The DUSP26 phosphatase activator adenylate kinase 2 regulates FADD phosphorylation and cell growth.

The DUSP26 phosphatase activator adenylate kinase 2 regulates FADD phosphorylation and cell growth.
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DOI:
10.1038/ncomms4351
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发表时间:
2014
影响因子:
16.6
通讯作者:
Jung, Yong-Keun
Jung, Yong-Keun
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Kim, Hyunjoo;Lee, Ho-June;Oh, Yumin;Choi, Seon-Guk;Hong, Se-Hoon;Kim, Hyo-Jin;Lee, Song-Yi;Choi, Ji-Woo;Hwang, Deog Su;Kim, Key-Sun;Kim, Hyo-Joon;Zhang, Jianke;Youn, Hyun-Jo;Noh, Dong-Young;Jung, Yong-Keun

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腺苷酸激酶2(AK2)是一种多功能蛋白质,它负责平衡腺嘌呤核苷酸库。在这里,我们显示AK2负向调节肿瘤细胞的生长。AK2与双特异性磷酸酶26(DUSP26)磷酸酶形成复合体,并独立于其AK活性刺激DUSP26活性。AK2/DUSP26磷酸酶蛋白复合体通过死亡结构域(FADD)使Fas相关蛋白去磷酸化,并调节细胞生长。在异种移植实验中,AK2缺乏促进细胞增殖和诱导肿瘤形成。AK2的这种抗生长功能与其刺激DUSP26的活性有关。AK2的下调经常出现在肿瘤细胞和高水平磷酸化FADDSer194的人类癌症组织中。此外,在AK2缺陷的肿瘤细胞中重建AK2会减缓细胞的增殖和肿瘤的发生。与此一致的是,Ak2+/−小鼠胚胎成纤维细胞表现出促进细胞增殖的能力,并显著改变了磷酸化FADDSer191。这些结果表明,AK2是DUSP26的相关激活剂,并通过FADD去磷酸化抑制细胞增殖,推测AK2是肿瘤生长的负调控因子。腺苷酸激酶2可与FADD结合。在这项研究中,Kim等人。结果表明,腺苷酸激酶2是一种肿瘤抑制因子,与磷酸酶DUSP6相互作用,进而调节FADD的磷酸化。
Adenylate kinase 2 (AK2), which balances adenine nucleotide pool, is a multi-functional protein. Here we show that AK2 negatively regulates tumour cell growth. AK2 forms a complex with dual-specificity phosphatase 26 (DUSP26) phosphatase and stimulates DUSP26 activity independently of its AK activity. AK2/DUSP26 phosphatase protein complex dephosphorylates fas-associated protein with death domain (FADD) and regulates cell growth. AK2 deficiency enhances cell proliferation and induces tumour formation in a xenograft assay. This anti-growth function of AK2 is associated with its DUSP26-stimulating activity. Downregulation of AK2 is frequently found in tumour cells and human cancer tissues showing high levels of phospho-FADDSer194. Moreover, reconstitution of AK2 in AK2-deficient tumour cells retards both cell proliferation and tumourigenesis. Consistent with this, AK2+/− mouse embryo fibroblasts exhibit enhanced cell proliferation with a significant alteration in phospho-FADDSer191. These results suggest that AK2 is an associated activator of DUSP26 and suppresses cell proliferation by FADD dephosphorylation, postulating AK2 as a negative regulator of tumour growth. Adenylate kinase 2 can bind to FADD. In this study, Kim et al. show that adenylate kinase 2 is a tumour suppressor and interacts with the phosphatase DUSP6, and this in turn regulates the phosphorylation of FADD.
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