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
Miyamoto S
中科院分区:
医学1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

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核因子κ B(NF-κB)抑制剂α(IκBα)的N端核输出序列(内斯)可促进NF-κB从细胞核输出到细胞质,但这种输出调节的生理作用尚不清楚。在这里,我们报告的衍生和分析的遗传靶向小鼠窝藏IκBα内斯的种系突变。突变小鼠中的成熟B细胞显示含有NF-κB家族成员cRel的失活IκBα复合物的核蓄积,导致其与细胞质IκB激酶空间分离。这导致B细胞中组成型和经典NF-κB活性、p100和RelB NF-κB成员的合成、非经典NF-κB活性、NF-κB靶基因诱导以及增殖和存活反应严重降低。因此,小鼠表现出B细胞成熟、抗体产生和次级淋巴器官和组织形成缺陷。因此,IκBα核输出对于维持体内成熟B细胞中组成型、经典和非经典NF-κB活化潜能是必不可少的。
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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