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KMID : 0578320190420030228
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Molecules and Cells
2019 Volume.42 No. 3 p.228 ~ p.236
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Segmented Filamentous Bacteria Induce Divergent Populations of Antigen-Specific CD4 T Cells in the Small Intestine
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Yi Jae-U
Jung Ji-Sun
Han Dae-Hee
Surh Charles D.
Lee You-Jeong
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Abstract
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CD4 T cells differentiate into RORγt/IL-17A-expressing cells in the small intestine following colonization by segmented filamentous bacteria (SFB). However, it remains unclear whether SFB-specific CD4 T cells can differentiate directly from naive precursors, and whether their effector differentiation is solely directed towards the Th17 lineage. In this study, we used adoptive T cell transfer experiments and showed that naive CD4 T cells can migrate to the small intestinal lamina propria (sLP) and differentiate into effector T cells that synthesize IL-17A in response to SFB colonization. Using single cell RT-PCR analysis, we showed that the progenies of SFB responding T cells are not uniform but composed of transcriptionally divergent populations including Th1, Th17 and follicular helper T cells. We further confirmed this finding using in vitro culture of SFB specific intestinal CD4 T cells in the presence of cognate antigens, which also generated heterogeneous population with similar features. Collectively, these findings indicate that a single species of intestinal bacteria can generate a divergent population of antigen-specific effector CD4 T cells, rather than it provides a cytokine milieu for the development of a particular effector T cell subset.
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KEYWORD
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antigen-specific CD4 T cells, germ-free mice, segmented filamentous bacteria, single cell RT-PCR, small intestine
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