In situ nucleic acid hybridization of cytokines in primary biliary cirrhosis: Predominance of the Th1 subset

Kenichi Harada, Judith A Van de Water, Patrick S Leung, Ross L. Coppel, Aftab Ansari, Yasuni Nakanuma, M. Eric Gershwin

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Abstract

Primary biliary cirrhosis (PBC) is an autoimmune liver disease characterized by destruction of the intrahepatic bile ducts. It is generally believed that cellular immune mechanisms, particularly involving T cells, result in this bile duct damage. The relative strength of Th1 and Th2 responses has recently been proposed to be an important factor in the pathophysiology of various autoimmune diseases. In this study, we have attempted to identify the Th subset balance in PBC, by detection of cytokines specific to the two T-cell subsets, i.e., interferon γ (IFN-γ) for Th1 cells and interleukin-4 (IL-4) for Th2 cells. We analyzed IFN-γ and IL-4 messenger RNA (mRNA) positive cells in liver sections from 18 patients with PBC and 35 disease controls including chronic active hepatitis C, extrahepatic biliary obstruction (EBO), and normal liver, using nonisotopic in situ hybridization and immunohistochemistry. Mononuclear cells expressing IFN-γ and IL-4 mRNA were aggregated in inflamed portal tracts in PBC livers, but were rarely present in extrahepatic biliary obstruction, alcoholic fibrosis, or normal liver sections. The IFN-γ and IL-4 mRNA positive cells in PBC livers were detected in significantly higher numbers than in control livers (P <.01). Moreover, IFN-mRNA expression was more commonly detected than IL-4 expression in PBC livers, and the levels of IFN-γ mRNA expression were highly correlated with the degree of portal inflammatory activity. IFN- γ mRNA-positive cells were detected primarily around damaged bile ducts that were surrounded by lymphoid aggregates. The data indicate that Th1 cells are the more prominent T-cell subset in the lymphoid infiltrates in PBC.

Original languageEnglish (US)
Pages (from-to)791-796
Number of pages6
JournalHepatology
Volume25
Issue number4
DOIs
StatePublished - 1997

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ASJC Scopus subject areas

  • Hepatology

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