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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
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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

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Pak2 is essential for the function of Foxp3+ regulatory T cells through maintaining a suppressive Treg phenotype

Kyle L O'Hagan1, Stephen D Miller1, Hyewon Phee2,3

  • 1Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611, USA.

Scientific Reports
|December 8, 2017
PubMed

Insights

p21-activated kinase 2 (Pak2) is crucial for maintaining regulatory T cell (Treg) stability and function. Loss of Pak2 causes Tregs to lose Foxp3 expression and suppressive abilities, potentially leading to aberrant immune responses.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Regulatory T cells (Tregs) are vital for immune homeostasis.
  • Foxp3 transcription factor was believed to irreversibly define Treg identity.
  • Recent studies indicate Tregs can lose Foxp3 and de-differentiate.

Purpose of the Study:

  • To investigate the role of p21-activated kinase 2 (Pak2) in Treg stability and function.
  • To determine the consequences of Pak2 deficiency in Tregs.

Main Methods:

  • Conditional knockout of Pak2 in Tregs.
  • Analysis of Treg markers (Foxp3, CD25, Nrp-1, CTLA-4) expression.
  • Assessment of Treg suppressive function in vitro and in vivo.
  • Evaluation of cytokine production and transcription factor expression (Gata3).

Main Results:

  • Pak2 deficiency in Tregs led to reduced expression of Foxp3, CD25, Nrp-1, and CTLA-4.
  • Pak2-deficient Tregs exhibited impaired suppressive function both in vitro and in vivo.
  • Loss of Pak2 induced a Th2-like phenotype in Tregs, characterized by Gata3 expression and Th2 cytokine production.

Conclusions:

  • Pak2 is essential for maintaining Treg stability and suppressive phenotype.
  • Pak2 guards against aberrant immune responses by preserving Foxp3+ Treg identity.
  • Pak2 plays a critical role in regulating immune homeostasis through Treg function.

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