Neuroglobin Regulates Wnt/β-Catenin and NFκB Signaling Pathway through Dvl1.

Neuroglobin Regulates Wnt/β-Catenin and NFκB Signaling Pathway through Dvl1.
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神经球蛋白通过 Dvl1 调节 Wnt/β-Catenin 和 NF kappa B 信号通路

DOI:
10.3390/ijms19072133
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发表时间:
2018-07-23
影响因子:
5.6
通讯作者:
Xiang S
Xiang S
中科院分区:
生物学2区
文献类型:
--
作者:
Xun Y;Li Z;Tang Y;Yang M;Long S;Shu P;Li J;Xiao Y;Tang F;Wei C;Liu N;Xiang S

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脑红蛋白是一种内源性神经保护蛋白,但其潜在的神经保护机制尚不清楚。我们前期的酵母双杂交筛选研究表明,Disheveled-1是Wnt/β-catenin信号转导的关键枢纽蛋白,是脑红蛋白的相互作用伙伴。在这项研究中,我们进一步研究了脑红蛋白在调控Disheveled-1及其下游的Wnt/β-catenin和NFκB信号通路中的作用。我们发现,脑红蛋白通过免疫共沉淀直接与Disheveled-1相互作用,并且这两种蛋白共同定位于SK-N-SH细胞的胞浆和胞核。此外,脑红蛋白的异位表达通过蛋白酶体降解途径促进外源性和内源性Disheveled-1的降解。此外,我们的结果显示,脑红蛋白显著抑制SK-N-SH细胞中Topflash报告基因的荧光素酶活性和Dishevelled1介导的β-catenin的表达。此外,我们还发现脑红蛋白通过下调Disheveled-1来增强肿瘤坏死因子-α诱导的核因子κB的激活。四甲基偶氮唑盐比色法结果显示,脑红蛋白是一种重要的神经保护剂,可以保护SK-N-SH细胞免受3-(4,5-Dimethylthiazol-2-Yl)-2,5-Diphenyltetrazolium-α诱导的细胞活力下降。综上所述,这些发现表明,脑红蛋白通过调节Disheveled-1,在Wnt/β-Catenin和NFκB信号通路中发挥重要的调节作用。
Neuroglobin is an endogenous neuroprotective protein, but the underlying neuroprotective mechanisms remain to be elucidated. Our previous yeast two-hybrid screening study identified that Dishevelled-1, a key hub protein of Wnt/β-Catenin signaling, is an interaction partner of Neuroglobin. In this study, we further examined the role of Neuroglobin in regulating Dishevelled-1 and the downstream Wnt/β-Catenin and NFκB signaling pathway. We found that Neuroglobin directly interacts with Dishevelled-1 by co-immunoprecipitation, and the two proteins are co-localized in both cytoplasma and nucleus of SK-N-SH cells. Moreover, the ectopic expression of Neuroglobin promotes the degradation of exogenous and endogenous Dishevelled-1 through the proteasomal degradation pathway. Furthermore, our results showed that Neuroglobin significantly inhibits the luciferase activity of Topflash reporter and the expression of β-Catenin mediated by Dishevelled-1 in SK-N-SH cells. In addition, we also documented that Neuroglobin enhances TNF-α-induced NFκB activation via down-regulating Dishevelled-1. Finally, 3-(4,5-Dimethylthiazol-2-Yl)-2,5-Diphenyltetrazolium Bromide (MTT) assays showed that Neuroglobin is an important neuroprotectant that protects SK-N-SH cells from TNF-α-induced decrease in cell viability. Taken together, these findings demonstrated that Neuroglobin functions as an important modulator of the Wnt/β-Catenin and NFκB signaling pathway through regulating Dishevelled-1.
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