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Regulation of NF-kappa B activation in T helper 1 and T helper 2 cells

J A Lederer1, J S Liou, S Kim

  • 1Department of Pathology, Brigham and Women's Hospital, Boston, MA 02115, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|January 1, 1996
PubMed

Insights

T-helper cell subsets Th1 and Th2 exhibit distinct NF-kappa B activation pathways. While Th1 cells show delayed nuclear translocation of p65(RelA) via TCR, Th2 cells fail to translocate p65(RelA) upon TCR stimulation, suggesting differential regulation.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Signaling

Background:

  • Nuclear Factor kappa B (NF-kappa B) is a key transcription factor regulating immune responses.
  • NF-kappa B activation involves the release of its inhibitor, I kappa B, and subsequent nuclear translocation.
  • T-helper (Th) cell differentiation into Th1 and Th2 subsets is crucial for adaptive immunity.

Purpose of the Study:

  • To investigate the differential activation pathways of NF-kappa B in Th1 and Th2 cells.
  • To elucidate the mechanisms underlying the impaired NF-kappa B activation in Th2 cells.
  • To compare TCR- and cytokine-mediated NF-kappa B activation in T cell subsets.

Main Methods:

  • Electrophoretic mobility shift assays (EMSA) to detect NF-kappa B DNA binding.
  • Analysis of cytoplasmic and nuclear protein levels of NF-kappa B subunits (p65(RelA), p50).
  • Assessment of I kappa B alpha expression and modulation by stimuli.

Main Results:

  • Th1 and Th2 cells possess similar cytoplasmic levels of p65(RelA) and p50.
  • TCR stimulation fails to induce nuclear translocation of p65(RelA) in Th2 cells, but IL-1 can induce it.
  • IL-1 and TNF rapidly induce p65(RelA) nuclear translocation in T cell clones, while TCR induction is delayed in Th1 cells.
  • Th1 and Th2 cells differ in I kappa B alpha expression and modulation by cytokines versus TCR stimuli.

Conclusions:

  • TCR and cytokine signaling pathways for NF-kappa B activation are distinct.
  • Th2 cells exhibit a defect in TCR-induced NF-kappa B nuclear translocation, suggesting specific regulatory mechanisms.
  • Differential expression and regulation of I kappa B alpha may contribute to the distinct NF-kappa B activation profiles in Th1 and Th2 cells.

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