Glycogen synthase kinase 3β inhibition promotes human iTreg differentiation and suppressive function

Area of Science:

• Immunology
• Cellular Biology
• Molecular Medicine

Background:

• Induced regulatory T cells (iTregs) are crucial for maintaining immune tolerance and preventing autoimmunity.
• The role of glycogen synthase kinase 3 beta (GSK3β) in iTreg differentiation is controversial.
• Understanding GSK3β's precise function is vital for developing new immunotherapies.

Purpose of the Study:

• To investigate the role of GSK3β activity in human iTreg differentiation.
• To determine if modulating GSK3β activity affects iTreg development and function.
• To explore the molecular pathways involved in GSK3β-mediated iTreg regulation.

Main Methods:

• Utilized human naive CD4(+) T cells for in vitro differentiation studies.
• Assessed GSK3β activity by measuring phosphorylation at serine 9.
• Employed specific GSK3β inhibitors (SB216763, TDZD-8) and GSK3β overexpression.
• Investigated downstream signaling pathways including MAPK, PI3-kinase/Akt, and TGF-β/Smad3.

Main Results:

• GSK3β activity decreased during iTreg differentiation, indicated by increased phosphorylation at serine 9.
• Inhibition of GSK3β significantly promoted iTreg differentiation and enhanced their suppressive capacity.
• Overexpression of GSK3β markedly inhibited iTreg development.
• GSK3β inhibition enhanced iTreg differentiation via the TGF-β/Smad3 pathway.

Conclusions:

• GSK3β activity negatively regulates human iTreg differentiation.
• Inhibiting GSK3β enhances iTreg development and function.
• Targeting GSK3β represents a promising immunotherapeutic strategy for conditions requiring enhanced immune tolerance.