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pubmed-article:15630140pubmed:abstractTextThe CD4+ CD25+ regulatory T cells play a critical role in controlling autoimmunity, but little is known about their development and maintenance. In this study, we investigated whether CD4+ CD25- cells can convert to CD4+ CD25+ regulatory T cells in vivo under natural conditions. CD4+ CD25- cells from CD45.1+ mice were sorted and transferred into congenic CD45.2+ mice. Converted CD4+ CD25+ cells could be detected in lymphoid organs as early as 1 wk after transfer and by 6 wk after transfer, 5-12% of transferred CD4+ cells expressed CD25. Converted CD4+ CD25+ cells themselves failed to proliferate after stimulation, but could suppress proliferation of responder cells in vitro, and also expressed high levels of Foxp3 mRNA. In addition, CD4+ CD25- cells transferred into thymectomized congenic mice converted to CD4+ CD25+ cells that also suppressed responder cell proliferation in vitro, and expressed high levels of Foxp3 mRNA. Finally, CD4+ CD25- cells transferred into B7-/- mice failed to convert into CD4+ CD25+ cells that exhibit the regulatory phenotype. These data indicate that CD4+ CD25- cells convert into CD4+ CD25+ regulatory T cells spontaneously in vivo and suggest that this conversion process could contribute significantly to the maintenance of the peripheral CD4+ CD25+ regulatory T cell population.lld:pubmed
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pubmed-article:15630140pubmed:authorpubmed-author:ZhaoYuanYlld:pubmed
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pubmed-article:15630140pubmed:articleTitleConversion of CD4+ CD25- cells into CD4+ CD25+ regulatory T cells in vivo requires B7 costimulation, but not the thymus.lld:pubmed
pubmed-article:15630140pubmed:affiliationDepartment of Microbiology and Immunology, University of Louisville Health Science Center, Louisville, KY 40202, USA.lld:pubmed
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pubmed-article:15630140pubmed:publicationTypeComparative Studylld:pubmed
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