CD4(+)CD62L(+) central memory T cells can be converted to Foxp3(+) T cells

Area of Science:

• Immunology
• Cell Biology

Background:

• The peripheral regulatory T cell (Treg) pool comprises naturally arising Tregs (nTregs) and adaptive Tregs (iTregs).
• Naive CD4(+) T cells convert to iTregs in vitro, while memory CD4(+) T cells are resistant to this conversion.

Purpose of the Study:

• Investigate the induction of Foxp3(+) T cells from diverse human CD4(+) T-cell subsets.
• Identify novel sources for adaptive Tregs (iTregs).

Main Methods:

• In vitro differentiation of human CD4(+) T-cell subsets using TGF-β and IL-2.
• Analysis of Foxp3(+) T-cell markers, including CD45RO.
• Functional assays for T-cell suppression.
• Epigenetic analysis (methylation patterns) of FOXP3 locus.

Main Results:

• Naive CD4(+) T cells converted to Foxp3(+) T cells lacked memory markers (CD45RO).
• CD4(+)CD62L(+) central memory T cells differentiated into Foxp3(+) T cells upon TGF-β induction.
• Induced Tregs from human central memory T cells showed limited suppressive function and similar epigenetic patterns to naive-derived Tregs.
• Induced Tregs from mouse central memory T cells exhibited suppressive functions.

Conclusions:

• CD4(+)CD62L(+) central memory T cells are a potential source for inducing adaptive Tregs (iTregs).
• Further research is needed to fully characterize the suppressive capacity and epigenetic regulation of human iTregs derived from central memory T cells.