Cyclin-dependent kinase 5 stabilizes hypoxia-inducible factor-1α: a novel approach for inhibiting angiogenesis in hepatocellular carcinoma.

Cyclin-dependent kinase 5 stabilizes hypoxia-inducible factor-1α: a novel approach for inhibiting angiogenesis in hepatocellular carcinoma.
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DOI:
10.18632/oncotarget.8342
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发表时间:
2016-05-10
期刊:
影响因子:
--
通讯作者:
Zahler S
Zahler S
中科院分区:
其他
文献类型:
--
作者:
Herzog J;Ehrlich SM;Pfitzer L;Liebl J;Fröhlich T;Arnold GJ;Mikulits W;Haider C;Vollmar AM;Zahler S

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我们最近引入 CDK5 作为 HCC 的靶标,调节 DNA 损伤反应。基于此以及我们之前关于 CDK5 血管作用的知识,我们研究了 CDK5 在 HCC(血管化程度最高的肿瘤之一)血管生成中的作用。我们特别关注转录因子 HIF-1α,它是肿瘤血管生成的主要调节因子。通过蛋白质印迹、PCR、报告基因测定、免疫组织化学、激酶测定、免疫共沉淀、质谱和突变研究来测试 CDK5 与 HIF-1α 的相互作用。在体内,不同的小鼠 HCC 模型是通过二乙基亚硝胺或皮下注射 HUH7 或 HepG2 细胞诱导的。通过对来自 HCC 患者的肝组织微阵列进行免疫染色来评估血管密度和 CDK5 的相关性。抑制内皮细胞或 HCC 细胞中的 CDK5 可降低体外和体内 HIF-1α 水平以及 HIF-1α 靶基因(VEGFA、VEGFR1、EphrinA1)的转录。质谱分析和定点诱变揭示了 CDK5 对 HIF-1α Ser687 的稳定磷酸化。 CDK5 抑制可降低小鼠 HCC 模型中的血管密度。总之,抑制 CDK5 是一种治疗 HCC 的多模式系统方法,可抑制血管生成以及肿瘤细胞本身。
We recently introduced CDK5 as target in HCC, regulating DNA damage response. Based on this and on our previous knowledge about vascular effects of CDK5, we investigated the role of CDK5 in angiogenesis in HCC, one of the most vascularized tumors. We put a special focus on the transcription factor HIF-1α, a master regulator of tumor angiogenesis. The interaction of CDK5 with HIF-1α was tested by Western blot, PCR, reporter gene assay, immunohistochemistry, kinase assay, co-immunoprecipitation, mass spectrometry, and mutation studies. In vivo, different murine HCC models, were either induced by diethylnitrosamine or subcutaneous injection of HUH7 or HepG2 cells. The correlation of vascular density and CDK5 was assessed by immunostaining of a microarray of liver tissues from HCC patients. Inhibition of CDK5 in endothelial or HCC cells reduced HIF-1α levels in vitro and in vivo, and transcription of HIF-1α target genes (VEGFA, VEGFR1, EphrinA1). Mass spectrometry and site directed mutagenesis revealed a stabilizing phosphorylation of HIF-1α at Ser687 by CDK5. Vascular density was decreased in murine HCC models by CDK5 inhibition. In conclusion, inhibiting CDK5 is a multi-modal systemic approach to treat HCC, hitting angiogenesis, as well as the tumor cells themselves.
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