Inhibition of MAPK kinase signaling pathways suppressed renal cell carcinoma growth and angiogenesis in vivo

被引:179
|
作者
Huang, Dan [1 ]
Ding, Yan [2 ]
Luo, Wang-Mei [1 ]
Bender, Stephanie [1 ]
Qian, Chao-Nan [1 ,4 ]
Kort, Eric [1 ]
Zhang, Zhong-Fa [1 ]
VandenBeldt, Kristin [3 ]
Duesbery, Nicholas S. [2 ]
Resau, James H. [3 ]
Teh, Bin Tean [1 ,5 ]
机构
[1] Van Andel Res Inst, Canc Genet Lab, Lab Microarray Technol, Grand Rapids, MI 49503 USA
[2] Van Andel Res Inst, Lab Canc & Dev Cell Biol, Lab Microarray Technol, Grand Rapids, MI USA
[3] Van Andel Res Inst, Lab Analyt Cellular & Mol Microscopy, Lab Microarray Technol, Grand Rapids, MI USA
[4] Sun Yat Sen Univ, Ctr Canc, Dept Nasopharyngeal Carcinoma, Guangzhou, Peoples R China
[5] Natl Canc Ctr, NCCS VARI Translat Res Lab, Singapore, Singapore
关键词
D O I
10.1158/0008-5472.CAN-07-5311
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
The mitogen-activated protein kinase (MAPK) signaling pathways play essential roles in cell proliferation and differentiation. Recent studies also show the activation of MAPK signaling pathways in tumorigenesis, metastasis, and angiogenesis of multiple human malignancies, including renal cell carcinoma (RCC). To assess the role of this pathway in regulating the proliferation and survival of RCC cells, we first examined the expression of MAPK kinase (MKK) and MAPK in clear cell RCC and confirmed the overexpression of MKK1 and extracellular signal-regulated kinase 2 (ERK2) in these tumors. We then tested the effects of pharmacologic inhibition of MKK on human RCC cell lines, both in vitro and in vivo, using anthrax lethal toxin (LeTx), which cleaves and inactivates several MKKs. Western blotting showed that the phosphorylation levels of ERK, c-Jun-NH2 kinase, and p38 MAPK decreased after 72 It of LeTx treatment. Exposure to LeTx for 72 It reduced cell proliferation by 20% without significant effects on cell cycle distribution and apoptosis. Anchorage-independent growth of RCC cells was dramatically inhibited by LeTx. In vivo studies showed that tumor growth of RCC xenografts could be suppressed by LeTx. Extensive necrosis and decreased tumor neovascularization were observed after LeTx treatment. LeTx also showed direct inhibition of proliferation of endothelial cells in vitro. Our results suggest that suppression of one or more MAPK signaling pathways may inhibit RCC growth through the disruption of tumor vasculature.
引用
收藏
页码:81 / 88
页数:8
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