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Takahashi I, Iijima H, Katashima R, Itakura M, Kiyono H. Clonal Expansion of CD4+ TCRββ+ T Cells in TCR α-Chain- Deficient Mice by Gut-Derived Antigens. THE JOURNAL OF IMMUNOLOGY 1999. [DOI: 10.4049/jimmunol.162.3.1843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
A population of CD4+ α−β+ T cells increases in the mucosal and peripheral lymphoid tissues of TCRα-chain-deficient mice with inflammatory bowel disease. The α−β+ T cells, which produce predominantly IL-4, mediate the proliferation of colonic epithelial crypts and the infiltration of large numbers of IgA-producing plasma cells into the lamina propria of the colon. To examine whether enteric Ags were recognized by a population of monoclonal α−β+ T cells leading to the intestinal inflammation, we examined the usage and clonotypes of TCR expressed by the α−β+ T cells in TCRα-chain-deficient mice with inflammatory bowel disease. Analyses of immunoprecipitates by two dimensional electrophoresis and single-cell RT-PCR revealed that TCR of the α−β+ T cells was a homodimer of β-chains that was capable of recognizing luminal bacterial Ags. PCR single-strand conformation polymorphism analysis of TCR Vβ transcripts revealed monoclonal accumulation of the α−β+ T cells in the colonic lamina propria of the diseased mice. DNA sequencing revealed the accumulation of the α−β+ T cells with the same CDR3 sequences in the colon. These findings suggest that the pathogenic CD4+ α−β+ T cells expressing a homodimeric form of the TCRβ-chains can be clonally expanded upon the stimulation with gut-derived Ags.
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Affiliation(s)
- Ichiro Takahashi
- *Department of Mucosal Immunology, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan; and
| | - Hideki Iijima
- *Department of Mucosal Immunology, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan; and
| | - Rumi Katashima
- †Otsuka Department of Clinical and Molecular Nutrition, School of Medicine, University of Tokushima, Tokushima, Japan
| | - Mitsuo Itakura
- †Otsuka Department of Clinical and Molecular Nutrition, School of Medicine, University of Tokushima, Tokushima, Japan
| | - Hiroshi Kiyono
- *Department of Mucosal Immunology, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan; and
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