Plexin-B2 promotes invasive growth of malignant glioma.

Plexin-B2 promotes invasive growth of malignant glioma.
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DOI:
10.18632/oncotarget.3421
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发表时间:
2015-03-30
期刊:
影响因子:
--
通讯作者:
Friedel RH
Friedel RH
中科院分区:
其他
文献类型:
--
作者:
Le AP;Huang Y;Pingle SC;Kesari S;Wang H;Yong RL;Zou H;Friedel RH

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侵袭性生长是恶性胶质瘤高致死率的主要决定因素。神经丛蛋白-B2是一种轴突导向受体,在发育过程中介导神经祖细胞迁移,在胶质瘤中上调,但其功能仍知之甚少。结合患者样本的生物信息学分析、免疫印迹和免疫组织化学,我们证明丛蛋白-B2在所有类型的人脑胶质瘤中一致上调,并且其表达水平与胶质瘤分级和较差的生存率相关。胶质母细胞瘤细胞中Sema 4C配体激活丛蛋白-B2诱导基于肌动蛋白的细胞骨架动力学和体外侵袭性迁移这种促侵袭作用与细胞运动介质RhoA和Rac 1的激活有关。此外,丛蛋白-B2和受体酪氨酸激酶Met的共刺激导致协同Met磷酸化。在颅内胶质母细胞瘤移植中,丛蛋白-B2敲低阻碍了侵袭性生长和血管周围扩散,并导致肿瘤血管分布减少。我们的研究结果表明,丛蛋白-B2促进胶质瘤的侵袭和血管化,他们确定丛蛋白-B2作为胶质瘤恶性肿瘤的潜在的新的预后标志物。靶向丛蛋白-B2通路可能代表了一种新的治疗方法,以减少胶质母细胞瘤的侵袭性生长。
Invasive growth is a major determinant of the high lethality of malignant gliomas. Plexin-B2, an axon guidance receptor important for mediating neural progenitor cell migration during development, is upregulated in gliomas, but its function therein remains poorly understood. Combining bioinformatic analyses, immunoblotting and immunohistochemistry of patient samples, we demonstrate that Plexin-B2 is consistently upregulated in all types of human gliomas and that its expression levels correlate with glioma grade and poor survival. Activation of Plexin-B2 by Sema4C ligand in glioblastoma cells induced actin-based cytoskeletal dynamics and invasive migration in vitro. This proinvasive effect was associated with activation of the cell motility mediators RhoA and Rac1. Furthermore, costimulation of Plexin-B2 and the receptor tyrosine kinase Met led to synergistic Met phosphorylation. In intracranial glioblastoma transplants, Plexin-B2 knockdown hindered invasive growth and perivascular spreading, and resulted in decreased tumor vascularity. Our results demonstrate that Plexin-B2 promotes glioma invasion and vascularization, and they identify Plexin-B2 as a potential novel prognostic marker for glioma malignancy. Targeting the Plexin-B2 pathway may represent a novel therapeutic approach to curtail invasive growth of glioblastoma.
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