Netrin-1 suppresses the MEK/ERK pathway and ITGB4 in pancreatic cancer.

Netrin-1 suppresses the MEK/ERK pathway and ITGB4 in pancreatic cancer.
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Netrin-1在胰腺癌中抑制MEK/ERK途径和ITGB4。

DOI:
10.18632/oncotarget.8348
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发表时间:
2016-04-26
期刊:
影响因子:
--
通讯作者:
Liu D
Liu D
中科院分区:
其他
文献类型:
--
作者:
An XZ;Zhao ZG;Luo YX;Zhang R;Tang XQ;Hao D;Zhao X;Lv X;Liu D

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轴突引导因子netrin-1促进多种类型癌症的肿瘤发生,特别是在其晚期。在这里,我们研究Netrin-1是否参与了胰腺癌的体内生长。我们发现Netrin-1在I/II期胰腺导管腺癌(PDAC)中低表达。在体外二维培养中,过表达netrin-1可以有效地抑制异种移植的PDAC细胞的生长,而不会降低细胞的增殖或增加细胞的凋亡率。整合素-β4(ITGB4)的表达显著降低,并且ITGB4的敲除模拟了netrin-1的肿瘤抑制作用,这意味着ITGB4是netrin-1抑制PDAC的主要靶点。我们进一步证明,netrin-1向Unc5b/FAK发出信号以刺激一氧化氮的产生,从而促进PP2A介导的对MEK/ERK通路的抑制,并减少ITGB4启动子的磷酸化c-jun募集。我们的发现表明,netrin-1可以抑制PDAC的生长,并为这种抑制提供了一种机械性的见解。
The axon guidance factor netrin-1 promotes tumorigenesis in multiple types of cancers, particularly at their advanced stages. Here, we investigate whether netrin-1 is involved in the in vivo growth of pancreatic adenocarcinoma. We show that netrin-1 is significantly under-expressed in stage-I/II pancreatic ductal adenocarcinoma (PDAC). Netrin-1 over-expression effectively arrests the growth of xenografted PDAC cells without decreasing cell proliferation or increasing apoptosis in two-dimensional cultures in vitro. Integrin-beta4 (ITGB4) expression is significantly reduced, and ITGB4-knockdown mimics the tumor-suppressive effect of netrin-1, implying that ITGB4 is a main target of netrin-1 in constraining PDAC. We further show that netrin-1 signals to UNC5B/FAK to stimulate nitric oxide production, which promotes PP2A-mediated inhibition of the MEK/ERK pathway and decreases phosphorylated-c-Jun recruitment to the ITGB4 promoter. Our findings suggest that netrin-1 can suppress the growth of PDAC and provide a mechanistic insight into this suppression.
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