PI3K induces B-cell development and regulates B cell identity.

PI3K induces B-cell development and regulates B cell identity.
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PI3K诱导B细胞发育并调节B细胞身份。

DOI:
10.1038/s41598-018-19460-5
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发表时间:
2018-01-22
期刊:
影响因子:
4.6
通讯作者:
Jumaa H
Jumaa H
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Abdelrasoul H;Werner M;Setz CS;Okkenhaug K;Jumaa H

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磷酸肌醇-3激酶(PI 3 K)信号传导对于许多细胞类型的存活是重要的,并且PI 3 K的IA类是B细胞发育而不是T细胞发育所特别需要的。在这里,我们表明,IA类PI 3 K介导的信号诱导的转录因子Pax 5的表达,发挥了核心作用,在B细胞的承诺和分化,通过激活中央B细胞特异性信号蛋白,如SLP-65和CD 19的表达。IA类PI 3 K功能缺陷导致Pax 5表达减少,并阻止B细胞发育超过表达前体B细胞受体(前BCR)的阶段。研究PI 3 K诱导的Pax 5表达的机制表明,它涉及一个转录因子网络,包括FoxO 1和Irf 4,直接结合到Pax 5基因。总之,我们的研究结果表明,PI 3 K信号转导与发育中的B细胞的存活和分化与B细胞身份有关,并且前B细胞中PI 3 K活性的降低导致Pax 5表达和谱系可塑性的降低。
Phosphoinositide-3 kinase (PI3K) signaling is important for the survival of numerous cell types and class IA of PI3K is specifically required for the development of B cells but not for T cell development. Here, we show that class IA PI3K-mediated signals induce the expression of the transcription factor Pax5, which plays a central role in B cell commitment and differentiation by activating the expression of central B cell-specific signaling proteins such as SLP-65 and CD19. Defective class IA PI3K function leads to reduction in Pax5 expression and prevents B cell development beyond the stage expressing the precursor B cell receptor (pre-BCR). Investigating the mechanism of PI3K-induced Pax5 expression revealed that it involves a network of transcription factors including FoxO1 and Irf4 that directly binds to the Pax5 gene. Together, our results suggest that PI3K signaling links survival and differentiation of developing B cells with B cell identity and that decreased PI3K activity in pre-B cells results in reduced Pax5 expression and lineage plasticity.
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