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- W1760219309 abstract "Abstract Oral administration of Ag coupled to cholera toxin B subunit (CTB) efficiently induces peripheral immunological tolerance. We investigated the extent to which this oral tolerance is mediated by CD25+CD4+ regulatory T cells (Treg). We found that total Treg, KJ1–26+ Treg and CTLA-4+ Treg were all increased in Peyer’s patches, mesenteric lymph nodes, and, to a lesser extent, in spleen of mice after intragastric administration of OVA/CTB conjugate, which also increased TGF-β in serum. This could be abolished by coadministering cholera toxin or by treatment with anti-TGF-β mAb. CD25+ Treg, but also CD25−CD4+ T cells from OVA/CTB-treated BALB/c or DO11.10 mice efficiently suppressed effector T cell proliferation and IL-2 production in vitro. Following adoptive transfer, both T cell populations also suppressed OVA-specific T cell and delayed-type hypersensitivity responses in vivo. Foxp3 was strongly expressed by CD25+ Treg from OVA/CTB-treated mice, and treatment also markedly expanded CD25+Foxp3+ Treg. Furthermore, in Rag1−/− mice that had adoptively received highly purified Foxp3−CD25−CD4+ OT-II T cells OVA/CTB feeding efficiently induced CD25+ Treg cells, which expressed Foxp3 more strongly than naturally developing Treg and also had stronger ability to suppress effector OT-II T cell proliferation. A remaining CD25− T cell population, which also became suppressive in response to OVA/CTB treatment, did not express Foxp3. Our results demonstrate that oral tolerance induced by CTB-conjugated Ag is associated with increase in TGF-β and in both the frequency and suppressive capacity of Foxp3+ and CTLA-4+ CD25+ Treg together with the generation of both Foxp3+ and Foxp3−CD25− CD4+ Treg." @default.
- W1760219309 created "2016-06-24" @default.
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- W1760219309 date "2006-12-01" @default.
- W1760219309 modified "2023-10-06" @default.
- W1760219309 title "Oral Tolerance Induction with Antigen Conjugated to Cholera Toxin B Subunit Generates Both Foxp3+CD25+ and Foxp3−CD25− CD4+ Regulatory T Cells" @default.
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- W1760219309 doi "https://doi.org/10.4049/jimmunol.177.11.7634" @default.
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