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Gut. 2000 Feb;46(2):255-9.

Liver infiltrating T lymphocytes express interferon gamma and inducible nitric oxide synthase in chronic hepatitis C virus infection.

Author information

  • 1Department of Pathology, Division of Pathology, Georg-August University, Göttingen, Germany.

Abstract

BACKGROUND:

Pathogenesis of hepatitis C virus (HCV) associated liver injury is thought to be due to the host antiviral immune response. Using a quantitative, competitive RT-PCR technique, we recently showed that expression of interferon gamma (IFN-gamma) and IFN-gamma inducible type of nitric oxide synthase (iNOS) is increased in homogenised liver tissue of patients with chronic HCV infection.

AIMS:

To determine the cellular origin of IFN-gamma and iNOS expression and to examine the hypothesis that T cell derived IFN-gamma secretion induces iNOS in hepatocytes in chronic HCV infection.

METHODS:

By applying a non-radioactive in situ hybridisation method combined with indirect immunofluorescence, 33 liver biopsy specimens from patients with chronic HCV infection were studied for cellular expression of IFN-gamma and iNOS mRNA.

RESULTS:

In chronic HCV infection, both IFN-gamma and iNOS gene expression were significantly increased. IFN-gamma and iNOS mRNA were observed in CD3+ lymphocytes infiltrating portal tracts and hepatic lobules, but not in hepatocytes.

CONCLUSIONS:

Results are consistent with previous reports that IFN-gamma and iNOS transcripts are elevated in chronic HCV infection. In contrast to the hypothesis, IFN-gamma expressing T cells do not induce iNOS in hepatocytes, but probably in T cells. T lymphocytes expressing IFN-gamma and/or iNOS have the potential to participate in autocrine and paracrine pathways that may contribute to the pathobiology of chronic hepatitis C.

PMID:
10644322
PMCID:
PMC1727815
[PubMed - indexed for MEDLINE]
Free PMC Article
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