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The kinases MEKK2 and MEKK3 regulate transforming growth factor-β-mediated helper T cell differentiation

Xing Chang1, Fang Liu, Xiaofang Wang

  • 1Department of Immunobiology and Program in Vascular Biology and Therapeutics, Yale University School of Medicine, New Haven, CT 06519, USA.

Immunity
|February 22, 2011
PubMed

Insights

Mitogen-activated protein kinases (MAPKs) regulate T helper cell differentiation. MEKK2 and MEKK3 kinases negatively control transforming growth factor-β (TGF-β) signaling, impacting regulatory T and Th17 cell development.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Mitogen-activated protein kinases (MAPKs) are crucial for T cell receptor (TCR) signaling.
  • The specific roles of MAPKs in T helper (Th) cell differentiation remain incompletely understood.

Purpose of the Study:

  • To investigate the function of MAPK kinase kinases MEKK2 and MEKK3 in TGF-β-mediated Th cell differentiation.
  • To elucidate the molecular mechanisms by which these kinases regulate Th cell fate.

Main Methods:

  • Utilized Map3k2(-/-)Map3k3(Lck-Cre/-) mice and in vitro differentiation assays.
  • Analyzed T cell populations, including regulatory T (Treg) and Th17 cells.
  • Assessed the phosphorylation status of SMAD2 and SMAD3 proteins.

Main Results:

  • Map3k2(-/-)Map3k3(Lck-Cre/-) mice exhibited aberrant accumulation of Treg and Th17 cells.
  • Naive CD4(+) T cells from these mice differentiated into Treg and Th17 cells more readily upon TGF-β stimulation.
  • These mice showed exacerbated experimental autoimmune encephalomyelitis, linked to impaired SMAD2/3 phosphorylation.

Conclusions:

  • MEKK2 and MEKK3 negatively regulate TGF-β-driven Th cell differentiation.
  • The interplay between TCR-induced MAPK and TGF-β signaling is critical for controlling Th cell differentiation.
  • Dysregulation of this pathway contributes to autoimmune conditions.

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