Ligand-independent activation of MET through IGF-1/IGF-1R signaling.

Ligand-independent activation of MET through IGF-1/IGF-1R signaling.
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DOI:
10.1002/ijc.28169
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发表时间:
2013-10-01
影响因子:
6.4
通讯作者:
Gallick, Gary E.
Gallick, Gary E.
中科院分区:
医学1区
文献类型:
--
作者:
Varkaris, Andreas;Gaur, Sanchaika;Parikh, Nila U.;Song, Jian H.;Dayyani, Farshid;Jin, Jung-Kang;Logothetis, Christopher J.;Gallick, Gary E.

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受体酪氨酸激酶 MET 通过多种机制(包括与表皮生长因子受体的相互作用)参与许多实体瘤的肿瘤发生和转移。在这项研究中,我们研究了胰岛素样生长因子受体-1 (IGF-1R) 信号在 MET 激活中的作用,重点关注前列腺癌细胞。用 IGF-1 刺激前列腺癌细胞系 PC3 会诱导 MET 在多个位点延迟磷酸化(表明完全激活),在添加 IGF-1 后 18 小时达到最大值。 MET 激活不需要唯一的 MET 配体肝细胞生长因子 (HGF),但需要转录发生。此外,在 PC3 异种移植模型中,直接注射 IGF-1 足以诱导体内 MET 激活。酪氨酸激酶 Src 的药理学或遗传抑制可消除 MET 磷酸化,并且在没有 IGF-1 刺激的情况下,激活的 Src 的表达足以诱导 Met 磷酸化。激活的 MET 对于 IGF-1 介导的 PC3 细胞迁移增加至关重要,这表明 IGF 介导的 MET 激活具有重要的生物学效应。最后,我们证明 IGF-1 诱导的延迟 MET 激活发生在表达两种受体的多个细胞系中,这表明当两种生长因子受体都表达时,IGF-1R 介导的 MET 激活可能有助于多种癌症类型的致瘤特性。结果进一步表明 MET 可能被多种受体酪氨酸激酶受体激活,并且这些受体的双重靶向可能在治疗上很重要。
The receptor tyrosine kinase, MET, has been implicated in tumorigenesis and metastasis of many solid tumors, by multiple mechanisms, including cross talk with Epidermal Growth Factor Receptor. In this study, we examined the role of Insulin Like Growth Factor Receptor-1 (IGF-1R) signaling in MET activation, focusing on prostate cancer cells. Stimulation of the prostate cancer cell line PC3 with IGF-1 induces a delayed phosphorylation of MET at multiple sites (indicative of full activation), reaching a maximum 18h after IGF-1 addition. MET activation does not require the sole MET ligand Hepatocyte Growth Factor (HGF), but does require transcription to occur. Furthermore, direct injection of IGF-1 is sufficient to induce MET activation in vivo, in a PC3 xenograft model. Pharmacologic or genetic inhibition of the tyrosine kinase, Src, abolishes MET phosphorylation, and expression of activated Src is sufficient to induce Met phosphorylation in the absence of IGF-1 stimulation. Activated MET is essential for IGF-1-mediated increased migration of PC3 cells, demonstrating an important biologic effect of IGF-mediated MET activation. Finally, we demonstrate that IGF-1 induced delayed MET activation occurs in multiple cell lines which express both the receptors, suggesting that IGF-1R-mediated MET activation may contribute to tumorigenic properties of multiple cancer types when both growth factor receptors are expressed. The results further suggest that MET may be activated by multiple receptor tyrosine kinase receptors, and dual targeting of these receptors may be important therapeutically.
通过中和抗体靶向骨源性胰岛素样生长因子-II,可抑制人骨环境中前列腺癌细胞的生长。
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影响因子: --
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