In:
The Journal of Immunology, The American Association of Immunologists, Vol. 171, No. 4 ( 2003-08-15), p. 1816-1824
Kurzfassung:
NF-κB/Rel transcription factors are linked to innate immune responses and APC activation. Whether and how the induction of NF-κB signaling in normal CD4+ T cells regulates effector function are not well-understood. The liberation of NF-κB dimers from inhibitors of κB (IκBs) constitutes a central checkpoint for physiologic regulation of most forms of NF-κB. To investigate the role of NF-κB induction in effector T cell responses, we targeted inhibition of the NF-κB/Rel pathway specifically to T cells. The Th1 response in vivo is dramatically weakened when T cells defective in their NF-κB induction (referred to as IκBα(ΔN) transgenic cells) are activated by a normal APC population. Analyses in vivo, and IL-12-supplemented T cell cultures in vitro, reveal that the mechanism underlying this T cell-intrinsic requirement for NF-κB involves activation of the IFN-γ gene in addition to clonal expansion efficiency. The role of NF-κB in IFN-γ gene expression includes a modest decrease in Stat4 activation, T box expressed in T cell levels, and differentiation efficiency along with a more prominent postdifferentiation step. Further, induced expression of Bcl-3, a trans-activating IκB-like protein, is decreased in T cells as a consequence of NF-κB inhibition. Together, these findings indicate that NF-κB induction in T cells regulates efficient clonal expansion, Th1 differentiation, and IFN-γ production by Th1 lymphocytes at a control point downstream from differentiation.
Materialart:
Online-Ressource
ISSN:
0022-1767
,
1550-6606
DOI:
10.4049/jimmunol.171.4.1816
Sprache:
Englisch
Verlag:
The American Association of Immunologists
Publikationsdatum:
2003
ZDB Id:
1475085-5
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