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Distinct Roles of Phosphoinositide-3 Kinase and Phospholipase Cγ2 in B-Cell Receptor-Mediated Signal Transduction

机译:Phosphoinositide-3激酶和磷脂酶Cγ2在B细胞受体介导的信号转导中的不同作用

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摘要

During B-cell receptor (BCR) signaling, phosphoinositide-3 kinase (PI3K) is thought to function upstream of phospholipase Cγ2 (PLCγ2). PLCγ2 deficiency specifically impedes transitional type 2 (T2) to follicular (FO) mature B-cell transition. Here, we demonstrate that PI3K deficiency specifically impaired T2-to-FO mature B-cell transition and marginal zone B-cell development. Furthermore, we investigated the functional relationship between PI3K and PLCγ2 using PI3K−/−, PLCγ2−/−, and PI3K−/− PLCγ2−/− B cells. Interestingly, PLCγ2 deficiency had no effect on BCR-mediated PI3K activation, whereas PI3K deficiency only partially blocked activation of PLCγ2. Moreover, whereas PI3K−/− PLCγ2−/− double deficiency did not affect hematopoiesis, it resulted in embryonic lethality. PI3K−/− PLCγ2−/− fetal liver cells transplanted into B-cell null JAK3−/− mice failed to restore development of peripheral B cells and failed to progress through early B-cell development at the pro-B- to pre-B-cell transition, a more severe phenotype than was observed with either PI3K or PLCγ2 single-deficiency B cells. Consistent with this finding, BCR signaling was more severely impaired in the absence of both PI3K and PLCγ2 genes than in the absence of either one alone. Taken together, these results demonstrate that whereas PI3K functions upstream of PLCγ2, activation of PLCγ2 can occur independently of PI3K and that PI3K and PLCγ2 also have distinct functions in BCR signal transduction.
机译:在B细胞受体(BCR)信号传导过程中,磷脂酰肌醇3激酶(PI3K)被认为在磷脂酶Cγ2(PLCγ2)的上游起作用。 PLCγ2缺乏症特别阻碍了过渡型2(T2)到滤泡(FO)成熟B细胞的过渡。在这里,我们证明PI3K缺乏会特别损害T2-FO的成熟B细胞过渡和边缘区B细胞发育。此外,我们使用PI3K-/-,PLCγ2-/-和PI3K-/-PLCγ2-/-B细胞研究了PI3K和PLCγ2之间的功能关系。有趣的是,PLCγ2缺乏对BCR介导的PI3K激活没有影响,而PI3K缺乏仅部分阻止了PLCγ2的激活。而且,尽管PI3K-/-PLCγ2-/-双重缺陷不影响造血作用,但它导致了胚胎致死性。 PI3K-/-PLCγ2-//胎肝细胞移植到B细胞无效的JAK3-/-小鼠中,未能恢复周围B细胞的发育,并且无法从pro-B-到pre-B的早期B细胞发育进展-细胞过渡,比PI3K或PLCγ2单缺陷B细胞观察到的更为严重的表型。与此发现一致,与PI3K和PLCγ2基因都不存在相比,在没有PI3K和PLCγ2基因的情况下,BCR信号传导受到的损害更大。综上所述,这些结果表明,尽管PI3K在PLCγ2的上游起作用,但PLCγ2的激活可以独立于PI3K发生,并且PI3K和PLCγ2在BCR信号转导中也具有独特的功能。

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