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In Vitro Differentiation of Human CD4+FOXP3+ Induced Regulatory T Cells (iTregs) from Naïve CD4+ T Cells Using a TGF-β-containing Protocol
Published on: December 30, 2016
Insulin Receptor Substrate 1 Signaling Inhibits Foxp3 Expression and Suppressive Functions in Treg Cells through the
Woo Ho Lee1, Ga Eul Kim1, Kyung Jin Hong1
1Department of Life Science, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, Republic of Korea.
Insulin receptor substrate 1 (IRS1) negatively regulates regulatory T (Treg) cells. Overexpressing IRS1 in Treg cells impairs their stability, immunosuppressive function, and ability to maintain immune homeostasis.
Area of Science:
- Immunology
- Cell Biology
Background:
- Regulatory T (Treg) cells are crucial for maintaining immune homeostasis.
- The stability and immunosuppressive function of Treg cells are vital for preventing autoimmunity.
Purpose of the Study:
- To investigate the role of insulin receptor substrate 1 (IRS1) in Treg cell function and stability.
- To elucidate the molecular mechanisms by which IRS1 affects Treg cells.
Main Methods:
- Comparative analysis of IRS1 expression in Treg cells versus conventional CD4 T cells.
- Overexpression of IRS1 in Treg cells.
- In vitro suppression assays.
- Transfer-induced colitis model in mice.
- Analysis of key Treg markers (FOXP3, CD25, CTLA4) and signaling pathways (mTORC1).
Main Results:
- IRS1 expression is lower in Treg cells than in conventional CD4 T cells.
- IRS1 overexpression downregulates FOXP3, CD25, and CTLA4 expression in Treg cells.
- IRS1-overexpressing Treg cells exhibit reduced immunosuppressive capacity in vitro and in vivo.
- IRS1 activates the mTORC1 pathway, a known negative regulator of Treg cells.
- IRS1 upregulates IFN-γ and Glut1, destabilizing Treg cells.
Conclusions:
- IRS1 acts as a negative regulator of Treg cells.
- IRS1 disrupts Treg cell stability and function by downregulating FOXP3 and activating the mTORC1 pathway.
- Targeting IRS1 may offer therapeutic potential for immune-related diseases.
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