Overexpression of miR‑145 in U87 cells reduces glioma cell malignant phenotype and promotes survival after in vivo implantation.

Overexpression of miR‑145 in U87 cells reduces glioma cell malignant phenotype and promotes survival after in vivo implantation.
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DOI:
10.3892/ijo.2014.2807
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发表时间:
2015-03
影响因子:
5.2
通讯作者:
Jiang F
Jiang F
中科院分区:
医学2区
文献类型:
--
作者:
Lu Y;Chopp M;Zheng X;Katakowski M;Wang D;Fraser E;Nguyen M;Jiang F

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在本研究中,我们试图阐明 miR-145 对神经胶质瘤细胞进展的影响及其作用机制。我们检测了 miR-145 对 U87 神经胶质瘤细胞增殖和侵袭以及毛细管形成的影响。我们的数据表明,U87 神经胶质瘤细胞中 miR-145 的恢复显着减少了其体外增殖、侵袭和血管生成。然而,miR-145表达减少促进U87胶质瘤细胞增殖、侵袭和血管生成,并且miR-145表达减少增加U87细胞中ADAM17和EGFR表达。 miR-145 的过度表达降低了 ADAM17 和 EGFR 的表达。 U87 细胞中 VEGF 分泌和 VEGF 表达因 miR-145 表达增加而减少,并在体外通过 miR-145 下调而逆转。与对照组相比,脑内植入 U87 过表达 miR-145 细胞的裸鼠表现出显着减少的肿瘤生长并提高了存活率。综上所述,这些结果表明 miR-145 作为肿瘤抑制因子的作用,在体外抑制神经胶质瘤细胞增殖、侵袭和血管生成,并在体内减少神经胶质瘤生长。
In the present study, we sought to elucidate the effect of miR-145 on glioma cell progression and its mechanisms of action. We examined the effects of miR-145 on proliferation and invasion of U87 glioma cells and on capillary tube formation. Our data show that restoration of miR-145 in U87 glioma cells significantly reduced their in vitro proliferation, invasion and angiogenesis. However, decreased miR-145 expression promoted U87 glioma cell proliferation, invasion and angiogenesis, and reduced-expression of miR-145 increased ADAM17 and EGFR expression in U87 cells. Overexpression of miR-145 reduced ADAM17 and EGFR expression. VEGF secretion and VEGF expression were decreased by increased miR-145 expression in U87 cells and were reversed by miR-145 down-regulation in vitro. Nude mice with intracerebral implantation of U87 overexpressing miR-145 cells exhibited significantly reduced tumor growth and promoted survival compared with control groups. Taken together, these results suggest a role for miR-145 as a tumor suppressor which inhibits glioma cell proliferation, invasion and angiogenesis in vitro and reduces glioma growth in vivo.
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