The Journal of Immunology, Vol 156, Issue 1 56-63, Copyright © 1996 by American Association of Immunologists

ARTICLES

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

JA Lederer, JS Liou, S Kim, N Rice and AH Lichtman
Department of Pathology, Brigham and Women's Hospital, Boston, MA 02115, USA.

In most cell types, NF-kappa B is activated by release from a cytoplasmic inhibitor protein, I kappa B, followed by its translocation to the nucleus where it binds to the regulatory regions of many genes, including the IL-2 gene in T lymphocytes. We have previously shown by electrophoretic mobility shift assays that nuclear extracts prepared from activated, non-IL-2-producing Th2 cell clones. We show here that Th-1 and Th2 cells have similar levels of cytoplasmic p65(RelA) and p50, but TCR stimulation fails to induce the nuclear translocation of p65(RelA) in Th2 cells. Nuclear translocation of p65(RelA) can be induced by IL-1 stimulation of Th2 cells, indicating that a basic mechanism of NF-Kappa B activation common to many cells is intact in Th2 cells. We demonstrate that IL-1 and TNF induce rapid nuclear translocation of p65(RelA) in T cell clones, whereas TCR-induced NF- Kappa B activation in Th1 cells is delayed and may be longer in duration. This suggests that the TCR pathway of NF-Kappa B activation is different from the cytokine pathway. Furthermore, we show that Th1 and Th2 cells express different levels and/or different forms of I kappa B alpha, and that cytokines, but not TCR stimuli, significantly modulate detectable levels of cytoplasmic I kappa B alpha.

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