Nuclear export of the NF-κB inhibitor IκBα is required for proper B cell and secondary lymphoid tissue formation.
Nuclear export of the NF-κB inhibitor IκBα is required for proper B cell and secondary lymphoid tissue formation.
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DOI:
10.1016/j.immuni.2011.01.014
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发表时间:
2011-02-25
期刊:
影响因子:
32.4
通讯作者:
Miyamoto S
中科院分区:
文献类型:
--
作者:
Wuerzberger-Davis SM;Chen Y;Yang DT;Kearns JD;Bates PW;Lynch C;Ladell NC;Yu M;Podd A;Zeng H;Huang TT;Wen R;Hoffmann A;Wang D;Miyamoto S
The N-terminal nuclear export sequence (NES) of inhibitor of nuclear factor kappa B (NF-κB) alpha (IκBα) promotes NF-κB export from the cell nucleus to the cytoplasm, but the physiological role of this export regulation remains unknown. Here we report the derivation and analysis of genetically targeted mice harboring a germline mutation in IκBα NES. Mature B cells in the mutant mice displayed nuclear accumulation of inactive IκBα complexes containing a NF-κB family member, cRel, causing their spatial separation from the cytoplasmic IκB kinase. This resulted in severe reductions in constitutive and canonical NF-κB activities, synthesis of p100 and RelB NF-κB members, noncanonical NF-κB activity, NF-κB target gene induction, and proliferation and survival responses in B cells. Consequently, mice displayed defective B cell maturation, antibody production, and formation of secondary lymphoid organs and tissues. Thus, IκBα nuclear export is essential to maintain constitutive, canonical, and noncanonical NF-κB activation potentials in mature B cells in vivo.
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