The protein phosphatase activity of PTEN is essential for regulating neural stem cell differentiation.

The protein phosphatase activity of PTEN is essential for regulating neural stem cell differentiation.
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PTEN 的蛋白磷酸酶活性对于调节神经干细胞分化至关重要

DOI:
10.1186/s13041-015-0114-1
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发表时间:
2015-04-18
期刊:
影响因子:
3.6
通讯作者:
Zhou W
Zhou W
中科院分区:
医学3区
文献类型:
--
作者:
Lyu J;Yu X;He L;Cheng T;Zhou J;Cheng C;Chen Z;Cheng G;Qiu Z;Zhou W

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背景肿瘤抑制基因磷酸酶和张力蛋白同源物(Phosphatase and tensin homolog,PTEN)在神经前体细胞(Neural progenitor cells,NPC)中高表达,在中枢神经系统发育中起重要作用。作为一种双特异性磷酸酶,PTEN磷酸酶活性的损失已被链接到各种diseases.ResultsHere我们报告的蛋白磷酸酶活性ofPtenis调节神经前体细胞的分化至关重要。首先,我们发现Pten的缺失促进神经元分化。为了确定蛋白质或脂质磷酸酶活性是否是调节神经元分化所必需的,我们产生了磷酸酶结构域特异性Ptenmutations。有趣的是,只有蛋白磷酸酶缺陷突变体Y138L的表达可以模拟敲低Pten的效果,这表明Pten的蛋白磷酸酶对调节NPC分化至关重要。重要的是,我们发现野生型和脂质磷酸酶突变体(G129E)形式的Pten能够拯救Pten敲除NPC中的神经元分化,但含有蛋白磷酸酶突变体的突变体不能。我们进一步发现,thatPten依赖的CREB的去磷酸化是神经元分化的关键。结论我们的数据表明,蛋白磷酸酶的PTEN活性是至关重要的调节神经干细胞分化过程中的皮质发育。
BackgroundThe tumor suppressor gene Phosphatase and tensin homolog (PTEN) is highly expressed in neural progenitor cells (NPCs) and plays an important role in development of the central nervous system. As a dual-specificity phosphatase, the loss of PTEN phosphatase activity has been linked to various diseases.ResultsHere we report that the protein phosphatase activity ofPtenis critical for regulating differentiation of neural progenitor cells. First we found that deletion ofPtenpromotes neuronal differentiation. To determine whether the protein or lipid phosphatase activity is required for regulating neuronal differentiation, we generated phosphatase domain-specificPtenmutations. Interestingly, only expression of protein phosphatase-deficient mutant Y138L could mimic the effect of knocking downPten, suggesting the protein phosphatase ofPtenis critical for regulating NPC differentiation. Importantly, we showed that the wild-type and lipid phosphatase mutant (G129E) forms ofPtenare able to rescue neuronal differentiation inPtenknockout NPCs, but mutants containing protein phosphatase mutant cannot. We further found thatPten-dependent dephosphorylation of CREB is critical for neuronal differentiation.ConclusionOur data indicate that the protein phosphatase activity of PTEN is critical for regulating differentiation of NSCs during cortical development.
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