IkappaB kinase alpha is essential for mature B cell development and function.

IkappaB kinase alpha is essential for mature B cell development and function.
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DOI:
10.1084/jem.193.4.417
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发表时间:
2001-02-19
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Akira S
Akira S
中科院分区:
其他
文献类型:
--
作者:
Kaisho T;Takeda K;Tsujimura T;Kawai T;Nomura F;Terada N;Akira S

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IκB激酶(IKK)α和β使IκB蛋白磷酸化,并激活转录因子核因子(NF)-κB。尽管两者都是高度同源的激酶,但基因打靶实验揭示了它们在体内的不同作用。IKKα参与皮肤和肢体的形态发生,而IKKβ对细胞因子信号传导至关重要。为了阐明IKKα在造血细胞中的体内作用,我们通过移植对照和IKKα缺陷的胎肝细胞构建了骨髓嵌合体。在IKKα - / -嵌合体中,成熟B细胞群减少。IKKα - / -嵌合体还表现出血清免疫球蛋白基础水平降低以及抗原特异性免疫反应受损。从组织学上看,它们还显示出生发中心形成和依赖成熟B细胞的脾脏微结构的显著破坏。IKKα - / - B细胞不仅在体外表现出生存和有丝分裂反应受损,伴随NF - κB活性降低(尽管可诱导),而且在体内周转率增加。此外,bcl - 2转基因表达只能部分挽救IKKα - / -嵌合体中受损的B细胞发育。综上所述,这些结果表明IKKα在预防成熟B细胞的死亡和功能发育中起关键作用。
IκB kinase (IKK) α and β phosphorylate IκB proteins and activate the transcription factor, nuclear factor (NF)-κB. Although both are highly homologous kinases, gene targeting experiments revealed their differential roles in vivo. IKKα is involved in skin and limb morphogenesis, whereas IKKβ is essential for cytokine signaling. To elucidate in vivo roles of IKKα in hematopoietic cells, we have generated bone marrow chimeras by transferring control and IKKα-deficient fetal liver cells. The mature B cell population was decreased in IKKα−/− chimeras. IKKα−/− chimeras also exhibited a decrease of serum immunoglobulin basal level and impaired antigen-specific immune responses. Histologically, they also manifested marked disruption of germinal center formation and splenic microarchitectures that depend on mature B cells. IKKα−/− B cells not only showed impairment of survival and mitogenic responses in vitro, accompanied by decreased, although inducible, NF-κB activity, but also increased turnover rate in vivo. In addition, transgene expression of bcl-2 could only partially rescue impaired B cell development in IKKα−/− chimeras. Taken together, these results demonstrate that IKKα is critically involved in the prevention of cell death and functional development of mature B cells.
Bruton的酪氨酸激酶将B细胞受体与核因子Kappab激活联系起来。
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