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Related Experiment Video

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Author Spotlight: Achieving High-Purity In Vitro Differentiation of Th17 Cells Using Cytokine Concentration Modulation
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Phosphatase PP2A is essential for TH17 differentiation.

Qin Xu1,2, Xuexiao Jin1,2,3, Mingzhu Zheng1,2

  • 1Institute of Immunology, and Department of Dermatology and Rheumatology in Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou 310058, P. R. China.

Proceedings of the National Academy of Sciences of the United States of America
|December 30, 2018
PubMed
Summary

Protein phosphatase 2A (PP2A) is crucial for T helper 17 (TH17) cell differentiation and inflammation. Inhibiting PP2A reduces TH17 cells, offering a potential therapy for autoimmune diseases.

Keywords:
EAEPP2ASMAD2/SMAD3TGFβTH17

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Phosphatase PP2A expression correlates with systemic lupus erythematosus (SLE) severity and IL17A overproduction.
  • PP2A may control TH17 differentiation and inflammation.

Purpose of the Study:

  • To investigate the role of PP2A in TH17 cell differentiation and autoimmune disease.
  • To explore PP2A inhibition as a therapeutic strategy.

Main Methods:

  • Generated a mouse model with PP2A catalytic subunit α ablated in T cells (PP2A cKO).
  • Assessed TH17 cell numbers and disease severity in an experimental autoimmune encephalomyelitis (EAE) model.
  • Analyzed SMAD2/3 phosphorylation and RORγt activity.
  • Tested PP2A inhibitors in vitro and in vivo.

Main Results:

  • PP2A cKO mice exhibited reduced TH17 cells and milder EAE.
  • PP2A deficiency altered SMAD2/3 phosphorylation, decreasing IL17A transcription via RORγt regulation.
  • PP2A inhibitors mimicked these effects, reducing TH17 differentiation and EAE severity.

Conclusions:

  • PP2A is essential for TH17 cell differentiation.
  • PP2A inhibition represents a potential therapeutic approach for TH17-driven autoimmune diseases.