Molecular insights into NF2/Merlin tumor suppressor function.

Molecular insights into NF2/Merlin tumor suppressor function.
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对 NF2/Merlin 肿瘤抑制功能的分子见解。

DOI:
10.1016/j.febslet.2014.04.001
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发表时间:
2014-08-19
期刊:
影响因子:
3.5
通讯作者:
Giancotti FG
Giancotti FG
中科院分区:
生物学3区
文献类型:
--
作者:
Cooper J;Giancotti FG

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由NF2肿瘤抑制基因编码的FERM结构域蛋白Merlin,通过响应粘附信号调节细胞增殖。Merlin的生长抑制功能由细胞间粘附诱导,并通过联合整合素/受体酪氨酸激酶信号通路失活。Merlin有助于极化组织中细胞连接的形成,激活紧密连接处的抗有丝分裂信号,抑制致癌基因的表达。因此,Merlin的失活导致有丝分裂信号和肿瘤发生失控。Merlin的主要抑瘤功能是通过调控Hippo信号传导来控制致癌基因的表达。值得注意的是,Merlin易位到细胞核,直接抑制CRL4DCAF1 E3泛素连接酶,从而抑制Lats激酶的抑制。NF2功能的二分法已经出现,即Merlin作用于细胞皮层组织细胞连接并传播抗有丝分裂信号,而它通过抑制CRL4DCAF1和激活Hippo信号来抑制致癌基因表达。本文将讨论默林蛋白正常功能和肿瘤抑制活性背后的生化事件,重点介绍最近的发现,这些发现对我们对默林蛋白生物学的理解有很大的影响。
The FERM domain protein Merlin, encoded by the NF2 tumor suppressor gene, regulates cell proliferation in response to adhesive signaling. The growth inhibitory function of Merlin is induced by intercellular adhesion and inactivated by joint integrin/receptor tyrosine kinase signaling. Merlin contributes to the formation of cell junctions in polarized tissues, activates anti-mitogenic signaling at tight-junctions, and inhibits oncogenic gene expression. Thus, inactivation of Merlin causes uncontrolled mitogenic signaling and tumorigenesis. Merlin's predominant tumor suppressive functions are attributable to its control of oncogenic gene expression through regulation of Hippo signaling. Notably, Merlin translocates to the nucleus where it directly inhibits the CRL4DCAF1 E3 ubiquitin ligase, thereby suppressing inhibition of the Lats kinases. A dichotomy in NF2 function has emerged whereby Merlin acts at the cell cortex to organize cell junctions and propagate anti-mitogenic signaling, whereas it inhibits oncogenic gene expression through the inhibition of CRL4DCAF1 and activation of Hippo signaling. The biochemical events underlying Merlin's normal function and tumor suppressive activity will be discussed in this Review, with emphasis on recent discoveries that have greatly influenced our understanding of Merlin biology.
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