Glycogen synthase kinase 3 drives thymocyte egress by suppressing β-catenin activation of Akt.

Glycogen synthase kinase 3 drives thymocyte egress by suppressing β-catenin activation of Akt.
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糖原合成酶激酶 3 通过抑制 Akt 的 β-连环蛋白激活来驱动胸腺细胞流出。

DOI:
10.1126/sciadv.abg6262
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发表时间:
2021-10-08
期刊:
影响因子:
13.6
通讯作者:
Liu WH
Liu WH
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Liu C;Ma L;Wang Y;Zhao J;Chen P;Chen X;Wang Y;Hu Y;Liu Y;Jia X;Yang Z;Yin X;Wu J;Wu S;Zheng H;Ma X;Sun X;He Y;Lin L;Fu Y;Liao K;Zhou X;Jiang S;Fu G;Tang J;Han W;Chen XL;Fan W;Hong Y;Han J;Huang X;Li BA;Xiao N;Xiao C;Fu G;Liu WH

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GSK 3通过抑制β-连环蛋白介导的Akt活化来调节Foxo 1-Klf 2-S1 P1轴,从而控制胸腺细胞的排出。控制成熟胸腺细胞从胸腺向外周迁移的分子途径仍不完全清楚。在这里,我们表明,T细胞特异性消融糖原合成酶激酶3(GSK 3)导致严重受损的胸腺出口。在缺乏GSK 3的情况下,β-连环蛋白在细胞质中积累,在那里它与Akt结合并激活Akt,导致Foxo 1的磷酸化和降解以及Klf 2和S1 P1表达的下调,从而阻止胸腺细胞的迁移。胞质膜定位的β-catenin从细胞核中排除促进Akt激活,表明β-catenin的新功能独立于其作为转录激活因子的作用。此外,β-连环蛋白的基因切除、显性失活Akt突变体的逆转录病毒表达和组成型活性Foxo 1的转基因表达恢复了GSK 3缺陷型胸腺细胞的迁移。我们的研究结果确立了GSK 3在胸腺细胞出口中的重要作用,并揭示了β-连环蛋白在细胞质中的先前未鉴定的信号传导功能。
GSK3 controls thymocyte egress by regulating a Foxo1-Klf2-S1P1 axis through dampening β-catenin–mediated Akt activation. Molecular pathways controlling emigration of mature thymocytes from thymus to the periphery remain incompletely understood. Here, we show that T cell–specific ablation of glycogen synthase kinase 3 (GSK3) led to severely impaired thymic egress. In the absence of GSK3, β-catenin accumulated in the cytoplasm, where it associated with and activated Akt, leading to phosphorylation and degradation of Foxo1 and downregulation of Klf2 and S1P1 expression, thereby preventing emigration of thymocytes. A cytoplasmic membrane-localized β-catenin excluded from the nucleus promoted Akt activation, suggesting a new function of β-catenin independent of its role as a transcriptional activator. Furthermore, genetic ablation of β-catenin, retroviral expression of a dominant negative Akt mutant, and transgenic expression of a constitutively active Foxo1 restored emigration of GSK3-deficient thymocytes. Our findings establish an essential role for GSK3 in thymocyte egress and reveal a previously unidentified signaling function of β-catenin in the cytoplasm.
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