic hepatitis C and hepatitis B. Patients with liver diseases of non-viral etiologies served as controls. IP-10 expression was highest in hepatitis C. In chronic hepatitis C, but not in chronic hepatitis B nor in liver disorders unrelated to viral infections, IP-10 expression was strongly correlated with the amount of transcripts for IFN-γ and to the amount of transcripts for the constitutively expressed macrophage derived cytokine IL-18. Hepatic inflammatory activity, however, was found to be associated more closely with IFN-γ than with IP-10 or IL-18 mRNA expression. The data support the hypothesis that IP-10 is responsible for the recruitment of Th cells and monocytes in chronic hepatitis C, and suggest that its role in chronic hepatitis B is less determining. Moreover, they deliver additional support for the view that IFN-γ still has to be considered as a mediator that determines the outcome of inflammation, e.g., via its ability to activate IL-18 expressing cells and to initiate a delayed type hypersensitivity reaction. J. Med. Virol. 70:562–570, 2003. © 2003 Wiley-Liss, Inc.