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Two functional subsets of FOXP3+ regulatory T cells in human thymus and periphery.

ABSTRACT: Previous studies suggest that thymus produces a homogenous population of natural regulatory T (Treg) cells that express a transcriptional factor FOXP3 and control autoimmunity through a cell-contact-dependent mechanism. We found two subsets of FOXP3+ natural Treg cells defined by the expression of the costimulatory molecule ICOS in the human thymus and periphery. Whereas the ICOS+FOXP3+ Treg cells used interleukin-10 to suppress dendritic cell function and transforming growth factor (TGF)-beta to suppress T cell function, the ICOS-FOXP3+ Treg cells used TGF-beta only. The survival and proliferation of the two subsets of Treg cells were differentially regulated by signaling through ICOS or CD28, respectively. We suggest that the selection of natural Treg cells in thymus is coupled with Treg cell differentiation into two subsets imprinted with different cytokine expression potentials and use both cell-contact-dependent and independent mechanisms for immunosuppression in periphery.

SUBMITTER: Ito T

PROVIDER: S-EPMC2709453 | biostudies-literature | 2008 Jun

REPOSITORIES: biostudies-literature

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Two functional subsets of FOXP3+ regulatory T cells in human thymus and periphery.

Ito Tomoki T Hanabuchi Shino S Wang Yi-Hong YH Park Woong Ryeon WR Arima Kazuhiko K Bover Laura L Qin F Xiao-Feng FX Gilliet Michel M Liu Yong-Jun YJ

Immunity 20080529 6

Previous studies suggest that thymus produces a homogenous population of natural regulatory T (Treg) cells that express a transcriptional factor FOXP3 and control autoimmunity through a cell-contact-dependent mechanism. We found two subsets of FOXP3+ natural Treg cells defined by the expression of the costimulatory molecule ICOS in the human thymus and periphery. Whereas the ICOS+FOXP3+ Treg cells used interleukin-10 to suppress dendritic cell function and transforming growth factor (TGF)-beta t ...[more]

PMID: 18513999

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Project description:Foxp3 reporter mice including DEREG (DEpletion of REGulatory T cells) mice have greatly helped in exploring the biology of Foxp3(+) Tregs. DEREG mice express a DTR-eGFP fusion protein under the control of a bacterial artificial chromosome (BAC)-encoded Foxp3 promoter, allowing the viable isolation and inducible depletion of Foxp3(+) Tregs. Adaptive Tregs differentiated in vitro to express Foxp3 (iTregs) are gaining high interest as potential therapeutics for inflammatory conditions such as autoimmunity, allergy and transplant rejection. However, selective isolation of Foxp3(+) iTregs with a stable phenotype still remains to be a problem, especially in the human setting. While screening for culture conditions to generate stable CD4(+)Foxp3(+) iTregs from DEREG mice, with maximum suppressive activity, we observed an unexpected dichotomy of eGFP and Foxp3 expression which is not seen in ex vivo isolated cells from DEREG mice. Further characterization of eGFP(+)Foxp3(-) cells revealed relatively lower CD25 expression and a lack of suppressive activity in vitro. Similarly, eGFP(-) cells isolated from the same cultures were not suppressive despite of a broad CD25 expression reflecting mere T cell activation. In contrast, eGFP(+)Foxp3(+) iTregs exhibited potent suppressive activity comparable to that of natural eGFP(+)Foxp3(+) Tregs, emphasizing the importance of isolating Foxp3 expressing iTregs. Interestingly, the use of plate-bound anti-CD3 and anti-CD28 or Flt3L-driven BMDC resulted in considerable resolution of the observed dichotomy. In summary, we defined culture conditions for efficient generation of eGFP(+)Foxp3(+) iTregs by use of DEREG mice. Isolation of functional Foxp3(+) iTregs using DEREG mice can also be achieved under sub-optimal conditions based on the magnitude of surface CD25 expression, in synergy with transgene encoded eGFP. Besides, the reported phenomenon may be of general interest for exploring Foxp3 gene regulation, given that Foxp3 and eGFP expression are driven from distinct Foxp3 loci and because this dichotomy preferentially occurs only under defined in vitro conditions.

Dataset Information

Two functional subsets of FOXP3+ regulatory T cells in human thymus and periphery.

Publications

Two functional subsets of FOXP3+ regulatory T cells in human thymus and periphery.

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