Loss of NDRG2 expression activates PI3K-AKT signalling via PTEN phosphorylation in ATLL and other cancers.

Loss of NDRG2 expression activates PI3K-AKT signalling via PTEN phosphorylation in ATLL and other cancers.
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在 ATLL 和其他癌症中,NDRG2 表达缺失会通过 PTEN 磷酸化激活 PI3K-AKT 信号传导。

DOI:
10.1038/ncomms4393
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发表时间:
2014-02-26
影响因子:
16.6
通讯作者:
Morishita, Kazuhiro
Morishita, Kazuhiro
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Nakahata, Shingo;Ichikawa, Tomonaga;Maneesaay, Phudit;Saito, Yusuke;Nagai, Kentaro;Tamura, Tomohiro;Manachai, Nawin;Yamakawa, Norio;Hamasaki, Makoto;Kitabayashi, Issay;Arai, Yasuhito;Kanai, Yae;Taki, Tomohiko;Abe, Takaya;Kiyonari, Hiroshi;Shimoda, Kazuya;Ohshima, Koichi;Horii, Akira;Shima, Hiroshi;Taniwaki, Masafumi;Yamaguchi, Ryoji;Morishita, Kazuhiro

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组成型磷脂酰肌醇 3-激酶 (PI3K)-AKT 激活在成人 T 细胞白血病淋巴瘤 (ATLL) 和其他癌症中具有因果作用。 ATLL 细胞的 PTEN 和 PI3KCA 不存在遗传改变,但表达高水平的 PTEN,且其 C 末端尾部高度磷酸化。在此,我们报告了一种 N-myc 下游调节基因 2 (NDRG2) 依赖性调节 PTEN 磷酸酶活性的机制,该机制是通过 C 端尾部 Ser380、Thr382 和 Thr383 簇上 PTEN 的去磷酸化来实现的。我们发现 NDRG2 是一种 PTEN 结合蛋白,可将蛋白磷酸酶 2A (PP2A) 招募到 PTEN 上。 ATLL 中 NDRG2 的表达经常下调,导致 PTEN Ser380/Thr382/Thr383 簇磷酸化增强,并增强 PI3K-AKT 通路的激活。鉴于 NDRG2 缺陷小鼠中 T 细胞淋巴瘤和其他癌症的高发病率,通过增强 PTEN 磷酸化激活 PI3K-AKT 可能对于癌症的发展至关重要。 包含肿瘤抑制因子 PTEN 的 PI3K 通路有助于成人 T 细胞白血病淋巴瘤 (ATLL) 的肿瘤发生。在这项研究中,Nakahata 等人。显示 PTEN 被 NDRG2 去磷酸化,ATLL 中 NDGR2 的缺失导致 PI3K 通路的激活。
Constitutive phosphatidylinositol 3-kinase (PI3K)-AKT activation has a causal role in adult T-cell leukaemia-lymphoma (ATLL) and other cancers. ATLL cells do not harbour genetic alterations in PTEN and PI3KCA but express high levels of PTEN that is highly phosphorylated at its C-terminal tail. Here we report a mechanism for the N-myc downstream-regulated gene 2 (NDRG2)-dependent regulation of PTEN phosphatase activity via the dephosphorylation of PTEN at the Ser380, Thr382 and Thr383 cluster within the C-terminal tail. We show that NDRG2 is a PTEN-binding protein that recruits protein phosphatase 2A (PP2A) to PTEN. The expression of NDRG2 is frequently downregulated in ATLL, resulting in enhanced phosphorylation of PTEN at the Ser380/Thr382/Thr383 cluster and enhanced activation of the PI3K-AKT pathway. Given the high incidence of T-cell lymphoma and other cancers in NDRG2-deficient mice, PI3K-AKT activation via enhanced PTEN phosphorylation may be critical for the development of cancer. The PI3K pathway that encompasses the tumour suppressor PTEN contributes to tumourigenesis in adult T-cell leukaemia-lymphoma (ATLL). In this study, Nakahata et al. show that PTEN is dephosphorylated by NDRG2, and that loss of NDGR2 in ATLL results in the activation of the PI3K pathway.
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