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首页> 外文期刊>Biochimica et biophysica acta. Molecular basis of disease: BBA >Wip1 directly dephosphorylates NLK and increases Wnt activity during germ cell development
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Wip1 directly dephosphorylates NLK and increases Wnt activity during germ cell development

机译:WIP1直接去磷酸化NLK并增加生殖细胞开发期间的WNT活性

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Mice null for wild-type p53-induced phosphatase 1 (WIP1) display defects in testis development and spermatogenesis, resulting in reduced fertility. However, the molecular mechanism underlying these abnormalities in the testis remains uncharacterized. We report that the phosphatase activity of WIP1 increases Wnt activity through Nemo-like kinase (NLK). WIP1 directly interacted with NLK, which is highly homologous to p38 MAPK, a WIP1 substrate, and dephosphorylated its activation site. The WIP1-mediated inhibition of NLK activity markedly decreased the phosphorylation of lymphoid enhancer-binding factor 1 (LEF1), enhancing its interaction with beta-catenin. Additionally, WIP1 depletion impaired germ cell development, as evidenced by the expression of Oct4 and the germ cell-specific markers Ddx4, Nanos3 and Dndl during the development of germ cells from Oct4-GFP transgenic (OG2) mouse embryonic stem cells (mESCs). The expression of WIP1, whose level was significantly lower after the differentiation of germ cells from mESCs, occurred in parallel with the expression of germ cell development markers and SRY-box 17 (Soxl 7), a downstream target of Wnt. These results indicate that WIP1 is essential for germ cell development, which is known to require Wnt activity. (C) 2017 Elsevier B.V. All rights reserved.
机译:野生型P53诱导的磷酸酶1(WIP1)的小鼠无效,睾丸发育和精子发生的缺陷,导致生育率降低。然而,睾丸中这些异常的分子机制仍然保持不协调。我们认为WIP1的磷酸酶活性通过NemO样激酶(NLK)增加了WNT活性。 WIP1直接与NLK相互作用,NLK对P38 MAPK,WIP1基材和可去磷酸化的其活化部位具有高度同源。 WIP1介导的NLK活性的抑制显着降低了淋巴增强剂结合因子1(LEF1)的磷酸化,增强其与β-连环蛋白的相互作用。另外,WIP1耗竭受损的生殖细胞发育,如Oct4和胚芽细胞特异性标记物DDX4,纳米3和DNDL在Oct4-GFP转基因(OG2)小鼠胚胎干细胞(MESCS)的发育过程中所证明的。 WIP1的表达,其水平在MESC的生殖细胞分化后显着降低,与生殖细胞显影标记物和Sry-Box 17(SOX17)的表达并联,Wnt的下游靶标平行。这些结果表明WIP1对于胚芽细胞开发至关重要,已知需要WNT活性。 (c)2017 Elsevier B.v.保留所有权利。

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