A PTP1B-Cdk3 Signaling Axis Promotes Cell Cycle Progression of Human Glioblastoma Cells through an Rb-E2F Dependent Pathway.

A PTP1B-Cdk3 Signaling Axis Promotes Cell Cycle Progression of Human Glioblastoma Cells through an Rb-E2F Dependent Pathway.
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PTP1B-Cdk3 信号轴通过 Rb-E2F 依赖性途径促进人胶质母细胞瘤细胞的细胞周期进展。

DOI:
10.1080/10985549.2023.2273193
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发表时间:
2023
影响因子:
5.3
通讯作者:
Arias-Romero, Luis Enrique
Arias-Romero, Luis Enrique
中科院分区:
生物学2区
文献类型:
--
作者:
Villamar-Cruz, Olga;Loza-Mejia, Marco Antonio;Vivar-Sierra, Alonso;Saldivar-Ceron, Hector Ivan;Patino-Lopez, Genaro;Olguin, Jonadab Efrain;Terrazas, Luis Ignacio;Armas-Lopez, Leonel;Avila-Moreno, Federico;Saha, Sayanti;Chernoff, Jonathan;Camacho-Arroyo, Ignacio;Arias-Romero, Luis Enrique

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PTP1B 在不同类型癌症的发生中发挥着关键作用。然而,这种效应背后的分子机制尚不清楚。为了确定 PTP1B 介导其在肿瘤发生中的作用的分子靶标,我们采用了基于 SILAC 的磷酸蛋白质组学方法,这使我们能够将 Cdk3 识别为新型 PTP1B 底物。底物捕获实验和对接研究揭示了 PTP1B 催化结构域和 Cdk3 之间的稳定相互作用。此外,我们观察到 PTP1B 在体外使 Cdk3 在酪氨酸残基 15 处去磷酸化,并在人胶质母细胞瘤细胞中与其相互作用。接下来,我们发现对 PTP1B 的药理学抑制或用 siRNA 消除它会导致细胞周期停滞,同时 Cdk3 活性降低、Rb 低磷酸化以及 E2F 靶基因 Cdk1、Cyclin A 和 Cyclin E1 下调。最后,我们观察到组成型活性 Cdk3 突变体的表达绕过了 PTP1B 对细胞周期进展和 E2F 靶基因表达的要求。这些数据描绘了人类 GB 细胞中以 Rb-E2F 依赖性方式有效细胞周期进展所需的从 PTP1B 到 Cdk3 的新信号传导途径。
PTP1B plays a key role in developing different types of cancer. However, the molecular mechanism underlying this effect is unclear. To identify molecular targets of PTP1B that mediate its role in tumorigenesis, we undertook a SILAC-based phosphoproteomic approach, which allowed us to identify Cdk3 as a novel PTP1B substrate. Substrate trapping experiments and docking studies revealed stable interactions between the PTP1B catalytic domain and Cdk3. In addition, we observed that PTP1B dephosphorylates Cdk3 at tyrosine residue 15 in vitro and interacts with it in human glioblastoma cells. Next, we found that pharmacological inhibition of PTP1B or its depletion with siRNA leads to cell cycle arrest with diminished activity of Cdk3, hypophosphorylation of Rb, and the downregulation of E2F target genes Cdk1, Cyclin A, and Cyclin E1. Finally, we observed that the expression of a constitutively active Cdk3 mutant bypasses the requirement of PTP1B for cell cycle progression and expression of E2F target genes. These data delineate a novel signaling pathway from PTP1B to Cdk3 required for efficient cell cycle progression in an Rb-E2F dependent manner in human GB cells.
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