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. 1991 May;84(2):297–302. doi: 10.1111/j.1365-2249.1991.tb08164.x

Clonal analysis of liver-infiltrating T cells in patients with LKM-1 antibody-positive autoimmune chronic active hepatitis.

H Löhr 1, M Manns 1, A Kyriatsoulis 1, A W Lohse 1, C Trautwein 1, K H Meyer zum Büschenfelde 1, B Fleischer 1
PMCID: PMC1535412  PMID: 2025956

Abstract

Autoantibodies against microsomal antigen of liver and kidney (LKM-1) are diagnostic markers for a subgroup of autoimmune chronic active hepatitis (AI-CAH). Cytochrome P450dbl, now classified as cytochrome P450 IID6, is the major antigen of LKM-1 antibodies. Immunohistological studies suggest that hepatic injury in AI-CAH is mediated by liver-infiltrating T cells. In the present study the specificity and function of liver-infiltrating T cells was analysed at the clonal level. Phenotypical characterization of 189 T cell clones isolated from four liver biopsies of LKM-1 antibody-positive patients showed an enrichment of CD4+ CD8- T cell clones proliferated specifically in the presence of recombinant human LKM-1 antigen (rLKM). This reaction was restricted to autologous antigen-presenting cells and to HLA class II molecules. In order to see whether rLKM was also recognized by peripheral blood T lymphocytes (PBL) we tested the proliferative response of PBL from several individuals. PBL from three of the four patients with LKM-1 antibody-positive AI-CAH proliferated to rLKM, whereas no response was seen with PBL from patients with LKM-1 antibody-negative chronic liver diseases and from healthy blood donors. These data demonstrate that the LKM-1 antigen is recognized by liver-infiltrating T cells in LKM-1 antibody-positive AI-CAH. For further functional characterization, liver-derived T cell clones were tested for their cytotoxic activity. In the presence of phytohaemagglutinin 24 out of 26 CD4- CD8+ but also 20 out of 63 CD4+ CD8- T cell clones lysed autologous as well as allogenic EBV-transformed B cell lines or K562 cells. Five CD4- CD8+ T cell clones lysed autologous but not allogenic B cell lines spontaneously in a HLA class I-restricted manner. Although the antigen specificity of these clones is still unknown the data show the presence of autoreactive T cells at the site of inflammation that could contribute in the pathogenesis of AI-CAH.

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Selected References

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