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학술저널
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한국미생물생명공학회 Journal of Microbiology and Biotechnology Journal of Microbiology and Biotechnology 제23권 제7호
발행연도
2013.1
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1,023 - 1,030 (8page)

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Lipoteichoic acid (LTA), uniquely expressed on gram-positive bacteria, is recognized by Tolllike receptor 2 (TLR2) on not only antigen-presenting cells but also activated T cells. Therefore,it is reasonable to assume that LTA is acting on T cells. However, little is known about the effect of LTA on T-cell regulation. In the present study, we investigated the immunomodulatory effects of LTA on CD4+ T cells. Effector CD4+ T cells, induced after co-culture with S. aureuspulsed dendritic cells, produced high levels of interferon-γ, CD25, CD69, and TLRs 2 and 4. When effector CD4+ T cells were treated with LTA, the expressions of the membrane-bound form of transforming growth factor (TGF)-β and forkhead box P3 increased. Coincidently, the proliferation of effector CD4+ T cells was declined after LTA treatment. When TGF-β signaling was blocked by the TGF-β receptor 1 kinase inhibitor, LTA failed to suppress the proliferation of effector CD4+ T cells. Therefore, the present results suggest that LTA suppresses the activity of effector CD4+ T cells by enhancing TGF-β production.

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