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PLoS One. 2013 Jul 3;8(7):e67821. doi: 10.1371/journal.pone.0067821. Print 2013.

In vitro induction of regulatory CD4+CD8α+ T cells by TGF-β, IL-7 and IFN-γ.

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Department of Pathology, Microbiology and Immunology, Vanderbilt University School of Medicine, Nashville, Tennessee, United States of America.


In vitro CD4(+) T cell differentiation systems have made important contributions to understanding the mechanisms underlying the differentiation of naive CD4(+) T cells into effector cells with distinct biological functions. Mature CD4(+) T cells expressing CD8αα homodimers are primarily found in the intestinal mucosa of men and mice, and to a lesser extent in other tissues such as peripheral blood. Although CD4(+)CD8α(+) T cells are easily identified, very little is known about their development and immunological functions. It has been reported, however, that CD4(+)CD8α(+) T cells possess regulatory properties. In this report, we present a novel in vitro differentiation system where CD4(+) T cells are stimulated to become CD4(+)CD8α(+) T cells in the presence of TGF-β, IL-7 and IFN-γ, resulting in cells with very similar features as CD4(+)CD8α(+) intraepithelial lymphocytes. This novel in vitro differentiation culture should provide a powerful and tractable tool for dissecting the differentiation and biological functions of CD4(+)CD8α(+) T cells.

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