Glypican-3-mediated oncogenesis involves the Insulin-like growth factor-signaling pathway.

Glypican-3-mediated oncogenesis involves the Insulin-like growth factor-signaling pathway.
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DOI:
10.1093/carcin/bgn091
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发表时间:
2008-07
期刊:
影响因子:
4.7
通讯作者:
Lee YM
Lee YM
中科院分区:
医学2区
文献类型:
--
作者:
Cheng W;Tseng CJ;Lin TT;Cheng I;Pan HW;Hsu HC;Lee YM

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磷脂酰肌醇蛋白聚糖-3(gpc 3)是导致Al-Golabi-Behmel过度生长综合征的基因。以前,我们已经证明GPC 3在肝细胞癌(HCC)中过表达。在这项研究中,我们证明了GPC 3介导的肿瘤发生的机制。首先,GPC 3在NIH 3 T3细胞中的过表达导致癌细胞表型包括在无血清培养基中生长和在软琼脂中形成集落,或者相反,GPC 3在HuH-7细胞中的敲低降低了致癌性。我们进一步证明GPC 3通过其N-末端富含脯氨酸的区域特异性结合胰岛素样生长因子(IGF)-II和IGF-1 R。GPC 3以IGF-II依赖的方式刺激IGF-1 R和下游信号分子细胞外信号调节激酶(ERK)的磷酸化。此外,GPC 3在HCC细胞中的敲低降低了IGF-1 R和ERK的磷酸化。因此,GPC 3通过IGF-II与其受体之间的相互作用以及随后的IGF信号通路的激活来赋予致癌性。这些数据对于目前对GPC 3在HCC中的作用的理解是新颖的,并且在癌症治疗的未来发展中将是重要的。
Glypican-3 (gpc3) is the gene responsible for Simpson-Golabi-Behmel overgrowth syndrome. Previously, we have shown that GPC3 is overexpressed in hepatocellular carcinoma (HCC). In this study, we demonstrated the mechanisms for GPC3-mediated oncogenesis. Firstly, GPC3 overexpression in NIH3T3 cells gave to cancer cell phenotypes including growing in serum-free medium and forming colonies in soft agar, or on the other way, GPC3 knockdown in HuH-7 cells decreased oncogenecity. We further demonstrated that GPC3 bound specifically through its N-terminal proline-rich region to both Insulin-like growth factor (IGF)-II and IGF-1R. GPC3 stimulated the phosphorylation of IGF-1R and the downstream signaling molecule extracellular signal-regulated kinase (ERK) in an IGF-II-dependent way. Also, GPC3 knockdown in HCC cells decreased the phosphorylation of both IGF-1R and ERK. Therefore, GPC3 confers oncogenecity through the interaction between IGF-II and its receptor, and the subsequent activation of the IGF-signaling pathway. This data are novel to the current understanding of the role of GPC3 in HCC and will be important in future developments of cancer therapy.
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