Hippo-independent activation of YAP by the GNAQ uveal melanoma oncogene through a trio-regulated rho GTPase signaling circuitry.

Hippo-independent activation of YAP by the GNAQ uveal melanoma oncogene through a trio-regulated rho GTPase signaling circuitry.
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DOI:
10.1016/j.ccr.2014.04.016
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发表时间:
2014-06-16
期刊:
影响因子:
50.3
通讯作者:
Gutkind JS
Gutkind JS
中科院分区:
医学1区
文献类型:
--
作者:
Feng X;Degese MS;Iglesias-Bartolome R;Vaque JP;Molinolo AA;Rodrigues M;Zaidi MR;Ksander BR;Merlino G;Sodhi A;Chen Q;Gutkind JS

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在编码异源三聚体Gαq家族成员的GNAQ和GNA 11癌基因中,已分别在约83%和约6%的葡萄膜和皮肤黑色素瘤中鉴定出互斥激活突变。然而,这些GNAQ驱动的恶性肿瘤的分子事件尚未确定,因此限制了开发癌症靶向治疗的能力。在这里,我们专注于转录辅激活因子雅普,这是控制器官大小的Hippo信号通路的关键组成部分。我们发现Gαq通过Trio-Rho/Rac信号通路刺激雅普,促进肌动蛋白聚合,独立于PLCβ和经典Hippo通路。此外,我们发现Gαq促进葡萄膜黑色素瘤细胞的YAP依赖性生长,从而将雅普确定为葡萄膜黑色素瘤的合适治疗靶点,葡萄膜黑色素瘤是第一个描述的GNAQ/GNA 11引发的人类恶性肿瘤。
Mutually exclusive activating mutations in the GNAQ and GNA11 oncogenes, encoding heterotrimeric Gαq family members, have been identified in ~83% and ~6% of uveal and skin melanomas, respectively. However, the molecular events underlying these GNAQ-driven malignancies are not yet defined, thus limiting the ability to develop cancer-targeted therapies. Here, we focused on the transcriptional co-activator YAP, a critical component of the Hippo signaling pathway that controls organ size. We found that Gαq stimulates YAP through a Trio-Rho/Rac signaling circuitry promoting actin polymerization, independently of PLCβ and the canonical Hippo pathway. Furthermore, we show that Gαq promotes the YAP-dependent growth of uveal melanoma cells, thereby identifying YAP as a suitable therapeutic target in uveal melanoma, the first described GNAQ/GNA11-initiated human malignancy.
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