Tetraspanin 8-rictor-integrin α3 complex is required for glioma cell migration.

Tetraspanin 8-rictor-integrin α3 complex is required for glioma cell migration.
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胶质瘤细胞迁移需要四叠蛋白8-核糖蛋白α3复合物。

DOI:
10.3390/ijms16035363
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发表时间:
2015-03-09
影响因子:
5.6
通讯作者:
Sun QF
Sun QF
中科院分区:
生物学2区
文献类型:
--
作者:
Pan SJ;Zhan SK;Pan YX;Liu W;Bian LG;Sun B;Sun QF

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恶性胶质瘤是恶性肿瘤之一,预后极差。胶质瘤细胞的侵袭和迁移是其死亡的主要原因。本研究旨在探讨四跨膜蛋白8(tetraspanin 8,Tspan 8)在恶性胶质瘤中的表达及其可能的功能。我们发现Tspan 8在恶性胶质瘤组织和几种人类胶质瘤细胞系中表达水平很高,它形成了整合素α3和rictor的复合物,后者是哺乳动物雷帕霉素靶蛋白(mTOR)复合物2(mTORC 2)的关键成分。通过siRNA介导的敲除这三种蛋白中的任何一种,破坏这种复合物,抑制了体外U251 MG胶质瘤细胞的迁移。我们进一步表明,Tspan 8-rictor协会似乎需要mTORC 2激活。靶向siRNA对Tspan 8的敲低阻止了U251 MG细胞中mTOR-rictor(mTORC 2)的组装以及AKT(Ser-473)和蛋白激酶C α(PKCα)的磷酸化。总之,这些结果表明恶性胶质瘤中过表达的Tspan 8与rictor和整合素α3形成复合物,以介导mTORC 2活化和胶质瘤细胞迁移。因此,靶向Tspan 8-rictor-integrin α3复合物可能为恶性胶质瘤的治疗提供一种潜在的干预手段。
The malignant glioma remains one of the most aggressive human malignancies with extremely poor prognosis. Glioma cell invasion and migration are the main causes of death. In the current study, we studied the expression and the potential functions of tetraspanin 8 (Tspan8) in malignant gliomas. We found that Tspan8 expression level is high in both malignant glioma tissues and in several human glioma cell lines, where it formed a complex integrin α3 and rictor, the latter is a key component of mammalian target of rapamycin (mTOR) complex 2 (mTORC2). Disruption of this complex, through siRNA-mediated knockdown of anyone of these three proteins, inhibited U251MG glioma cell migration in vitro. We further showed that Tspan8-rictor association appeared required for mTORC2 activation. Knockdown of Tspan8 by the targeted siRNAs prevented mTOR-rictor (mTORC2) assembly as well as phosphorylation of AKT (Ser-473) and protein kinase C α (PKCα) in U251MG cells. Together, these results demonstrate that over-expressed Tspan8 in malignant glioma forms a complex with rictor and integrin α3 to mediate mTORC2 activation and glioma cell migration. Therefore, targeting Tspan8-rictor-integrin α3 complex may provide a potential therapeutic intervention for malignant glioma.
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